wjchan
When I powered on my left CAT12 today, it made a couple of loud pops and now it only makes a high-pitch (1kHz?) tone. It doesn't matter if I mute CH1/2/3 or turn up or down the volume control on the CAT12. It emits the same high pitch tone. This high pitch happens even when there's the input is unplugged.

Is this an amplifier issue?

--wilson
Quote 0 0
Mark_Seaton
Hi Wilson,

That sounds like a pretty certain amplifier issue. If you could email us at the sales@seatonsound.net with the serial # of the bad unit, Kelly or I will get packing and a shipping label on its way to you when we are back in the office tomorrow.
Mark Seaton
Seaton Sound, Inc.
sales@seatonsound.net
773-290-8436
Quote 0 0