Hi,

Can you make sure the speaker wires are not touching each other where they connect at the rear of the speakers. This would cause them to shorten out when demand is put on them.

Also, when you say at moderate volume levels it works ok. Are you trying to get too much volume out of the unit?

You can also give Panasonic Consumer products a call for other ideas 800-211-7262.

If these do not help, please get back with us.

Warren Neumeister
PC Connection
pcconnection.com