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Bose Virtually Invisible 791 in-ceiling speakers II Owner’s Guide

Bose Virtually Invisible 791 in-ceiling speakers II feature

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Bose Virtually Invisible 791 in-ceiling speakers II

Bose Virtually Invisible 791 in-ceiling speakers II product

About Bose
Bose is a company that designs and manufactures audio equipment, including speakers, headphones, and home theater systems. The company was founded in 1964 by Dr. Amar G. Bose, an MIT professor, and audio engineer. Bose is known for its high-quality sound systems and innovative technology. The company also sells automotive sound systems, professional audio equipment, and noise-canceling technology.

Important Safety Instructions

Please read this owner’s guide carefully and save it for future reference.


  • Do not place naked flame sources, such as lighted candles, on or near the product.
  • All Bose products must be used in accordance with local, state, federal and industry regulations. It is the installer’s responsibility to ensure the in-ceiling installation of the loudspeakers and mounting system is preformed in accordance with applicable building codes, including local building codes and regulations.
  • Unsafe mounting or overhead suspension of any heavy load can result in serious injury and equipment damage. It is the responsibility of the installer to evaluate the reliability of any mounting method used for application.


  • These Bluetooth speakers are not designed or recommended for in-ceiling installation or in walls, in-ceilings of masonry, or in drop ceilings.
  • This product is not intended for use in Air-Handling Plenum Spaces.
  • 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 Bluetooth speakers in accordance with the installation instructions in this guide.

Contains small parts which may be a choking hazard. Not suitable for children under age 3.

This product contains magnetic material. Contact your physician if you have questions on whether this might affect the operation of your implantable medical device.

This product must be used indoors. It is neither designed nor tested for use outdoors, in recreational vehicles, or on boats.

Important safety instructions

  1. Read these instructions.
  2. Keep these instructions.
  3. Heed all warnings.
  4. Follow all instructions.
  5. Do not use this apparatus near water.
  6. Install in accordance with the manufacturer’s instructions.
  7. Do not install near any heat sources, such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat.
  8. Only use attachments/accessories specified by the manufacturer.

This symbol means the product must not be discarded as household waste, and should be delivered to an appropriate collection facility for recycling. Proper disposal and recycling helps protect natural resources, human health and the environment. For more information on disposal and recycling of this product, contact your local municipality, disposal service, or the shop where you bought this product. Bose Corporation hereby declares that this product is in compliance with the essential requirements and other relevant provisions of Directive 1999/5/EC and all other applicable EU directive requirements. The complete declaration of conformity can be found at:

China Importer: Bose Electronics (Shanghai) Company Limited, Part C, Plan 9, No. 353 North Riying Road, China (Shanghai) Pilot Free Trade Zone
EU Importer: Bose Products B.V., Gorslaan 60, 1441 RG Purmerend, The Netherlands
Taiwan Importer: Bose Taiwan Branch, Room 905, 9F, Worldwide House, 131 Min Sheng East Rd, Section 3, Taipei, Taiwan, 105

Date of manufacture:
The first bolded digit in the serial number indicates the year of manufacture; “5” is 2005 or 2015.


About your Virtually Invisible 791 series II or 591 in-ceiling speakers

The Bose Virtually Invisible 791 series II or 591 in-ceiling speakers provide superior performance for built-in stereo music listening and home theater enjoyment.


Carefully unpack the carton and confirm that the following parts are included:

Bose Virtually Invisible 791 in-ceiling speakers II fig-1JPG

If part of the system is damaged, do not use it. Contact your authorized Bose dealer or Bose customer service. Refer to the contact sheet in the carton.

Recommended tools

You may need the following tools to complete the in-ceiling installation:

Bose Virtually Invisible 791 in-ceiling speakers II fig-2

Speaker wire requirements

Gauge Maximum Length
18 AWG (0.82 mm2) 20 ft. (6 m)
16 AWG (1.3 mm2) 30 ft. (9 m)
14 AWG (2.1 mm2) 50 ft. (15 m)
12 AWG (3.3 mm2) 90 ft. (27 m)
  • Allow enough wire from the ceiling to wire the speakers before installing.
  • Strip ½ in. (13 mm) of insulation at each end of both wires.
  • Please check your local building codes and use only the correct type of wire required for in-ceiling installation.
  • For information on installing speaker wire, consult a professional electrician or audio/video installer.

Placement guidelines

For optimal stereo performance, install the Bluetooth speakers in positions similar to the diagram below at a minimum of the suggested distances:

Bose Virtually Invisible 791 in-ceiling speakers II fig-3


  • Use a stud finder to ensure the speaker hole is at least 4¾ in. (12 cm) away from a joist.
  • Mount these speakers in a wood frame or similar construction only. Bose recommends installing these speakers only in a wood frame or similar construction with adequately spaced studs, as found in 2 x 6 construction.

Placement in unfinished construction
If you are planning an in-ceiling installation in unfinished construction, purchase the Bose rough-in kit. See “Accessories” on page 7.

Cutting the speaker hole

  1. 1. Trace the template in the speaker location. Bose Virtually Invisible 791 in-ceiling speakers II fig-4
    WARNING: Do not cut into surfaces that have hazards concealed behind them such as electrical wiring or plumbing. If you are unsure of your ability to mount this speaker, contact a professional installer.
  2. Drill a hole inside the template area large enough for your cutting tool.
  3. Cut along the line you traced. Bose Virtually Invisible 791 in-ceiling speakers II fig-5
  4. Remove the cutout section.
  5. Clear away any torn or rough material from around the hole.

Connecting the speaker wire

  1. Pull out at least 14 in. (36 cm) of the speaker wire. Allow enough wire to connect the speaker from where you are standing. Bose Virtually Invisible 791 in-ceiling speakers II fig-6
  2. Connect the positive wire to the red-marked terminal on the speaker.
    Note: The terminal marking is located on the top of the terminal. Bose Virtually Invisible 791 in-ceiling speakers II fig-7
  3. Connect the negative wire to the black-marked terminal on the speaker.

Installing the speaker

  1. Holding the outside edges, insert the speaker into the hole.
    Note: Do not press on the two small drivers on the face of the speaker. This may damage the speaker. Bose Virtually Invisible 791 in-ceiling speakers II fig-8
    CAUTION: Certain forms of insulation (such as horse hair plaster, newspaper, cellulose, or blown-in materials) may pose a risk of ignition. Be sure to keep all insulation away from the speakers.
  2. Tighten all the clamp screws with a Phillips head screwdriver.
    Note: If using a power drill, choose the lowest torque setting. Bose Virtually Invisible 791 in-ceiling speakers II fig-9

Attaching the grille

The grille magnetically attaches to the rim of the speaker. Place the grille on speaker.

Bose Virtually Invisible 791 in-ceiling speakers II fig-10

Painting the grille
You can paint the speaker grilles before you attach them to the speaker. Bose is not responsible for the quality of adhesion or finish of non-factory-applied paints.

  • Latex or oil-based architectural paint requires thinning for use with a siphon-feed spray gun. Refer to the owner’s guide provided with your spray gun for guidelines.
  • Be careful when using a sharp implement in the grille perforations to remove a paint clog, which can damage the grille.


Problem What to do
No sound from speakers •  Ensure the speaker wires did not disconnect from the speakers or the receiver/amplifier.


•  Check the settings on your receiver/amplifier. Refer to the receiver/amplifier owner’s guide for instructions on settings.

•  If other stereo speakers are connected to a second set of audio outputs on your receiver/ amplifier, select the proper A or B speaker setting to match the A or B outputs connected to your speakers.

Sound from one speaker only •  Center the balance control on your receiver/ amplifier.


•  Ensure no wires from the positive and negative terminals on the receiver/amplifier are touching.

•  Disconnect the speaker wire from the receiver/ amplifier channel and reconnect it to a different channel.

•  Check that no wires from the positive and negative terminals are touching where the speaker wire connects to the speaker.

•  Disconnect the speaker wire from the speaker and reconnect it to another speaker. If this speaker works, your speaker needs to be serviced. Refer to the contact sheet in the carton.

•  Replace and re-install the speaker wire if these troubleshooting steps do not solve the problem.

Bass/treble is weak •  Adjust the tonal balance setting on your receiver/amplifier.


•  Ensure there are no gaps between the speaker frame and the wall surface.

•  Switch the wires connected to the positive and negative terminals on the receiver/amplifier.

•  Disconnect the speaker wire from the receiver/ amplifier channel and reconnect it to a different channel.

Static/noise from speaker •  Ensure the wires are in good condition, are firmly connected to the speaker and receiver/amplifier and are not touching across terminals.


•  Connect the music source to the receiver/amplifier properly.

•  See “Sound from one speaker only”.


For unfinished construction, use the Bose rough-in kit. The kit contains parts for two speakers and is designed for in-ceiling installation after the joists are in place and before the wallboard is added. When installed, the kit reserves a place for each speaker and indicates where to make the speaker hole in the wallboard. For more information or to order accessories, contact Bose customer service. Refer to the contact sheet in the carton.

Customer service

For additional help using the system:

  • Visit owners.Bose.com
  • Contact Bose Customer Service. Refer to the contact sheet in the carton.

Limited warranty

Your system is covered by a limited warranty. Details of the limited warranty are provided on the product registration card that is in the carton. Please refer to the card for instructions on how to register. Failure to register will not affect your limited warranty rights. The warranty information provided with this product does not apply in Australia and New Zealand. See our website at www.Bose.com.au/warranty or www.Bose.co.nz/warranty for details of the Australia and New Zealand warranty.

Technical information

  • Compatibility
    • Compatible with amplifiers or receivers rated 10-100W per channel/rated 4 to 8 ohms
    • Virtually Invisible 791 series II: 50W IEC continuous power handling; rated 6 ohms
    • Virtually Invisible 591: 50W IEC continuous power handling; rated 8 ohms
    • Virtually Invisible 791 series II driver complement: Two 1″ (25.4 mm) dome tweeters configured in an array One 7″ (178 mm) high-excursion woofer
  • Virtually Invisible 591 driver complement:
    • Two 3⁄4″ (19 mm) dome tweeters configured in an array
    • One 5″ (127 mm) high-excursion woofer
  • Virtually Invisible 791 series II dimensions:
    • Diameter: 8.4″ (214 mm)
    • Depth into the ceiling: 4.14″ (105.2 mm)
    • Grille diameter: 10″ (254 mm)
    • Ceiling hole diameter: 85⁄8″ (219 mm)
  • Virtually Invisible 591 dimensions:
    • Diameter: 6.5″ (166 mm)
    • Depth into the ceiling: 3.8″ (96.7 mm)
    • Grille diameter: 8.11″ (206 mm)
    • Ceiling hole diameter required: 6.7″ (170 mm) diameter
  • Weight
    • Virtually Invisible 791 series II: 4.8 lb. (2.18 kg) each
    • Virtually Invisible 591: 3.19 lb. (1.45 kg) each

©2017 Bose Corporation, The Mountain, Framingham, MA 01701-9168 USA AM750575 Rev. 02

FAQs About Bose Virtually Invisible 791 in-ceiling speakers II

What is Bose 791’s frequency response?

40Hz to 16kHz is the frequency response. The bi-directional tweeters provide decent bass given their size and do a fantastic job of filling out a large room.

To what are ceiling speakers required?

An external amplifier that is wired via speaker cable to each ceiling speaker is required to power all of the ceiling speakers. The Sonos Amp is the greatest multi-room option, in our opinion.

Where should ceiling speakers be placed?

how to hang speakers from the ceiling. To ensure a balanced sound, your in-ceiling speakers should be distributed evenly across the space. A single ceiling speaker could be adequate in a compact area. For the optimum sound dispersion in this scenario, position the speaker as close to the room’s centre as you can.

Can two Bose speakers be connected to one another?

Several Bose smart speakers can be grouped using the Bose Music app. You may combine your Bose smart speakers so they all play the same sound if you have more than one that is compatible with the Bose Music app.

What frequency works best for Bluetooth speakers?

The sound quality of a Bluetooth speaker is the most crucial feature to consider. The overall harmonic distortion, which should be less than 1%, must be taken into consideration in order to determine the audio quality. The frequency range, which should be between 100Hz and 20kHz, should also be taken into consideration.

What are the benefits of ceiling speakers?

Ceiling speakers may communicate exquisitely detailed music from overhead and even improve the surround sound of your speakers, despite their comparatively small size. Why not add a few to your home? Theaters even employ them to enhance the surround sound experience.

Are ceiling speakers Bluetooth compatible?

The simplest method to add music to your space is with active ceiling speakers. For instance, the Lithe Audio Bluetooth ceiling speaker features a 6.5″ speaker with a 50W amplifier and Bluetooth receiver built-in.

How many ceiling speakers are required for each space?

As a general rule, use one pair of ceiling speakers in spaces larger than 3 m2, and two pairs in spaces larger than 5 m2 for a more well-balanced sound.

How far away from the ceiling should speakers be?

from 18 to 24 inches

Can I connect a lot of devices to my Bose speaker?

When turned on, the speaker immediately establishes connections with the two most recent devices connected (if they are powered on and in range). By stopping the first device and then playing from the second when two devices are connected, you can play music from either device.

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