Bose® 791 Guía De Instalación Rápida

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 Bose

 

dealer, 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 
one speaker

• Trace the cord from the speaker in question to the receiver/amplifier. Make sure the wires are 

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.

00_791_Speaker_IG.book  Page 13  Wednesday, April 15, 2009  8:33 AM