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Problem

B1 bass module sounds

out of balance with the

system

No mid/high sounds heard

from the L1 model I

Cylindrical Radiator

loudspeaker

System momentarily mutes

when changing presets or

plugging/unplugging the

B1 bass module

Microphone sounds

distorted

One of the four

instruments plugged into

the L1 model I power stand

is at a lower volume than

the others

Line OUT signals on

channels 1 and 2 are very

loud when connected to

another L1 model I power

stand or a mixer with only

mic-level input

Line OUT signals on

channels 1 and 2 are very

noisy

Third-party powered sub-

woofer sounds poor when

connected to the Bass -

Line OUT connector on

the L1 model I power stand

B1 bass modules powered

by a third-party power

amplifier and connected to

the Bass - Line OUT

connector sounds poor

What to do

• Make sure you are using the (blue) 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.

• Make sure L1 model I Cylindrical Radiator

connectors.

• Make sure connections are not bent or broken.

• Try cleaning the contacts on the L1 model I Cylindrical Radiator™ loudspeakers with

electronic contact spray cleaner.

• This is a feature of the L1 model I power stand that allows the user to hear that internal

changes have been made.

• Make sure the red clip light is not constantly on. If it is, lower the trim.

• Try a different microphone.

• Try your microphone on another L1 model I power stand.

• If the instrument is plugged into Channel 3/4, use a direct box or high-to-low

transformer (high impedance instruments, such as non-active guitars or basses, are not

designed to be plugged directly into a low impedance input).

• If the instrument's volume is still lower than the others, try a similar instrument in the

same channel. If this solves the problem, your instrument may not be working correctly.

• The Line OUT jack operates at a +4dBu professional line level; it is meant to connect to

compatible mixing consoles.

• Use inline pads to reduce the signal gain to a manageable level.

• Line OUT is not meant to be used with L1 model I power stands. Some advanced

configurations are detailed online at www.Bose.com/musicians.

• Check to make sure that the receiving device (mixer) is set up to receive a +4dBu level

signal.

• Try powering the receiving device from the same outlet as the L1 model I power stand.

• Try using an XLR ground-lift barrel adapter or direct box.

• Unplug any B1 bass modules that may be connected to the L1 model I 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 bass modules are powered directly from the L1 model I

power stand (connected to the L1 model I power stand's B1 Bass Module jack) and

using the (blue) 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 L1 model I power stand should be similar to the bass

modules powered by the external amplifier.

loudspeakers are firmly seated in their

ROUBLESHOOTING