LI M2 makes loud buzz and loses volume/clarity with B2 connected

My L1M2 just started buzzing/loud hum when I connect the B2 to the power stand.  I tried switching out the speak-on cable and also tried it with another B2 unit.  The problem continues.  IF I disconnect the B2 with the power stand turned on, the buzzing stops.  The buzzing occurs with or WITHOUT a tone match connected.  The power stand firmware is 1.4.   

Hi Rotnick,

I'm sorry you are getting a buzzing/loud hum when you connect the B2 to the L1 Model II Power Stand.

You've done some great troubleshooting and diagnostics. 

If I read your post correctly, you get the buzz with both B2s (you can swap them and you still get the buzz), and you've also swapped the B2 cables.

Rotnick posted:

My L1M2 just started buzzing/loud hum when I connect the B2 to the power stand.  I tried switching out the speak-on cable and also tried it with another B2 unit.  The problem continues.  IF I disconnect the B2 with the power stand turned on, the buzzing stops.  The buzzing occurs with or WITHOUT a tone match connected.  The power stand firmware is 1.4.   

It sounds like the L1 Model II Power Stand will have to be serviced.

Please call Bose Support.

Bose® Product & Technical Support at (877) 335-2673
(U.S. and Canada only)
Monday-Friday: 9:00 AM - 9:00 PM ET
Other regions

Thanks,

ST