Bose Speaker 791 User Guide page
®
VIRTUALLY INVISIBLE 791 SPEAKERS  
Installation Guide  
Installationsvejledning  
Installationsanleitung  
Guía de instalación  
Asennusopas  
Notice d’installation  
Telepítési útmutató  
Guida di installazione  
Gebruikershandleiding  
Podręcznik instalacji  
Installationsanvisning  
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SAFETY INFORMATION  
Mount these speakers in wood frame or  
similar construction only  
Important words of caution  
Please read this owner’s guide completely before you start.  
Then carefully consider your experience using the tools and  
taking the precautions referred to here.  
Each speaker requires a round space of 85/8 in. (21.9 cm)  
diameter, plus a minimum of 41/8 in. (10.5 cm) of depth behind  
wallboard that is a maximum of 3/4 in. (1.9 cm) thick.  
If you have doubts about doing this installation, you should  
contact either the dealer you purchased the product from, an  
electrician, or a professional audio/video installer. You can  
describe the job and request a cost estimate before committing  
to installation service.  
Bose recommends installing these speakers only in wood frame  
or similar ceiling construction with adequately spaced studs, as  
found in 2 x 6 construction. These installation guide instructions  
are specific to this type of installation only.  
WARNING: Installation shall be in accordance with the applicable  
section of the National Electrical Code, ANSI/NFPA 70, and/or the  
National Fire Alarm Code, ANSI/NFPA 72, as applicable. The wiring  
method and compartment shall be such as not to interfere with the  
operation of the speaker.  
Important safety instructions  
1. Read these instructions – for all components before using  
this product.  
2. Keep these instructions – for future reference.  
3. Heed all warnings – on the product and in the owner’s guide.  
4. Follow all instructions.  
CAUTIONS:  
• Failure to follow the instructions in this owner’s guide voids all  
warranties on your speakers.  
5. Install in accordance with the manufacturer’s instructions.  
6. Only use attachments/accessories specified by the  
manufacturer.  
• These speakers are not designed or recommended for  
installation in walls, in ceilings of masonry, or in drop ceilings.  
• This product is not intended for use in Air-Handling Plenum  
Spaces.  
• Consult local building codes before you get started with this  
installation.  
• See product enclosures for safety-related markings.  
• Make no modifications to the speakers or accessories.  
Unauthorized alterations may compromise safety, regulatory  
compliance, and system performance.  
• Be sure to keep all insulation away from speakers in  
accordance with the installation instructions in this guide.  
For your records  
Serial numbers are located on the rear of each of your Virtually  
Invisible® 791 speakers.  
Serial numbers: _____________________ ____________________  
Serial numbers: _____________________ ____________________  
Serial numbers: _____________________ ____________________  
Dealer name: ___________________________________________  
Dealer phone: ___________________________________________  
Purchase date: ___________________________________________  
We suggest you keep your sales receipt and warranty card  
together with this owner’s guide.  
VIRTUALLY INVISIBLE is a registered trademark of Bose Corporation in the U.S. and other countries.  
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OVERVIEW AND CONTENTS  
PREPARATION  
2
Basic steps to installation  
Before you begin... . . . . . . . . . . . . . . . . . . . . . . . .  
Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Other equipment you will need . . . . . . . . . . . . .  
2
2
2
The instructions on the pages that follow will help you  
complete each of the steps below.  
Step 1:  
If painting is in your plan . . . . . . . . . . . . . . . . .  
Selecting speaker cable . . . . . . . . . . . . . . . . . .  
Preparing the cable wires . . . . . . . . . . . . . . . .  
Placement guidelines . . . . . . . . . . . . . . . . . . . . . .  
Using the arrow as a guide . . . . . . . . . . . . . . . .  
Placing speakers for stereo sound . . . . . . . . . .  
Placing speakers for home theater . . . . . . . . . .  
Other considerations . . . . . . . . . . . . . . . . . . . . .  
2
3
3
4
4
4
5
5
Choose approximate locations for each  
speaker.  
Step 2:  
Observe the cautions and use the template  
for precise placement.  
Step 3:  
Cut the hole for each speaker.  
INSTALLATION  
6
Step 4:  
Wire each speaker.  
Preparing the ceiling . . . . . . . . . . . . . . . . . . . . . .  
6
Using the template . . . . . . . . . . . . . . . . . . . . . .  
Drilling a pilot hole . . . . . . . . . . . . . . . . . . . . . . .  
Cutting the speaker hole . . . . . . . . . . . . . . . . . .  
Getting the wire ready . . . . . . . . . . . . . . . . . . . .  
6
6
7
7
Step 5:  
Insert and secure the speaker in the ceiling.  
Step 6:  
Connecting the speaker . . . . . . . . . . . . . . . . . . . .  
8
Test each speaker to make sure it works.  
Finishing the installation . . . . . . . . . . . . . . . . . . .  
Securing the speaker . . . . . . . . . . . . . . . . . . . .  
8
8
Testing each speaker . . . . . . . . . . . . . . . . . . . . 10  
Attaching the grille . . . . . . . . . . . . . . . . . . . . . . 10  
REFERENCE  
11  
Painting the exterior parts . . . . . . . . . . . . . . . . . . 11  
Painting the grille . . . . . . . . . . . . . . . . . . . . . . . 11  
Painting the frame . . . . . . . . . . . . . . . . . . . . . . . 12  
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . 13  
Customer service . . . . . . . . . . . . . . . . . . . . . . . . . 14  
Limited warranty . . . . . . . . . . . . . . . . . . . . . . . . . . 14  
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14  
Technical information . . . . . . . . . . . . . . . . . . . . . 14  
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PREPARATION  
Other equipment you will need  
Before you begin...  
Hardware for securing the speaker to your ceiling is  
attached to the speaker. In addition, you need a ladder  
and the equipment below to make the installation go  
smoothly.  
Thank you for choosing Bose® Virtually Invisible® 791  
speakers for in-ceiling installation. These top-of-the-line  
Virtually Invisible® speakers provide superior perfor-  
mance for stereo and home theater enjoyment. Their  
slim profile blends well into your room, so only the  
sound...not the speakers...stands out.  
Please be sure to read this guide carefully before you do  
any cutting. There are many factors to consider before  
proceeding with this type of installation.  
Wire cutter/stripper  
Speaker cable  
Spade  
drill bit  
Unpacking  
Carefully unpack the speakers. Check to be sure the  
carton includes all the parts shown.  
Power drill  
Cutting tool*  
Sharp pencil  
Protective eyewear  
Stud finder  
Painter’s tape**  
Tape measure  
Template/Paint shield  
Speaker grilles  
Square-head  
or Phillips-head  
screwdriver  
Speakers  
If painting is in your plan  
Be sure to read “Painting the exterior parts” on page 11  
before you begin installing your speakers. There are a  
number of suggestions on how to protect the speakers  
and spread the paint evenly on the speakers before you  
secure them in your ceiling.  
If any part of the speaker pair appears damaged, do  
not use it. Notify Bose or your authorized Bose dealer  
immediately. For Bose contact information, refer to  
the address list included in the carton.  
Note: With the speakers unpacked, you can find the serial  
numbers on the back of each one. Then you can copy the  
numbers onto your warranty card and in the “For your records”  
space on page ii.  
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PREPARATION  
Preparing the cable wires  
Selecting speaker cable  
Speaker cable consists of two insulated wires. The  
insulation around one wire is marked (striped, collared,  
or ribbed) to identify it as positive. The other wire is  
negative.  
If your cables are not yet installed, use these guidelines  
for choosing and using speaker cable. If your cables are  
already installed, check to be sure they meet these  
standards.  
Gauge  
Maximum Length  
20 ft (6 m)  
Note: It is sometimes difficult to distinguish wire  
markings. Inspect both wires carefully.  
18 AWG (0.82 mm2)  
16 AWG (1.3 mm2)  
14 AWG (2.1 mm2)  
12 AWG (3.3 mm2)  
1. Strip approximately 1/2 in. (13 mm) of insulation from  
30 ft (9 m)  
both wires.  
50 ft (15 m)  
90 ft (27 m)  
2. Twist the bare end of each wire so loose strands will  
not touch across terminals.  
Be sure to connect each wire to the proper speaker  
terminal, positive to positive (+) and negative to  
negative (–).  
Consider the location of the speakers and be sure to  
allow enough cable to reach each one. This includes the  
extra length needed for wiring the speaker before  
inserting it into the ceiling.  
Note: For information on installing cable, consult a  
professional electrician or audio/video installer, or look  
for reference books at a local home building retail store.  
3
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PREPARATION  
Placing speakers for stereo sound  
Position these two speakers:  
Placement guidelines  
Orienting and placing these identical speakers is critical  
to their performance.  
– one on the left and one on the right at the front of  
the room  
Follow these guidelines in choosing the approximate  
location for each speaker. Before you mark the location  
for the ceiling holes, be sure to read:  
– oriented with the arrow pointing to the opposite  
speaker  
– an equal distance from the primary listening area  
– with each one AT LEAST:  
• “Other considerations” on page 5, and  
• “WARNINGS:” on page 6.  
- 2 ft (.6 m) from the front wall  
- 3 ft (1 m) from the side walls  
- 6 ft (2 m) apart  
Using the arrow as a guide  
There is a small arrow molded into the inside flange  
of each speaker. Use it as a guide for orienting the  
speakers relative to one another.  
Front of your room  
Minimum  
2' (.6 m)  
Minimum  
2' (.6 m)  
Guide arrow  
Minimum  
Minimum  
3'  
(1 m)  
3'  
(1 m)  
The diagrams that follow show the proper orientation  
using a pair of speakers for stereo sound, or several  
pairs of speakers for home theater sound.  
Minimum  
2' (.6 m)  
Minimum  
2' (.6 m)  
4
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PREPARATION  
Front of your home theater room  
Placing speakers for home theater  
Although these speakers are sold in pairs, you can use  
several pairs for home theater enjoyment.  
2'  
2'  
TV  
Minimum  
Minimum  
(.6 m)  
(.6 m)  
3'  
(1 m)  
3'  
(1 m)  
• Place two of the speakers:  
– with one on either side of your TV  
– with the arrow pointing to the opposite speaker  
– with each one AT LEAST:  
- 2 ft (.6 m) from the front wall  
- 3 ft (1 m) from the side walls  
- 6 ft (2 m) apart  
• Place the third speaker:  
– above the TV with the arrow pointing at the rear  
wall  
– at least 2 ft (.6 m) from the front wall  
• Place two other speakers:  
– to the left and right near the rear of the room  
3'  
3'  
2'  
(.6 m)  
2'  
(.6 m)  
– with the arrow pointing toward the side wall  
(away from the other speaker)  
(1 m)  
(1 m)  
Minimum  
Minimum  
– with each one AT LEAST:  
(Place the sixth speaker (for use with a 6.1 receiver,  
only):  
- 2 ft (.6 m) from the front wall  
- 3 ft (1 m) from the side walls  
- 6 ft (2 m) apart  
– between the other rear speakers  
– with the arrow pointing to the rear of the room  
– AT LEAST 2 ft (.6 m) from the rear wall  
Other considerations  
• Placing the provided template against your ceiling  
serves to determine the space needed for each  
speaker.  
• Using a stud finder is helpful in choosing a usable  
space between joists. You need to allow 51/2 in.  
(13 cm) from the center of the speaker to a joist.  
• If you are installing in a sealed space between joists, it  
is important to optimal performance that the volume  
of the space is at least 1 cubic foot (.028 m3).  
• Avoid all electrical wiring, vents, and plumbing pipes  
that are located above the ceiling. Check with a  
trained professional to learn how to locate and  
avoid them.  
5
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INSTALLATION  
Using the template  
1. Center the template on the spot where you want the  
Preparing the ceiling  
center of the speaker grille.  
Be sure you have read and understand all of the safety  
and preparation information on these pages so you can  
continue with confidence.  
2. Press the template to the ceiling with your hand or  
use painter’s tape to hold it in place.  
3. Trace around the edge of the template.  
CAUTIONS:  
• If you are unsure of your ability to complete this  
process, contact a professional installer.  
• Certain forms of insulation (such as horse hair plaster,  
newspaper, cellulose, or any blown-in materials) may  
pose a risk of ignition. Be sure to keep all insulation  
away from speakers in accordance with the installation  
instructions.  
CAUTION: DO NOT trace around or cut around the tabs  
that are for use only when the template serves as a paint  
shield.  
5
8 /8  
"
WARNINGS:  
(21.9 cm)  
• Make sure the spot chosen is safe for cutting. Do not  
cut through surfaces that may have hazards such as  
electrical wiring, conduits, or plumbing concealed  
behind them. Follow all other safety precautions.  
• If you believe there is asbestos insulation in the ceiling  
where you want to install a speaker, do not drill or cut  
there. Find a different ceiling area for the speakers  
instead.  
• If there is another type of moveable insulation in the  
ceiling, you can proceed after reading these tips:  
Drilling a pilot hole  
1. Choose the proper spade bit to drill a hole that is  
– You may need to cut or push the insulation away  
before inserting the speaker.  
large enough for the blade of your cutting tool.  
– Beware of hidden nails when reaching into the  
ceiling to remove insulation.  
WARNING: Use eye protection and be sure to observe all  
safety precautions while using a drill or cutting tool.  
– Wear gloves and protection for your mouth, nose,  
and eyes before handling insulation that contains  
fiberglass.  
– Be sure keep a 4-6 in. (10-15 cm) area around the  
speaker hole free from any types of insulation to  
maximize acoustic performance.  
2. Drill the hole inside the circle you have drawn.  
Choose a spot near the center or closer to the  
outside edge of the circle, depending on which  
will be easier when you begin to use your saw.  
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INSTALLATION  
Cutting the speaker hole  
Getting the wire ready  
Be sure to cut carefully to make the hole as regular as  
possible. However, when the speaker is in place, the  
frame overlaps the cutting edge by 5/8 in. (0.6 cm), which  
masks minor cutting inaccuracies.  
When your speaker cable is within reach of the hole you  
have cut, follow the procedure below:  
1. Push any insulation away from inside the speaker  
hole.  
1. Hold the cutting blade in a vertical position and keep  
Be sure that all blown insulation is at least 4 to 6 in.  
(10 to 15 cm) from the edges of the hole.  
it straight as you cut the hole.  
This helps prevent the blade from angling away from  
the outlined circle.  
2. Locate and pull out at least 14 in. (36 cm) of your  
speaker cable.  
Allow enough cable for where you stand to connect  
the wires.  
2. Insert the tip of your saw into the pilot hole and cut  
most of the way around the circular outline.  
3. Place one hand under the circle to brace it and  
complete cutting the hole.  
WARNING: Keep fingers away from the cutting blade.  
4. Remove the cutout section.  
5. Clear away any torn or rough material from around  
the hole.  
Such material can interfere with a tight seal between  
the speaker and the ceiling.  
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INSTALLATION  
Connecting the speaker  
Finishing the installation  
As you connect the wires, be careful to match the  
polarity of each wire to the proper terminal, as  
described below. An error here will adversely affect  
speaker performance.  
It is important to have all of your equipment ready and  
within easy reach to complete this procedure.  
Securing the speaker  
As you lift the speaker, keep the speaker cable above  
and out of the way to prevent pinching it.  
1. Choose the one wire on the cable end that is marked  
with a colored collar or other indicator, (which  
distinguishes it as the positive (+) wire.  
You may notice a security flange, located on the upper  
edge of the speaker, for use where local building codes  
require it.  
2. Notice the red circle on the exposed end of the  
positive (+) speaker terminal.  
1. Use two hands to hold the edge of the speaker as  
3. Compress both ends of the terminal and fully insert  
the bared tip of the positive wire into the terminal  
opening.  
you guide it into the ceiling hole.  
CAUTION: Be sure not to press on the two small drivers  
seated on the face of the speaker.  
Avoid inserting any insulated part of the wire.  
4. Release pressure on the terminal to capture the wire.  
5. Insert the other wire into the other terminal, marked  
with a black circle on the end to indicate it is  
negative (–).  
Security flange  
CAUTION: Do not allow exposed wires to brush against  
each other. This could damage your speaker or your  
receiver/amplifier. Trim any excess wire and reinsert it  
as necessary.  
Positive (+) wire  
to positive  
(red) terminal  
CAUTION: Be careful not to damage or remove any of  
the foam gasket material along the edge of the speaker.  
This gasket is important to the operation of the speaker.  
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INSTALLATION  
IMPORTANT CONSIDERATIONS:  
2. Tighten one of the four clamp screws until you  
can feel the frame press firmly against the ceiling.  
You can use a square-head or phillips-head screwdriver  
to tighten the screws on the speaker clamps. These  
clamps exert pressure inside the ceiling to hold the  
speaker firmly in place.  
This indicates that the clamp is extended and is  
gripping the ceiling.  
If you choose to use a screw gun or power drill with  
a square-head or phillips-head bit:  
• Select the lowest torque setting to begin.  
• If the screw does not seat properly, use the next  
highest torque setting to finish securing the screw.  
Or use a Phillips-head screwdriver to finish this  
manually.  
One of four  
clamp screws  
Clamp  
CAUTION: Tighten these screws firmly, but avoid using  
so much pressure that the clamps compress the ceiling  
material. This can cause the material to crumble, creating  
an uneven surface with gaps between the speaker face  
and the ceiling.  
3. Locate the clamp screw opposite the one that is  
tightened and repeat the process with this clamp.  
These two tightened clamps will hold the speaker  
in place temporarily.  
4. Repeat the process with the other two clamps to  
firmly secure the speaker to the ceiling.  
9
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INSTALLATION  
Testing each speaker  
With the speakers secured to your ceiling, you can  
make sure the speaker functions properly before you  
attach the grille.  
Attaching the grille  
The grille is designed to fit into the slots on the rim of  
the speaker and lock into place with a slight clockwise  
twist.  
1. Notice the six snaps along the inside edge of the  
CAUTION: Before you turn on your receiver/amplifier,  
be sure there is no unused speaker cable connected to it.  
An attached cable that is free at one end can cause a  
short and damage your receiver/amplifier.  
speaker grille.  
2. Position these snaps below the six slots along the  
rim of the speaker.  
Snap  
1. Turn on the receiver/amplifier and play a piece of  
music that is familiar to you.  
2. Make sure the sound is clear and free of static.  
Static may indicate that the speaker cable is not  
connected properly. Refer to the “CAUTION:” on  
page 8.  
Note: To remove the speaker and check the connections,  
loosen two of the screws that are opposite each other  
first. Use one hand to support the speaker as you loosen  
the third screw. Continue to support the speaker and  
carefully loosen the final screw.  
3. On the rim of the speaker, notice the six slots that  
the snaps fit into.  
Slot  
4. Press the grille onto the rim of the speaker until you  
feel the snaps engage and twist the grille slightly to  
lock the snaps securely.  
Bose®  
logo  
Note: If you find it difficult to twist the grille, use rubber  
gloves or place a piece of non-slip material over the grille  
to improve your grip.  
5. Rotate the Bose logo, as needed, to adjust it for  
your room layout.  
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REFERENCE  
Using a dry brush technique  
Painting the exterior parts  
Unthinned latex paint is appropriate for this method.  
Be sure to put down enough paper to cover your work  
area and allow for repeatedly blotting the brush.  
You can paint the grille and frame of your Virtually  
Invisible® 791 speakers before you install them.  
1. Dip the tip of a clean, dry brush in the paint.  
Be sure to use paint that is appropriate to the technique  
you choose, as described below. Painting is optional  
and Bose cannot be responsible for the quality of  
adhesion or finish of non-factory-applied paints.  
2. Stroke across a piece of paper to reduce the amount  
of paint on the brush. When you can see individual  
bristle marks, the brush is ready to use on the grille.  
WARNING: Follow all recommended safety procedures  
for the chemicals involved. This includes the proper use  
of eye protection, ventilation systems, respirators or filter  
masks, and fire safety equipment if flammable solvents  
are used.  
3. Stroke lightly back and forth on the front of the grille,  
in a horizontal direction, until you need more paint.  
Tip: If paint clogs any of the grille perforations, try  
angling your stroke or blow gently to unclog the paint.  
4. When the entire grille is covered, turn the grille 180°  
and repaint it using back-and-forth strokes.  
Painting the grille  
It is important to prevent paint from clogging the grille  
perforations. This can adversely affect performance.  
You can use a dry brush or spray paint technique, as  
described here. However, do not use a paint roller.  
• BE SURE to rotate the Bose® logo to the position you  
want before painting begins.  
• Clean the grille to remove possible contaminants.  
Even fingerprints can prevent uniform coverage.  
• Check to be sure the paint is distributed evenly and  
covers the grille thoroughly.  
• Use a tissue paper or clean cloth to protect the  
painted grille when you remove the paint shield or  
attach the grille to the speaker.  
11  
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REFERENCE  
Using a spray technique  
Painting the frame  
Before you begin, protect working parts of the speaker  
by inserting the template/paint shield that came in the  
carton.  
Latex or oil-based architectural paint requires thinning  
for use with a siphon-feed spray gun. Set the spray  
gun at 30 psi (2.1 bar) for application in a 3- to 5-in.  
(7.6-12.7 cm) fan pattern.  
Press the edges of the shield against the inside rim of  
the speaker until the tabs catch to hold the shield in  
place.  
The thinning formula depends on the type of paint you  
are using.  
• For use of vinyl acrylic latex paint, thin as follows:  
This protects working parts of the speaker and helps  
keep your paint edge even.  
To 6 parts of paint, add 3 parts of water and mix  
thoroughly. Add 1 part of denatured ethyl alcohol  
(which breaks down paint particles so they do not  
clog the grille) and mix again.  
Tab  
• For use of architectural or automotive paints:  
This type of paint should be used by a professional  
with the right equipment and technique. This paint  
also must be thinned, using a solvent.  
• For use of lacquer or enamel spray paint in a can:  
No further thinning is needed.  
Then:  
1. Suspend the grille or place it on a wire screen to  
prevent dirt or dried paint particles from blowing  
back into the perforations.  
You can use the same conventional spray or roller  
equipment used to paint your wall or ceiling and either  
latex or oil-based paints, which adhere to the speaker  
frame. However, both types of paint can be easily  
scratched through careless handling.  
2. Apply the paint to the grille surface at a 45° angle.  
Then rotate the grille by 180° and repaint it at 45°.  
CAUTION: Be careful so the paint does not puddle or  
run. You may want to use a brush for spreading paint  
where needed.  
3. Make sure the paint is dry before you attach the  
grille to the speaker.  
The paint may feel dry to the touch in a few minutes.  
However, if alcohol has been added, it may take  
several days to fully cure.  
180°  
45°  
45°  
Tip: To dislodge a paint clog, blow gently on the  
clogged area. If that does not work, immediately wash  
the grille with the appropriate solvent. Make sure the  
grille is thoroughly dry before repainting.  
Piercing a perforation with a sharp implement to remove  
a paint clog can cosmetically damage the grille and is  
not recommended.  
12  
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English  
TAB 2  
TAB 3  
TAB 4  
TAB 5  
TAB 6  
TAB 7  
TAB 8  
REFERENCE  
Troubleshooting  
Problem  
Possible solution  
The speakers do  
not play  
• Check the settings on your receiver/amplifier. Refer to the owner’s guide that came with it for  
instruction on settings.  
• If other stereo speakers are connected to a second set of audio outputs on your amplifier/  
receiver, make sure to select the proper A or B speaker setting to match the A or B outputs  
connected to your Virtually Invisible® 791 speakers.  
Only one speaker  
plays  
• Check the balance control on your receiver/amplifier and make sure it is centered.  
• Trace the cord from the speaker in question to the receiver/amplifier and make sure no wires  
from the + and – terminals on the receiver/amplifier are touching.  
• Disconnect the cord from the receiver/amplifier channel and reconnect it to a different  
receiver/amplifier channel.  
– If the performance is now fine, the problem lies in the original receiver/amplifier channel,  
the component source of the music, or the connections between the receiver/amplifier and  
the source. Check all of those to make sure they are performing properly. Reconnect the  
speaker to the proper channel of a functioning receiver/amplifier.  
– If the problem persists, its source is either the speaker wire or the speaker in question.  
Follow the next instruction.  
• Check the cable connected to the speaker in question to be sure that no wires from the +  
and – terminals are touching.  
• Disconnect the cord from the speaker in question and reconnect it to another speaker.  
– If the performance is now fine, the problem lies in the original speaker. Contact your  
authorized Bosedealer, who will arrange for service. Or, to contact Bose directly, refer  
to the address list included in the carton.  
– If the problem persists, its source is the speaker wires. Follow the next instruction.  
• Replace and re-run the speaker wire only after you have followed the procedure above  
and find no other source of the problem.  
The bass or treble  
is weak  
• Check the tonal balance setting on your receiver/amplifier.  
• Check for gaps between the speaker frame and the ceiling surface.  
• Trace the cord from the speaker in question to the receiver/amplifier and switch the wires  
connected to the + and – terminals at that end.  
– If this strengthens the bass performance, the problem was caused by inconsistent polarity  
of the connections made at either end of the cable.  
• Disconnect the cord from the receiver/amplifier channel and reconnect it to a different  
receiver/amplifier channel.  
Static or noise from • Trace the cord from the speaker in question to the receiver/amplifier. Make sure the wires are  
one speaker  
in good condition, are firmly connected, and are not touching across terminals.  
• Check the connections from the source of the music to the receiver/amplifier.  
• Unscrew the speaker clamps and remove the affected speaker to reveal the cable. Make  
sure the wires are in good condition, are firmly connected, and are not touching across  
terminals.  
• If the previous efforts do not solve the problem, refer to the proposed solutions for “Only one  
speaker plays” above.  
13  
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TAB 8  
TAB 7  
TAB 6  
TAB 5  
TAB 4  
TAB 3  
TAB 2  
English  
REFERENCE  
Customer service  
Technical information  
For additional help in solving problems, contact your  
Bose dealer. Or, to contact Bose® Customer Service,  
refer to the address list included in the carton.  
Compatibility  
• Compatible with amplifiers or receivers rated  
10-100W per channel/rated 4 to 8 ohms  
• 50W IEC continuous power handling; rated 6 ohms  
Limited warranty  
Driver complement  
Your Virtually Invisible® 791 speakers are covered by a  
limited transferable warranty. Details of the limited  
warranty are provided on the product registration card  
that is included in the carton. Please refer to the card for  
instructions on how to register. Failure to register will  
not affect your limited warranty rights.  
• Two (2) 1" (2.54 cm) dome tweeters configured in  
an array  
• One (1) 7" (17.8 cm) high-excursion woofer  
Material  
• Molded ABS engineering-grade polymer  
• White frame and grille  
What you must do to obtain Limited  
Warranty service  
Return the product, with proof of purchase from an  
authorized Bose dealer, using the following procedures:  
Dimensions  
• Diameter of each speaker: 10 in. (25.4 cm)  
• Depth, with grille on: 4.66 in. (12 cm)  
• Ceiling hole diameter required: 85/8" (21.9 cm)  
diameter  
1. Contact the Bose organization in your country/  
region (visit Global.Bose.com for contact information  
in your country/region) for specific return and ship-  
ping instructions.  
• Finished surface required 10 in. (25.4 cm)  
Weight  
• 4.73 lb (2.2 kg) each  
2. Label and ship the product, freight prepaid, to the  
address provided by the Bose organization in your  
country.  
3. Place any necessary Return Authorization Number  
prominently on the outside of the carton. Cartons  
not bearing a Return Authorization Number, where  
required, will be refused.  
Accessories  
For unfinished construction, use the Bose Rough-in Kit.  
The kit contains parts for two speakers and is designed  
for installation after the joists are in place and before  
wallboard is added. When installed, the kit reserves a  
place for each speaker and indicates where to make the  
speaker hole in the wallboard. The kit includes installa-  
tion instructions.  
For further information or to order accessories, contact  
your Bose dealer. Or, to call Bose directly, refer to the  
address list included in the carton.  
14  
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©2009 Bose Corporation, The Mountain,  
Framingham, MA 01701-9168 USA  
AM321052 Rev.01  
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