Bose L1 Notice D'utilisation page 20

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C M
ARE AND AINTENANCE
Problem
With nothing plugged into
the power stand, a slight
hum or buzz is heard
B1 or B2 bass module is
plugged in, but no bass
audio is heard
B1 bass module sounds
out of balance with the
system
No mid/high sounds heard
from the L1 ® top array
Instrument or audio source
sounds distorted
Microphone is 
encountering feedback
20
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What to do
• Using an AC outlet tester, test the AC outlet that the power stand is plugged into for
reversed or open (hot, neutral, and/or ground) contacts.
• If using an extension cord, make sure that the cord is also tested as above.
• Make sure you are using the included 4-wire B1/B2 bass module cable.
• Make sure the B1 or B2 bass module cable is plugged into the Bass Module Out
connector and the cable plug is fully engaged in the connector.
• Try a different 4-wire cable.
• If available, try a different B1/B2 bass module.
• Make sure you are using the B1/B2 bass module 4-wire cable included with the B1 bass
module package.
• Make sure that the B1 or B2 bass module grille is facing forward toward the musicians
and audience.
• Make sure the L1 top array and bottom extension are firmly seated in their connectors.
• Make sure connections are not bent or broken.
• Try cleaning the contacts on the loudspeaker top and bottom with electronic contact
spray cleaner.
• Make sure the Signal/Clip LED is not constantly red. If it is, lower the trim level.
• Try a different source or instrument.
• Try your source or instrument on another power stand.
• Orient the microphone so that it is not pointing directly at its respective L1 system.
• Try a different microphone.
• Try a different position for the loudspeaker and/or vocalist on stage.
• Increase the distance from the loudspeaker to the microphone.
• If using a vocal effects processor, make sure it is not contributing to the feedback 
problem.
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