Bose L1 User Manual Page 28

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20
C
ARE AND MAINTENANCE
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With nothing plugged into
the power stand, a slight
hum or buzz is heard
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.
B1 bass module is plugged
in, but no bass audio is
heard
Make sure you are using the included 4-wire B1 bass module cable.
Make sure the B1 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 bass module.
B1 bass module sounds
out of balance with the
system
Make sure you are using the B1 bass module 4-wire cable included with the B1 bass
module package.
Make sure that the B1 bass module grille is facing forward toward the musicians and
audience.
No mid/high sounds heard
from the L1
TM
model II
Cylindrical Radiator
®
loudspeaker
Make sure the L1 model II Cylindrical Radiator
®
loudspeaker top and bottom 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.
Instrument or audio source
sounds distorted
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.
Third-party-powered sub-
woofer sounds poor when
connected to the Bass -
Line Out connector on the
power stand
Unplug any B1 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.
B1 bass modules powered
by a third-party power
amplifier and connected to
the Bass - Line Out
connector sounds poor
Ensure that at least two B1 bass modules are directly connected to the Bass Module
Out connector on the power stand using a B1 bass module 4-wire cable.
Check the gain settings on the third-party power amplifier. The volume level of the B1
bass modules powered by the power stand should be similar to the bass modules pow
-
ered by the external amplifier.
Microphone is
encountering feedback
Orient the microphone so that it is not pointing directly at its respective L1 model II
Cylindrical Radiator
®
loudspeaker.
Try a different microphone.
Try a different position for the loudspeaker and/or vocalist on stage.
Increase the distance from the loudspeaker to themicrophone.
If using a vocal effects processor, make sure it is not contributing to the feedback
problem.
Problem What to do
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