I have a set of BeoLab Penta 2 speakers. I have had them connected to a BeoCenter 2500 and they have been working fine. I just connected them to my BeoCenter 9500 and when I turn the 9500 off the BeoLabs give a loud pop/crack?

What could be causing this?

They seem to be fine other than when turning them off?

They did not do this when connected to the 2500.

I just have them setup the same as when connected to the 2500. A PL cable to each speaker from the 9500, the speakers set to left and right and set to PL input.

 

Thanks