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Sound is not heard from all speakers | Virtually Invisible® 791 Series II in-ceiling speakers
Be sure the speakers are connected properly to the receiver.
Check the speaker wire connections so they are wired properly and firmly to the positive and negative terminals. There should be no exposed wires as this risks damaging the receiver or tripping its circuit protection mode. Also, be sure the proper set of speaker terminals are being used; many receivers have an "A Speaker" and "B Speaker" section. See the receiver's owners guide for more information.
Be sure the proper speakers are selected.
Many receivers have outputs for "A Speakers" and "B Speakers." If the Bose speakers are connected to a set of outputs that are not selected, they will not play
Try a different audio device.
Connect and play another audio device through your product. This can help determine if the issue is isolated to the first device.
Check the balance level on your receiver.
The receiver balance level may be adjusted incorrectly. Be sure it is set to a middle level.
In the receiver menu, check for individual speaker volume adjustments.
Many receivers let you individually adjust the volume heard from each speaker. In the receiver menu, look for and adjust applicable audio settings as needed. See the receiver's owners guide for more information.
Check the condition of the speaker wires and be sure they are secure at both ends.
Check the speaker wires for any kinks, scratches, cuts or damage. Replace any damaged wires and check that they are securely connected at both ends.
Switch the speaker wires on the output of the receiver.
At the back of the receiver, switch the connection of the speaker wire that may not be working properly with one that is working properly. If the problem stays with the same speaker, the speaker wire is defective. Replace the speaker wire. If the problem does not stay with the same speaker, contact the manufacturer of the receiver for assistance
Try switching the speaker:
Swap the speaker that isn’t working with one that is. If the issue follows the same speaker, it may need service. Scroll down and click "Start a repair or replacement" to explore your options.
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