Bose Speaker 791 User Guide page

Installation Guide  
Guía de instalación  
Notice d’installation  
Telepítési útmutató  
Guida di installazione  
Podręcznik instalacji  
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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.  
• 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  
• 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  
• Consult local building codes before you get started with this  
• 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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Basic steps to installation  
The instructions on the pages that follow will help you  
complete each of the steps below.  
Step 1:  
Placing speakers for stereo sound . . . . . . . . . .  
Choose approximate locations for each  
Step 2:  
Observe the cautions and use the template  
for precise placement.  
Step 3:  
Cut the hole for each speaker.  
Step 4:  
Wire each speaker.  
Step 5:  
Insert and secure the speaker in the ceiling.  
Step 6:  
Test each speaker to make sure it works.  
Securing the speaker . . . . . . . . . . . . . . . . . . . .  
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14  
Technical information . . . . . . . . . . . . . . . . . . . . . 14  
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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  
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  
drill bit  
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  
or Phillips-head  
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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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  
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  
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.  
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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  
location for each speaker. Before you mark the location  
– oriented with the arrow pointing to the opposite  
– 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  
2' (.6 m)  
2' (.6 m)  
Guide arrow  
(1 m)  
(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.  
2' (.6 m)  
2' (.6 m)  
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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.  
(.6 m)  
(.6 m)  
(1 m)  
(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  
– 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  
(.6 m)  
(.6 m)  
– with the arrow pointing toward the side wall  
(away from the other speaker)  
(1 m)  
(1 m)  
– with each one AT LEAST:  
(Place the sixth speaker (for use with a 6.1 receiver,  
- 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  
• 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.  
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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.  
• 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  
CAUTION: DO NOT trace around or cut around the tabs  
that are for use only when the template serves as a paint  
8 /8  
(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  
• 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  
– 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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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  
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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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  
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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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  
One of four  
clamp screws  
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.  
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