Bose L1 II Notice D'utilisation page 22

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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 or B2 bass module
sounds out of balance with
the system
No mid/high sounds heard
model II 
®
from the L1
loudspeaker
Instrument or audio source
sounds distorted
Third-party-powered
subwoofer sounds poor
when connected to the
Bass - Line Out connector
on the power stand
B1 or B2 bass modules
powered by a third-party
power amplifier and con-
nected to the Bass - Line
Out connector sounds
poor
Microphone is 
encountering feedback
22
Italiano Français Svenska
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 bass module cable.
• Make sure the 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 bass module.
• Make sure your power stand firmware is up to date.
• Make sure you are using the bass module 4-wire cable included with the bass module
package.
• Make sure that the bass module grille is facing forward toward the musicians and
audience.
• Make sure the L1 model II top and bottom arrays 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.
• Unplug any Bose bass modules that may be connected to the power stand.
• The signal from the Bass - Line Out may be too high for the powered subwoofer; try
attenuating the signal using commercially available direct boxes or in-line pad devices.
• Try different connections to the third-party-powered subwoofer, such as balanced or
unbalanced cabling and/or a direct box.
• Check that the gain and input controls on the third-party-powered subwoofer are set
appropriately.
• If using a powered subwoofer with an adjustable crossover, set the crossover to 180Hz.
• Ensure that at least two B1 or B2 bass modules are directly connected to the Bass
Module Out connector on the power stand using a bass module 4-wire cable.
• Check the gain settings on the third-party power amplifier. The volume level of the bass
modules powered by the power stand should be similar to the bass modules powered
by the external amplifier.
• Orient the microphone so that it is not pointing directly at its respective L1 model II top
and bottom array loudspeaker.
• 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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