Bose Stereo Amplifier DXA2120 User Guide page
FreeSpace® DXA2120 DigitalMixer/Amplifier  
Owner’s Guide  
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Safety Information  
Please read this owner’s guide  
Please take the time to follow the instructions in this owner’s guide carefully. It will help you set up and operate  
your system properly and enjoy all of its advanced features. Please save this owner’s guide for future reference.  
WARNING: To reduce the risk of fire or electrical shock, do not expose the product to rain or moisture.  
WARNING: The apparatus shall not be exposed to dripping or splashing, and objects filled with liquids, such as vases,  
shall not be placed on the apparatus. As with any electronic products, use care not to spill liquids into any part of the  
system. Liquids can cause a failure and/or a fire hazard.  
The lightning flash with arrowhead symbol within an equilateral triangle alerts the user to the presence of  
uninsulated, dangerous voltage within the system enclosure that may be of sufficient magnitude to  
constitute a risk of electrical shock.  
The exclamation point within an equilateral triangle, as marked on the system, is intended to alert the  
user to the presence of important operating and maintenance instructions in this owner’s guide.  
WARNING: No naked flame sources, such as lighted candles, should be placed on the apparatus.  
CAUTION: Make no modification to the system or accessories. Unauthorized alterations may compromise safety,  
regulatory compliance, and system performance.  
CAUTION: This product shall be connected to a mains socket outlet with a protective earthing connection.  
This product conforms to the EMC Directive 89/336/EEC and to the Low Voltage  
Directive 73/23/EEC. The complete Declaration of Conformity can be found on  
www.Bose.com/static/compliance/index.html.  
Note: Where the mains plug or appliance coupler is used as the disconnect device, such disconnect device shall  
remain readily operable.  
Note: The product must be used indoors. It is neither designed nor tested for use outdoors, in recreation vehicles, or  
on boats.  
Note: Provide an earth connection before the main plug is connected to the mains.  
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Safety Information  
15. To prevent risk of fire or electric shock, avoid overloading wall  
Important safety instructions  
outlets, extension cords, or integral convenience receptacles.  
1. Read these instructions.  
16. Do not let objects or liquids enter the product – as they may  
touch dangerous voltage points or short-out parts that could result  
in a fire or electric shock.  
2. Keep these instructions – for future reference.  
3. Heed all warnings – on the product and in the owner’s guide.  
4. Follow all instructions.  
17. See product enclosure for safety related markings.  
5. Do not use this apparatus near water or moisture.  
6. Clean only with a dry cloth.  
18. No naked flame sources, such as lighted candles, should be  
placed on the apparatus.  
7. Do not block any ventilation openings. Install in accordance  
with the manufacturer’s instructions – To ensure reliable opera-  
tion of the product and to protect it from overheating, put the prod-  
uct in a position and location that will not interfere with its proper  
ventilation.  
8. Do not install near any heat sources, such as radiators, heat  
registers, stoves, or other apparatus (including amplifiers) that  
produce heat.  
9. Do not defeat the safety purpose of the polarized or grounding-  
type plug. A polarized plug has two blades with one wider than  
the other. A grounding-type plug has two blades and a third  
grounding prong. The wider blade or third prong are provided  
for your safety. If the provided plug does not fit in your outlet,  
consult an electrician for replacement of the obsolete outlet.  
10. Protect the power cord from being walked on or pinched, par-  
ticularly at plugs, convenience receptacles, and the point where  
they exit from the apparatus.  
Information about products that generate  
electrical noise  
If applicable, this equipment has been tested and found to com-  
ply with the limits for a Class A digital device, pursuant to Part 15  
of the FCC rules. These limits are designed to provide reasonable  
protection against harmful interference in a residential installa-  
tion. This equipment generates, uses, and can radiate radio fre-  
quency energy and, if not installed and used in accordance with  
the instructions, may cause harmful interference to radio commu-  
nications. However, this is no guarantee that interference will not  
occur in a particular installation. If this equipment does cause  
harmful interference to radio or television reception, which can be  
determined by turning the equipment off and on, you are encour-  
aged to try to correct the interference by one or more of the fol-  
lowing measures:  
11. Only use attachments/accessories specified by the  
manufacturer.  
• Reorient or relocate the receiving antenna.  
12. Use only with the cart, stand, tripod, bracket, or  
table specified by the manufacturer or sold with  
the apparatus. When a cart is used, use caution  
when moving the cart/apparatus combination to  
avoid injury from tip-over.  
• Increase the separation between the equipment and receiver.  
• Connect the equipment to an outlet on a different circuit than  
the one to which the receiver is connected.  
13. Unplug this apparatus during lightning storms or  
when unused for long periods of time – to prevent  
damage to this product.  
• Consult the dealer or an experienced radio/TV technician for  
help.  
Note: Unauthorized modification of this product could void the  
user’s authority to operate this equipment.  
14. Refer all servicing to qualified service personnel. Servicing is  
required when the apparatus has been damaged in any way  
such as power-supply cord or plug is damaged; liquid has been  
spilled or objects have fallen into the apparatus; the apparatus  
has been exposed to rain or moisture, does not operate nor-  
mally, or has been dropped – Do not attempt to service this prod-  
uct yourself. Opening or removing covers may expose you to  
dangerous voltages or other hazards. Please call Bose to be referred  
to an authorized service center near you.  
This product complies with the Canadian ICES-003 Class A  
specifications.  
The information furnished in this user’s guide does not include  
all of the details of design, production, or variations of the equip-  
ment. Nor does it cover every possible situation which may arise  
during installation, operation, or maintenance.  
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Contents  
4.7 System wiring ..................................................... 12  
1.0 Introduction ..............................................5  
4.7.1 LINE 1-4 source inputs .............................. 12  
4.7.1.1 RCA connections .......................... 12  
4.7.1.2 Euroblock connections .................. 13  
4.7.2 DIRECT source input ................................. 13  
4.7.3 PAGE source input .................................... 14  
4.7.4 OUTPUT connections ............................... 14  
4.7.5 AUX output connection ............................. 15  
1.1 The Bose® FreeSpace® DXA 2120  
Digital Mixer/Amplifier ...........................................5  
1.2 Supplied with the product ....................................5  
1.3 Mixer/Amplifier accessories .................................5  
2.0 Hardware Description ..............................6  
4.8 AC POWER connection ..................................... 15  
4.8.1 Input voltage setting (120 or 220-240V) .... 15  
4.8.2 Fuse type ................................................... 15  
4.8.3 AC POWER connection ............................. 15  
2.1 Front panel with open compartment ....................6  
2.1.1 System Controls ..........................................6  
2.1.2 Control Compartment ..................................6  
2.1.3 Input Controls ..............................................6  
4.9 DC POWER connection ..................................... 15  
5.0 System Setup ..........................................16  
5.1 System setup introduction ................................. 16  
2.2 Front panel with compartment closed ..................6  
2.3 Rear panel ............................................................7  
2.3.1 Audio source inputs .....................................7  
2.3.2 Outputs ........................................................7  
2.3.3 Control input ................................................7  
2.3.4 Power ...........................................................7  
2.3.5 Communication ...........................................7  
5.2 System setup procedure .................................... 16  
5.2.1 Selecting an operation mode .................... 16  
5.2.2 Setting the options for that mode ............. 16  
5.3 Mixer Mode settings .......................................... 17  
5.4 Stereo Select Mode settings .............................. 22  
5.5 Dual Mono Select Mode settings ....................... 26  
5.6 Overview of Utility Mode settings ...................... 30  
3.0 Operation Mode Options .........................8  
3.1 Operation mode options .......................................8  
3.1.1 Mixer Mode ..................................................8  
3.1.2 Stereo Select Mode .....................................9  
3.1.3 Dual Mono Select Mode ..............................9  
6.0 User Interfaces ........................................31  
4.0 Hardware Installation .............................10  
6.1 User interface use .............................................. 31  
6.1.1 Mode user interface requirements ............ 31  
6.1.1.1 Mixer Mode user interface  
4.1 Introduction ........................................................10  
4.2 Included accessories ..........................................10  
4.3 Placement guidelines .........................................10  
4.4 Shelf mounting the chassis ................................10  
4.5 Rack mounting the chassis ................................10  
application ................................................. 31  
6.1.1.2 Stereo Select Mode  
user interface application .......................... 31  
6.1.1.3 Dual Mono Select Mode  
user interface application .......................... 31  
4.6 User interface (accessory) ..................................11  
4.6.1 User interface installation ..........................11  
4.6.1.1 Additional equipment  
7.0 Troubleshooting Table ...........................32  
7.1 Technical assistance .......................................... 32  
8.0 Reference ................................................33  
8.1 Factory Default Settings ..................................... 33  
required (not supplied) ...............................11  
4.6.1.2 Assembly .......................................11  
4.6.1.3 Recommended cable lengths ........11  
4.6.1.4 User interface connections ............11  
4.6.1.5 User interface wiring ......................12  
4.6.1.6 Detailed schematics of  
user interfaces ...........................................12  
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1.0 Introduction  
1.1 The Bose® FreeSpace® DXA 2120  
Digital Mixer/Amplifier  
1.2 Supplied with the product  
Included connectors:  
• 3-terminal input connectors: (4) for wiring source equipment  
to the four Mic/Line input Euroblock jacks.  
• 4-terminal input connectors: (2) for wiring to the Page and  
Direct input jacks.  
• 6-terminal input connector: (1) for wiring user interfaces to  
the Remote input jack.  
The Bose® FreeSpace® DXA 2120 Digital Mixer/Amplifier  
integrates digital signal processing with two powered output  
channels. Designed as a mixer or router for business music  
applications, it features an LCD panel and controls behind the  
front cover for easy access.  
• 5-terminal output connectors: (2) for wiring to the loud-  
speakers.  
• 3-terminal output connector: (1) for wiring to the AUX output  
jack.  
The mixer/amplifier provides six inputs, including four Mic/Line  
inputs, one Page input, and one Direct input. The Direct input  
overrides all sources playing on the output channels. Each Mic/  
Line input provides both RCA and Euroblock jacks.  
Included placement aids:  
• Non-skid rubber feet: (4) for stable placement on a solid, level  
surface.  
Two output channels are wired for 120 watts at 4 ohms each. For  
70/100 volt applications, a jumper is required for proper configu-  
ration. In 70/100V applications, the two outputs will operate at  
100 watts per channel. A third output is available for an auxiliary  
line out.  
• Rack ears: (2) with mounting hardware for installation in a  
rack.  
1.3 Mixer/Amplifier accessories  
Application-specific Bose accessories:  
Additional features include:  
• Bose® Volume Control User Interface  
A user interface with a volume control knob that fits into a  
standard U.S. double-gang junction box.  
• Signal Mixing: In Mixer Mode, simultaneously combines up to  
four inputs for any of the three outputs.  
• Signal Routing: In Dual Mono Select Mode, one or two inputs  
go to each of two outputs in different zones and can be  
remotely selected. In Stereo Select Mode, two stereo sources  
go to one output zone and can be remotely selected.  
• Bose® Volume Control with A/B Select User Interface  
A user interface that fits into a standard U.S. double-gang  
junction box. It features volume control and A/B select knobs  
for remote source selection.  
• Opti-voice® Paging: Provides a smooth transition between  
music and page signals.  
• Dynamic Equalization: Maintains tonal balance at all listening  
levels.  
• Bose Loudspeaker EQs: Provide equalization for Bose  
loudspeakers.  
• AGC (Automatic Gain Control): When enabled, automatically  
compensates for low-level sources (i.e., microphone with low  
sensitivity).  
• Room Equalization: Allows easy adjustment of tonal balance  
in each zone.  
• Communications Port: Includes an RS-232 serial port  
reserved for system updates.  
• Backup power: Provides an input terminal for a +24V DC  
backup power source.  
5 of 36  
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2.0 Hardware Description  
2.1 Front panel with open compartment  
1
2
3
4
9
10  
5
7
6
8
6
GAIN knobs – Adjusts gain for OUTPUT 1, OUTPUT 2, and  
PAGE.  
2.1.1 System Controls  
1
2
3
4
5
LCD panel – Displays menu selections for configuring and  
viewing system settings.  
7
BASS and TREBLE knobs – Adjusts tonal balance for  
OUTPUT 1 and OUTPUT 2.  
Directional buttons – Navigates system menus and setting  
options shown on the LCD.  
2.1.2 Control Compartment  
8
SELECT button – Confirms selections and settings in the  
system menus.  
Enclosure door – Conceals system controls.  
POWER LED – Blue light indicates the system is on. No  
light when unit is off.  
2.1.3 Input Controls  
9
SIGNAL and CLIP LEDs – Shows signal states for  
Inputs 1-4.  
SIGNAL and CLIP LEDs – Shows signal states for  
OUTPUT 1, OUTPUT 2, PAGE, and DIRECT.  
Signal Unlit = No signal  
Clip Unlit = No clipping  
Clip Red = Clipping  
Signal Unlit = No signal  
Clip Unlit = No clipping  
Clip Red = Clipping  
Signal Green = Signal present  
Signal Green = Signal present  
10 Gain knobs – Adjusts gain for INPUT 1- INPUT 4.  
2.2 Front panel with compartment closed  
1
2
1
Door – Provides access to system controls.  
2
Power status window – Reveals Power LED.  
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2.0 Hardware Description  
2.3 Rear panel  
2
4
6
1
3
5
7
8
9
10  
11  
13  
12  
14  
2.3.1 Audio source inputs  
2.3.4 Power  
1
2
3
LINE INPUTS – Two unbalanced RCA audio jacks per input  
(summed to mono).  
9
BACKUP POWER – For connection to backup power  
source.  
MIC/LINE INPUTS – Balanced Euroblock input jacks. One  
per input.  
10 POWER OFF/ON – AC power switch.  
11 FUSE – 120V T6.3AL/250V or 220-240V T3.15AL/250V.  
12 AC mains line cord jack – AC line voltage input.  
MIC/LINE switch – Adjusts for the proper signal level being  
used with the four Euroblock input connectors.  
13 120V/220-240V switch – Switches between 120V and  
220-240V AC input voltage. This switch is not provided on  
100V AC input voltage models.  
(Mic connections require using the Euroblock input jacks.)  
4
5
DIRECT INPUT – Balanced override input jack.  
PAGE INPUT – Balanced audio input jack.  
2.3.5 Communication  
14 COM – RS-232 serial port is reserved for system updates.  
2.3.2 Outputs  
6
AUX OUTPUT – Line-level signal output for other amplified  
equipment.  
7
OUTPUTS 1 and 2 – Speaker connections for two powered  
outputs (70V, 100V, or 4 ohms operation).  
2.3.3 Control input  
8
REMOTE – Input jack for volume-only control and volume  
control with A/B select user interfaces.  
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3.0 Operation Mode Options  
3.1.1 Mixer Mode  
3.1 Operation mode options  
Line-level sources can be connected using the RCA jacks or  
Euroblock connectors. The system sums the two RCA jacks for  
each input to mono.  
Before making connections, decide how you want the sound  
sources distributed throughout the site. This depends on whether  
the area is specified for one or two zones, the kind of coverage  
needed, and the sources to be used.  
Microphones must be connected using the Euroblock connec-  
tors. Make sure the MIC/LINE switch is set to MIC.  
The mixer/amplifier provides three different modes of operation.  
• Mixer Mode  
In Mixer Mode, the system can mix up to four mic/line inputs to  
each of the two output channels for use in one or two zones.  
• Stereo Select Mode  
In Stereo Select Mode, with up to two stereo sources  
connected and using both output channels, the system  
provides stereo sound to a single output zone. Refer to “Stereo  
Select Mode” on page 9.  
Mixer mode sources can be routed to either or both outputs, as  
shown below.  
• Dual Mono Select Mode  
In Dual Mono Select Mode, with up to two input sources  
connected to each of the two output channels, the system  
provides audio in two zones. Refer to “Dual Mono Select  
Mode” on page 9.  
Sources can be independently routed to the auxiliary output.  
In normal operation, the OUTPUT 1 and 2 gain controls are used  
to control the gains of OUTPUT 1 and 2, respectively. In this  
mode, you have the MASTERVOL LINKED option, which allows  
you to configure the OUTPUT 1 gain control to control the gains  
of OUTPUT 1 and 2 simultaneously.  
Note: With use of a user interface, the chassis output gain knob is  
disabled.  
Use of one or two volume control user interfaces is optional. For  
further detail, see “Mode user interface requirements” on  
page 31.  
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3.0 Operation Mode Options  
3.1.2 Stereo Select Mode  
3.1.3 Dual Mono Select Mode  
Line-level sources can be connected using RCA jacks or  
Euroblock connectors. To connect a stereo source to RCA jacks,  
use either the left or right RCA jack of each INPUT.  
Line-level sources can be connected using RCA jacks or  
Euroblock connectors. The system sums the two RCA jacks for  
each input to mono.  
Dual Mono Select Mode source routing is fixed, as shown below.  
Auxiliary output can be set up to track Output 1 or constant audio  
from Input 1.  
This mode supports the use of one user interface for each output  
channel using a volume control with A/B select user interface.  
Stereo Select Mode source routing is fixed, as shown below.  
Note: With use of a user interface, the chassis output gain knob is  
disabled.  
For further detail, see “Mode user interface requirements” on  
page 31.  
Auxiliary output can be set up to:  
• Play constant audio from Inputs 1 + 2 (summed to mono),  
Source 1.  
• Play constant audio from Inputs 3 + 4 (summed to mono),  
Source 2.  
• Track source selected using A/B select on user interface.  
This mode supports the use of one user interface in a single zone  
using the volume control with A/B select user interface.  
Note: With use of a user interface, the chassis output gain knob is  
disabled.  
For further detail, see “Mode user interface requirements” on  
page 31.  
9 of 36  
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4.0 Hardware Installation  
CAUTION: Do not allow the chassis to exceed the maximum  
4.1 Introduction  
operating temperature of 50° C (122° F). Be aware of conditions in  
an enclosed rack that may increase the temperature above room-  
ambient conditions.  
This section provides instructions for installing and wiring the  
Bose FreeSpace® DXA 2120 Digital Mixer/Amplifier.  
4.4 Shelf mounting the chassis  
4.2 Included accessories  
• 3-terminal input connectors (4) – For wiring  
equipment to the MIC/LINE INPUT Euroblock  
jacks.  
The Bose® FreeSpace® DXA 2120 Digital Mixer/Amplifier has  
rubber feet for use when positioning the chassis on a shelf or  
counter top. They help to protect the surface that supports the  
unit and to prevent chassis movement. Be sure to follow the  
“Placement guidelines” previously described when choosing a  
location for the unit.  
• 4-terminal input connectors (2) – For wiring  
equipment to the single PAGE INPUT and  
single DIRECT INPUT jacks.  
1. Place the mixer/amplifier upside-down on a solid, level  
surface on a protective covering to avoid scratching the  
top of the chassis.  
• 6-terminal input connector (1) – For wiring  
to the REMOTE jack.  
2. Insert the supplied rubber feet to the four existing holes on  
the bottom of the chassis. Use a screwdriver to push the  
locking pins fully into the chassis, securing the feet.  
• 5-terminal output connectors (2) with  
screw caps – For wiring speakers to  
OUTPUT 1 and OUTPUT 2.  
Note: The rubber feet may be removed by inserting a screwdriver into  
the screw and turning counterclockwise until the screw backs out of the  
hole.  
4.5 Rack-mounting the chassis  
The chassis requires two 1.75" (4.4 cm) rack-space units with a  
16" (40.6 cm) inside depth (including the rear supports).  
• 3-terminal output connector (1) – For wiring to  
the AUX OUTPUT jack.  
1. Use the supplied rack ears and hardware for attachment to  
the chassis.  
• Rubber feet (4) – For installing the chassis on a  
2. To secure the chassis to the rack, use four screws with  
washers (not provided) to prevent marring the front panel.  
level surface.  
Note: Neoprene rubber washers are a good choice because they grip  
the screw head and prevent the screws from backing out from vibration  
or during transportation.  
• Rack ears  
with mounting  
hardware (2) –  
For installing the  
mixer/amplifier  
chassis (2U) in a  
(6) #8-32 x 1/2 in  
Rack ears  
rack.  
4.3 Placement guidelines  
For placement of the mixer/amplifier chassis, keep the following  
in mind:  
Attaching rack ears  
to the chassis  
• Make sure that air can circulate freely behind, beside, and  
above the chassis for adequate ventilation. There are intake  
vents on the sides and an exhaust vent on the back of the unit.  
Do not cover or block the vents.  
Mounting the chassis  
in the rack  
(rack screws and  
washers not provided)  
CAUTION: To transport the rack-mounted chassis, be sure  
the rear of the chassis is supported mechanically in the rack.  
Install a shelf under the unit or use brackets for rear support.  
Lack of proper support may result in damage to the chassis.  
• Make sure the chassis is protected from heat and kept away  
from direct heat sources, such as heating vents and radiators.  
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4.0 Hardware Installation  
4.6.1.3 Recommended cable lengths  
4.6 User interface (accessory)  
The FreeSpace® DXA 2120 Digital Mixer/Amplifier is designed to  
be compatible with the following Bose® user interfaces:  
For one user interface  
2000 ft (610 m) max.  
Chassis  
• Bose® Volume Control User Interface (PC 041966)  
22-24 AWG or 0.34-0.25mm2  
gauge cable  
• Bose® Volume Control with A/B Select User Interface  
(PC 041967)  
For two user interfaces  
2000 ft (610 m) max.  
Chassis  
4.6.1 User interface installation  
22-24 AWG or 0.34-0.25mm2  
gauge cable  
Volume control with A/B select user interface  
4.6.1.4 User interface connections  
Connect the user interface wires to the appropriate terminals on  
the 6-pin connector, and insert it into the REMOTE jack.  
CAUTION: Use only 22-24 AWG or 0.34-0.25mm2 gauge  
cable to connect the user interface to the mixer/amplifier  
.
Volume control user interface  
Rear connection panel  
4.6.1.1 Additional equipment required (not supplied)  
Double-gang electrical box  
Cable*  
User interface jack with Euroblock connector  
See section 4.6.1.5 for wiring diagrams.  
*For the volume control user interface, use a single twisted pair of  
data-grade cable (22-24 AWG or 0.34-0.25mm2).  
*For the volume control with A/B select user interface, use two  
twisted pairs of data-grade cable (22-24 AWG or 0.34-0.25mm2).  
4.6.1.2 Assembly  
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4.0 Hardware Installation  
4.6.1.5 User interface wiring  
Schematic for volume control  
with A/B select user interface  
6-terminal input connector  
mounts to REMOTE jack  
on the chassis  
User interface connector  
One volume control user interface  
Two volume control user interfaces  
4.7 System wiring  
Input and Output wiring information and illustrations are provided  
on pages that follow.  
One volume control with A/B select user interface  
WARNING: Be sure the mixer/amplifier is disconnected from  
the AC (mains) power before making any connections.  
4.7.1 LINE 1-4 source inputs  
There are two sets of line input jacks for use with varied connec-  
tor types.  
4.7.1.1 RCA connections  
Two volume control with A/B select user interfaces  
Audio sources can be connected to the LINE INPUT 1-4 RCA  
jacks using one of the following cable types:  
LINE IN  
Source Connector  
S
S
S
T
T
T
RCA  
1
S
3
2
T
1
2
XLR  
3
4.6.1.6 Detailed schematics of user interfaces  
S
S
T
Schematic for volume control user interface  
T
T
R
S
Phone  
Plug  
(Balanced)  
S
S
T
T
T
S
Phone  
Plug  
(Unbalanced)  
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4.0 Hardware Installation  
4.7.1.2 Euroblock connections  
4.7.2 DIRECT source input  
A microphone or other audio source can connect to the DIRECT  
INPUT jack using one of the following cable types.  
A microphone or other balanced audio source can be connected  
to the MIC/LINE INPUT 1-4 Euroblock terminals input using one  
of the following cable types.  
The control input requires a normally open switch.  
MIC/LINE IN  
Source Connector  
DIRECT IN  
Source Connector  
T
S
T
S
RCA  
S
RCA  
S
T
T
TRIG  
2
3
1
2
3
1
1
2
1
2
XLR  
XLR  
3
3
TRIG  
T
R
S
T
R
S
T
R
S
T
R
S
Phone  
Plug  
Phone  
Plug  
(Balanced)  
(Balanced)  
TRIG  
T
S
T
S
T
S
Phone  
Plug  
T
S
Phone  
Plug  
(Unbalanced)  
(Unbalanced)  
TRIG  
Normally  
Open Switch  
(latching)  
TRIG  
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4.0 Hardware Installation  
Follow the diagram below to insert the 5-terminal connector into  
the output jacks on the back of the mixer/amplifier.  
4.7.3 PAGE source input  
A microphone or another paging source can be connected to the  
PAGE INPUT jack using one of the following cable types.  
Notice the proper wiring for 4 ohm, 70 volt or 100 volt uses. Both  
70V and 100V wiring require the use of a jumper cable, as shown.  
Note: Use 12 AWG (4 mm2) to 20 AWG (0.5 mm2) gauge wire for the  
jumper.  
T
RCA  
S
Rear connection panel  
S
T
OUTPUT 2  
OUTPUT 1  
PTT  
2
3
1
1
2
XLR  
3
PTT  
Input voltage switch  
T
R
S
T
R
S
Phone  
Plug  
(Balanced)  
PTT  
T
S
T
S
Phone  
Plug  
(Unbalanced)  
PTT  
Normally  
Open Switch  
(latching)  
PTT  
OUTPUT 1 and OUTPUT 2  
4 Ohm wiring  
4.7.4 OUTPUT connections  
Use the supplied 5-terminal connectors for wiring loudspeakers  
to the output jacks on the rear of the mixer/amplifier.  
5-terminal connector  
Screw terminal caps  
70 Volt wiring  
Insert the speaker wire into the proper terminals for the type of  
voltage needed, as shown in the figure on the right.  
Tighten the screws to hold the wires in place, and insert the screw  
terminal caps to cover each screw. These caps prevent making  
contact with the screws, which could cause an electrical shock.  
100 Volt wiring  
WARNING: Terminals marked with are hazardous live. The  
external wiring connected to these terminals should be installed by  
an instructed person.  
WARNING: Terminals marked with should be connected  
to the loudspeakers such that the metal parts of its terminal are  
inaccessible.  
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4.0 Hardware Installation  
4.7.5 AUX output connection  
4.8 AC POWER connection  
The signal and any applied processing from any of the four inputs  
can be output using the line-level AUX OUTPUT jack. This output  
can feed into another amplifier or other equipment used in the  
installation.  
4.8.1 Input voltage setting (120 or 220-240V)  
The rear connection panel of the mixer/amplifier chassis  
provides an input voltage switch for 120V or 220-240V use.  
An input voltage switch is not provided on the 100V version.  
AUX OUT  
Connector  
Change the setting only as needed.  
Check the switch setting to be sure it is appropriate for the local  
power standard.  
T
RCA  
S
S
T
Set for 120V  
Set for 220-240V  
WARNING: Be sure to disconnect the mixer/amplifier chassis  
from AC power before changing the input voltage setting on the rear  
connection panel.  
2
3
1
1
2
XLR  
3
4.8.2 Fuse type  
Be sure the proper supplied fuse is inserted in the fuse box.  
Replace the fuse as needed with the proper type. 120V units  
require a T6.3AL/250V fuse. 220V-240V units require a T3.15AL/  
250V fuse.  
T
R
S
T
R
S
Phone  
Plug  
(Balanced)  
4.8.3 AC POWER connection  
Insert the proper power cord for the voltage used in your region.  
4.9 DC POWER connection  
This unit allows for +24V DC battery backup power in case there  
is a mains power failure. There will be a noticeable reduction in  
output due to the limited power of this backup power source.  
T
S
T
S
Phone  
Plug  
(Unbalanced)  
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5.0 System Setup  
5.2.1 Selecting an operation mode  
5.1 System setup introduction  
The setting menus available depend on the mode of operation  
you choose. Use the right arrow button to enter the mode menu.  
Then use the up or down arrows to select the mode you want.  
Choose from:  
This section provides instructions on adjusting system settings  
for preferred operation. To make these settings, the system must  
be connected to power and the POWER switch set to ON.  
Rear connection panel  
• Mixer Mode: The system can mix up to four mic/line inputs to  
each of the two output channels for use in one or two zones.  
• Stereo Select Mode: With up to two stereo sources  
connected and using both output channels, the system  
provides stereo sound to a single output zone.  
POWER switch  
• Dual Mono Select Mode: With two input sources connected  
to each of the two output channels, the system provides audio  
in two zones.  
AC power cord  
jack  
• Utility: Includes system lockout, an option to restore all  
settings to the factory defaults, and the ability to view firmware  
and EQ versions.  
Front control panel  
To confirm your selection, press the SELECT button. An  
asterisk (*) appears to the left of the selection made.  
5.2.2 Setting the options for that mode  
There are several ways to change settings and particular buttons  
to use for each type of setting. Such as:  
POWER  
LED  
Note: When the system is unplugged, or if a power loss occurs,  
these system settings are retained in flash memory. However,  
continuous system operation during a power loss requires the use  
of an optional backup power source.  
• To adjust Input Vol Lvl, use the knobs on the  
mixer/amplifier front panel only. The level that  
is set appears in the menu field, but cannot be  
changed in the menu.  
5.2 System setup procedure  
• For Output Vol Lvl, adjust the gain knobs for  
output, located in the front control compartment.  
When the unit is on, the POWER LED lights. Opening the front  
control compartment gives you access to the LCD and control  
buttons. The LCD displays the product model name at startup.  
• For Output Bass Lvl and Output Treb Lvl, turn the  
gain screws for bass and treble, located in the front  
control compartment.  
Front control compartment  
• For Page Vol Lvl, use the PAGE GAIN knob, located  
in the front control compartment.  
• To change Adj menu fields:  
1. Activate the field by pressing SELECT.  
SELECT button  
Arrow buttons  
2. Use the up or down arrow to adjust the value.  
3. Press SELECT to confirm the setting and move on.  
• If the system is locked, simultaneously press the left and right  
arrow buttons and hold for five seconds. Lockout Off appears.  
• When the system is unlocked, you can navigate to system  
setup options.  
Note: After a 45 second pause (with no activity), the system  
resets to the initial menu for the chosen mode.  
• Use the SELECT button to activate a menu  
option and to confirm a new setting.  
• Use the arrow buttons to the right of the LCD  
to move forward, back, up, and down through  
menus.  
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5.0 System Setup  
5.3.1 A reminder: the settings process  
5.3 Mixer Mode settings  
• For various adjustments (designated by Adj) use these steps:  
1. Press SELECT to activate the Adj field.  
Here is an overview of common steps to follow in setting up the  
Mixer Mode:  
2. Using the up or down arrow, adjust the value.  
A. Choose this mode.  
3. Press SELECT to confirm the setting and move on.  
B. Set up inputs.  
C. Set up outputs.  
• For level changes (designated by Lvl), use front panel controls  
as shown.  
D. Choose EQ settings.  
• To change Input Vol Lvl, use:  
• To change Output Vol Lvl, use:  
E. Set up Page Input, if applicable.  
F. Set up Direct Input, if applicable.  
G. Set up Master Volume, if applicable.  
• To change Output Bass Lvl and Output  
Treb Lvl, use a screwdriver to turn:  
Setup menus unfold as you move right to the options provided,  
as shown.  
• To change Page Vol Lvl, use:  
A
Choose Mixer Mode  
Press SELECT ( ) to confirm the mode selection.  
An asterisk (*) marks the selection made.  
B
next page  
C
next page  
D
page 19  
E
page 20  
F
page 21  
G
page 21  
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5.0 System Setup  
B
Mixer Input Set-up  
Select each Input that has a source connected (1, 2, 3, & 4).  
•
•
For Input Vol Lvl  
For Input Bass Adj and Input Treb Adj  
Adjust the value to +/-6 dB in increments of .5 dB.  
Note: AGC defaults to N.  
•
For AGCEnable  
Choose N (no) or Y (yes).  
AGC is recommended for use  
with low-level sources (i.e.  
microphone with low sensitivity).  
C
Mixer Output Set-up  
Select each Output to be used (1, 2, or Auxout).  
•
For Input Mix  
Choose N (no) or Y (yes).  
•
•
For Output Vol Lvl  
For Output Bass Lvl  
and Input Treb Lvl  
Adjust the value to +/-6 dB in increments of .5 dB.  
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5.0 System Setup  
D
Mixer EQ Set-up  
Select each Output to be used (1, 2, or Auxout).  
•
•
For Spkr EQ  
Move up or down to choose the EQ  
setting needed.  
An asterisk (*) marks the selection made.  
For Dynamic EQ Enable  
Choose N (no) or Y (yes).  
Note: Dynamic EQ maintains tonal balance at all  
listening levels. The equalization adjusts automatically  
for the output level setting.  
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5.0 System Setup  
E
Mixer Page In Set-up  
•
•
For Page Vol Lvl  
For Page Bass Adj  
and Page Treb Adj  
Adjust the value to  
+/-6 dB in increments of .5 dB.  
•
•
For Page Enable  
Choose N (no) or  
Y (yes).  
For Page Ducking  
Lvl Adj  
Adjust the value from  
-50 dB to 0 dB in increments of  
1 dB.  
•
•
For Output Lvl Adj  
Adjust the value to  
+/-20 dB in increments  
of 1 dB.  
For Page Trig Mode  
Choose PTT or Auto.  
Note: In Page Trig Mode, the page  
output can be triggered by pushing  
the button on a push-to-talk-style  
microphone (PTT), or triggers  
automatically when a signal is  
detected at the Page input (Auto).  
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5.0 System Setup  
F
Mixer Direct In Set-up  
•
•
For Vol Adj  
Adjust the value from -40 dB to  
+10 dB in increments of 1 dB.  
For Bass Adj and Treb Adj  
Adjust the value to +/-6 dB  
in increments of .5 dB.  
G
Mixer Master Vol Set-up  
•
For Output Linked  
Choose N (no)  
or Y (yes).  
Note: Y links Output 1 and Output 2  
gains for control using the  
Output 1 gain knob.  
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5.0 System Setup  
5.4.1 Remember: for adjustments, use three steps  
5.4 Stereo Select Mode settings  
• For various adjustments (designated by Adj), use these steps:  
1. Press SELECT to activate the Adj field.  
Here is an overview of common steps to follow in setting up the  
Stereo Select Mode:  
2. Using the up or down arrow, adjust the value.  
A. Choose this mode.  
3. Press SELECT to confirm the setting and move on.  
B. Set up inputs.  
C. Set up outputs.  
• For level changes (designated by Lvl), use front panel controls  
as shown.  
D. Choose EQ settings.  
E. Set up Page Input, if applicable.  
F. Set up Direct Input, if applicable.  
• To change Input Vol Lvl, use:  
• To change Output Vol Lvl, use:  
Setup menus unfold as you move right to the options provided,  
as shown.  
• To change Output Bass Lvl and Output  
Treb Lvl, use a screwdriver to turn:  
• To change Page Vol Lvl, use:  
A
Choose Stereo Select Mode  
Press SELECT ( ) to confirm the mode selection.  
An asterisk (*) marks the selection made.  
B
next page  
C
next page  
D
page 24  
E
page 24  
F
page 25  
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5.0 System Setup  
B
Stereo Select Input Set-up  
Select each Input that has a source connected.  
•
•
•
For Input Vol Lvl  
For Input Bass Adj and Input Treb Adj  
Adjust the value to +/-6 dB in increments of .5 dB.  
For AGCEnable  
Choose N (no) or Y (yes).  
Note: AGC defaults to N. AGC is recommended for use with low-level  
sources (i.e., microphone with low sensitivity).  
C
Stereo Select Output Set-up  
Select each Output to be used (1/2 or Auxout).  
•
•
For Output Vol Lvl  
For Output Bass Lvl and Input Treb Lvl  
Adjust the value to +/-6 dB in increments of .5 dB.  
•
•
For Out 1/2 Input Sel  
For Auxout Input Sel  
Selects which inputs are  
routed to the Aux output.  
Input TrackWP tracks to  
A/B switch on user interface.  
Note: If TrackWP is selected and a user interface is installed, the input  
(A/B) selected on the user interface will be displayed.  
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5.0 System Setup  
D
Stereo Select EQ Set-up  
•
For Spkr EQ  
Move up or down  
to choose the EQ setting needed.  
An asterisk (*) marks the selection made  
•
For Dynamic EQ Enable  
Choose N (no) or Y (yes).  
Note: Dynamic EQ maintains tonal balance at  
all listening levels. The equalization adjusts  
automatically for the output level setting.  
E
Stereo Select Page In Set-up  
•
•
For Page Vol Lvl  
For Page Bass Adj  
and Page Treb Adj  
Adjust the value to +/-6 dB  
in increments of .5 dB.  
•
•
For Page Enable  
Choose N (no) or Y (yes).  
For Page Ducking Lvl Adj  
Adjust the value from  
-50 dB to 0 dB in increments  
of 1 dB.  
•
•
For Output Lvl Adj  
Adjust the value to +/-20 dB  
in increments of 1 dB.  
For Page Trig Mode. Choose  
PTT or Auto.  
Note: In Page Trig Mode, the page  
output can be triggered by pushing  
the button on a push-to-talk-style  
microphone (PTT), or triggers  
automatically when a signal is  
detected at the Page input (Auto).  
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5.0 System Setup  
F
Stereo Select Direct in Set-up  
•
•
For Vol Adj  
Adjust the value from -40 dB to  
+10 dB in increments of 1 dB.  
For Bass Adj and Treb Adj  
Adjust the value to +/-6 dB  
in increments of .5 dB.  
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5.0 System Setup  
5.5.1 Remember: for adjustments, use three steps  
5.5 Dual Mono Select Mode settings  
• For various adjustments (designated by Adj), use these steps:  
1. Press SELECT to activate the Adj field.  
Here is an overview of common steps to follow in setting up the  
Dual Mono Select Mode:  
2. Using the up or down arrow, adjust the value.  
A. Choose this mode.  
3. Press SELECT to confirm the setting and move on.  
B. Set up inputs.  
C. Set up outputs.  
• For level changes (designated by Lvl), use front panel controls  
as shown.  
D. Choose EQ settings.  
E. Set up Page Input, if applicable.  
F. Set up Direct Input, if applicable.  
• To change Input Vol Lvl, use:  
• To change Output Vol Lvl, use:  
Setup menus unfold as you move right to the options provided,  
as shown.  
• To change Output Bass Lvl and Output  
Treb Lvl, use a screwdriver to turn:  
• To change Page Vol Lvl, use:  
A
Choose Dual Mono Mode  
Press SELECT ( ) to confirm the mode selection.  
An asterisk (*) marks the selection made.  
B
next page  
C
next page  
D
page 28  
E
page 28  
F
page 29  
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5.0 System Setup  
B
Dual Mono Select Input Set-up  
Select each Input that has a source connected (1, 2, 3 & 4).  
•
•
For Input Vol Lvl  
For Input Bass Adj  
and Input Treb Adj  
Adjust the value to +/-6 dB  
in increments of .5 dB.  
For AGCEnable  
•
Choose N (no) or Y (yes).  
Note: AGC defaults to N. AGC is recommended for  
use with low-level sources (i.e., microphone with low  
sensitivity).  
C
Dual Mono Select Output Set-up  
Select each Output  
to be used (1, 2,  
or Auxout).  
•
•
For Output Vol Lvl  
For Output Bass Lvl and Input Treb Lvl  
Adjust the value to +/-6 dB in increments of .5 dB.  
•
•
For Out 1 and Out 2 Input Sel  
For Auxout Input Sel  
Selects which inputs are routed to the Aux output.  
Input TrackWP tracks to A/B switch on user interface.  
Note: If TrackWP is selected and a user interface is installed, the input  
(A/B) selected on the user interface will be displayed.  
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5.0 System Setup  
D
Dual Mono Select EQ Set-up  
•
For Spkr EQ  
Move up or down  
to choose the EQ setting needed.  
An asterisk (*) marks the selection made.  
•
For Dynamic EQ Enable  
Choose N (no) or Y (yes).  
E
Dual Mono Select Page in Set-up  
Note: Dynamic EQ maintains tonal balance  
at all listening levels. The equalization adjusts  
automatically for the output level setting.  
•
•
For Page Vol Lvl  
For Page Bass Adj  
and Page Treb Adj  
Adjust the value to +/-6 dB  
in increments of .5 dB.  
•
•
For Page Enable  
Choose N (no) or Y (yes).  
For Page Ducking Lvl Adj  
Adjust the value from  
-50 dB to 0 dB in  
increments of 1 dB.  
•
•
For Output Lvl Adj  
Adjust the value to  
+/-20 dB in increments  
of 1 dB.  
For Page Trig Mode. Choose PTT or Auto.  
Note: In Page Trig Mode, the page output can be  
triggered by pushing the button on a push-to-talk-style  
microphone (PTT), or triggers automatically when a  
signal is detected at the Page input (Auto).  
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5.0 System Setup  
F
Dual Mono Select Direct In Set-up  
•
•
For Vol Adj  
Adjust the value from  
-40 dB to +10 dB  
in increments of 1 dB.  
For Bass Adj and Treb Adj  
Adjust the value to +/-6 dB  
in increments of .5 dB.  
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5.0 System Setup  
5.6 Overview of Utility Mode settings  
In Utility Mode, there are two global system options: Lockout and  
Restore Factory Defaults. Also, current system firmware and EQ  
versions are viewable.  
The Lockout option allows the system settings to be locked to  
prevent unwanted changes. This Lockout function can be  
disengaged by pressing and holding the left and right arrows  
simultaneously for five seconds. Lockout Off will appear.  
The Restore Factory Defaults option allows all software-  
selectable settings to be set back to the original factory settings.  
See “Factory Default Settings” on page 33.  
Note: Settings made using a control knob are not reset.  
Choose Utility Mode  
•
•
For FW Version  
Version number of system  
firmware will be displayed.  
For EQ Version  
Version number of  
loudspeaker EQ set  
will be displayed.  
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6.0 User Interfaces  
6.1.1.1 Mixer Mode user interface application  
6.1 User interface use  
Bose has designed two user interface  
controls for use with the FreeSpace®  
DXA 2120 Digital Mixer/Amplifier.  
Adjusts  
the volume  
of the OUTPUT 2  
audio mix  
Adjusts  
the volume  
of the OUTPUT 1  
audio mix  
• Bose volume control user interface  
is for use when only volume control is  
required.  
• Bose volume control with A/B select  
user interface is for use in Stereo Select  
Mode or Dual Mono Select Mode when  
an output provides audio from more than  
one input source.  
GAIN knobs  
disabled with  
user interface  
use  
Connection of one or two user interfaces to the chassis disables  
the output gain knob for the output assigned to that user  
interface.  
Note: Output 1 gain can be configured as the Master Volume,  
controlling Output 1 and Output 2 gains simultaneously using the  
MasterVol Linked menu option.  
6.1.1 Mode user interface requirements  
• For Mixer Mode:  
Sources can be routed to either or both outputs. Use of one or  
two volume control user interfaces is optional. No user inter-  
faces are required.  
6.1.1.2 Stereo Select Mode user interface application  
Adjusts  
the volume  
• For Stereo Select Mode:  
Source routing is fixed. This mode supports the use of one user  
interface in a single zone. Use the volume control with A/B  
select user interface.  
Selects one  
source (A) or  
the other (B)  
in the single zone  
• For Dual Mono Select Mode:  
GAIN knobs  
disabled with  
user interface  
use  
Source routing is fixed. This mode supports the use of one user  
interface for each output channel. Use two volume controls  
with A/B select user interfaces.  
6.1.1.3 Dual Mono Select Mode user interface application  
Adjusts  
the volume  
Adjusts  
the volume  
Selects one  
source (A) or  
the other (B)  
in Zone 1  
Selects one  
source (A) or  
the other (B)  
in Zone 2  
GAIN knobs  
disabled with  
user interface  
use  
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7.0 Troubleshooting Table  
No Power  
• Turn on power.  
• Make sure the power cord is plugged in.  
Power is on, but no sound  
• Make sure the source is turned on.  
• Verify that there is an input signal from the source. The audio input signal indicator on  
the front of the chassis should be green.  
• Check the output signal indicators on the system controls. If the LED is not lit (green),  
the output levels may be too low.  
• Check the source routing.  
• Check the cable connections from the source to the chassis.  
• Verify the user interfaces are of the right type for the operating mode selected.  
Power is on, but sound is low  
Sound is distorted  
• Verify that the audio input indicator is lit (green). If it is not lit, increase the source  
output or increase the input gain.  
• Verify that the Input clipping indicators are not lit (red). If an LED is red, reduce the  
source output level or reduce the input gain.  
• Verify that the Output clipping indicators are not lit (red). If one is red, but Input clip-  
ping LEDs are not, reduce the output gain.  
• If the input source signal is clean when it enters the chassis and the Input and Output  
indicators are green, verify that the loudspeakers are not overdriven or damaged.  
Unnatural sound  
• Verify that the correct EQ is selected for speakers connected to the Output channel.  
• Verify that the speakers are wired correctly (+ to + and - to -).  
User interfaces do not operate  
properly  
• Verify that the user interfaces are wired correctly and to the proper zone (if there is  
more than one zone).  
• Check the wiring for breaks or shorts in the cable.  
• Verify the user interfaces are of the right type for the operating mode selected.  
7.1 Technical assistance  
If you need further technical assistance, contact your local Bose® representative, or visit pro.Bose.com.  
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8.0 Reference  
8.1 Factory Default Settings  
Parameter Range  
(if applicable)  
Channel  
Parameter  
Mixer  
Stereo  
Dual Mono  
Input 1  
Bass  
0 dB  
0 dB  
0 dB  
-6 dB ~ +6 dB  
-6 dB ~ +6 dB  
Treble  
0 dB  
0 dB  
0 dB  
AGC Enable  
N
N
N
Input 2  
Bass  
0 dB  
0 dB  
0 dB  
-6 dB ~ +6 dB  
-6 dB ~ +6 dB  
Treble  
0 dB  
0 dB  
0 dB  
AGC Enable  
N
N
N
Input 3  
Bass  
0 dB  
0 dB  
0 dB  
-6 dB ~ +6 dB  
-6 dB ~ +6 dB  
Treble  
0 dB  
0 dB  
0 dB  
AGC Enable  
N
N
N
Input 4  
Bass  
0 dB  
0 dB  
0 dB  
-6 dB ~ +6 dB  
-6 dB ~ +6 dB  
Treble  
0 dB  
0 dB  
0 dB  
AGC Enable  
N
N
N
Page Input  
Bass  
0 dB  
0 dB  
0 dB  
-6 dB ~ +6 dB  
-6 dB ~ +6 dB  
Treble  
0 dB  
0 dB  
0 dB  
Trigger Mode  
PTT  
PTT  
PTT  
Page Ducking  
-20 dB  
-20 dB  
-20 dB  
-50 dB ~ 0 dB  
-40 dB ~ +10 dB  
-6 dB ~ +6 dB  
-6 dB ~ +6 dB  
Direct Input  
Volume  
0 dB  
0 dB  
0 dB  
Bass  
0 dB  
0 dB  
0 dB  
Treble  
0 dB  
0 dB  
0 dB  
Miscellaneous  
Output 1  
Master Volume Linked  
*Out 1/2 Input Sel (Stereo only)  
Out 1 Input Sel (Dual Mono only)  
Input Mix - Input 1 (Mixer only)  
Input Mix - Input 2 (Mixer only)  
Input Mix - Input 3 (Mixer only)  
Input Mix - Input 4 (Mixer only)  
Spkr EQ Preset  
N
n/a  
n/a  
n/a  
*1/2 (1)  
n/a  
n/a  
n/a  
1
Y
n/a  
n/a  
N
n/a  
n/a  
N
n/a  
n/a  
N
n/a  
n/a  
01 80 Hz HPF  
01 80 Hz HPF  
01 80 Hz HPF  
Dynamic EQ Enable  
Page Enable  
N
N
N
N
N
N
Page Level  
0 dB  
0 dB  
0 dB  
-20 dB ~ +20 dB  
Output 2  
*Out 1/2 Input Sel (Stereo only)  
Out 2 Input Sel (Dual Mono only)  
Input Mix - Input 1 (Mixer only)  
Input Mix - Input 2 (Mixer only)  
Input Mix - Input 3 (Mixer only)  
Input Mix - Input 4 (Mixer only)  
Spkr EQ Preset  
n/a  
*1/2 (2)  
n/a  
n/a  
n/a  
3
Y
n/a  
n/a  
N
n/a  
n/a  
N
n/a  
n/a  
N
n/a  
n/a  
01 80 Hz HPF  
01 80 Hz HPF  
01 80 Hz HPF  
Dynamic EQ Enable  
Page Enable  
N
N
N
N
N
N
Page Level  
0 dB  
0 dB  
0 dB  
-20 dB ~ +20 dB  
Auxout  
Auxout Input Sel (Stereo/Dual Mono)  
Auxout Input Mix - Input 1 (Mixer only)  
Auxout Input Mix - Input 2 (Mixer only)  
Auxout Input Mix - Input 3 (Mixer only)  
Auxout Input Mix - Input 4 (Mixer only)  
Spkr EQ Preset  
n/a  
1+2 sum  
1 Fixed  
Y
n/a  
n/a  
N
n/a  
n/a  
N
n/a  
n/a  
N
n/a  
n/a  
01 80 Hz HPF  
01 80 Hz HPF  
01 80 Hz HPF  
Dynamic EQ Enable  
Page Enable  
N
N
N
N
N
N
Page Level  
0 dB  
0 dB  
0 dB  
-20 dB ~ +20 dB  
*These parameters are linked and displayed on the same menu screen. The numbers in parenthesis indicate which input is automati-  
cally selected and routed to the respective output.  
33 of 36  
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©2007 Bose Corporation, The Mountain  
Framingham, MA 01701-9168 USA  
AM298725 Rev.00  
pro.Bose.com  
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