Bose Complete Guide to Care and Troubleshooting for Your Speaker System

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CARE AND MAINTENANCE
Problem		What to do
With nothing plugged into		• Using an AC outlet tester, test the AC outlet that the power stand is plugged into for
the power stand, a slight		reversed or open (hot, neutral, and/or ground) contacts.
hum or buzz is heard		• If using an extension cord, make sure that the cord is also tested as above.
B1 bass module is plugged		• Make sure you are using the included 4-wire B1 bass module cable.
in, but no bass audio is		• Make sure the B1 bass module cable is plugged into the Bass Module Out connector
heard		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	• Make sure you are using the B1 bass module 4-wire cable included with the B1 bass
out of balance with the	module package.
system	• Make sure that the B1 bass module grille is facing forward toward the musicians and
	audience.
No mid/high sounds heard	• Make sure the L1 model II Cylindrical Radiator® loudspeaker top and bottom are firmly
from the L1TM model II	seated in their connectors.
Cylindrical Radiator®	• Make sure connections are not bent or broken.
loudspeaker	• Try cleaning the contacts on the loudspeaker top and bottom with electronic contact
	spray cleaner.
Instrument or audio source	• Make sure the Signal/Clip LED is not constantly red. If it is, lower the trim level.
sounds distorted	• Try a different source or instrument.
	• Try your source or instrument on another power stand.
Third-party-powered sub-	• Unplug any B1 bass modules that may be connected to the power stand.
woofer sounds poor when	• The signal from the Bass - Line Out may be too high for the powered subwoofer; try
connected to the Bass -	attenuating the signal using commercially available direct boxes or in-line pad devices.
Line Out connector on the	• Try different connections to the third-party-powered subwoofer, such as balanced or
power stand
	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	• Ensure that at least two B1 bass modules are directly connected to the Bass Module
by a third-party power	Out connector on the power stand using a B1 bass module 4-wire cable.
amplifier and connected to	• Check the gain settings on the third-party power amplifier. The volume level of the B1
the Bass - Line Out	bass modules powered by the power stand should be similar to the bass modules pow-
connector sounds poor
	ered by the external amplifier.
Microphone is	• Orient the microphone so that it is not pointing directly at its respective L1 model II
encountering feedback	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.

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