Bang & Olufsen BeoLab 12-3, Service Manual

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2.4 Troubleshooting
Test - Sound
It is possible to test each speaker unit/amplifier to check the sound quality, and
determine whether the devices are faulty or healthy. For this purpose use ServiceTool
and refer to the test section.
The Test Sound section features a sound generator which allows the user to send
a pure sound directly to the speaker unit. This feature makes troubleshooting or
testing more easy and targeted.
For use simply choose a sound frequency and an output amplifier to activate the
test function.
Woofer 1
Woofer 2
Midrange
Tweeter
I/O