Did a bit of clean up, pot, circuits, etc. All cables well in place... It's even worse, had to put on earplugs to do the testing. Looks well beyond my abilities, I'm giving up.   Thanks for the help though.

Thanks for the reply.   I changed the main fuse, but no impact.

Then that's not it... I've browsed the internet extensively about A5 problems and I've never run into anything like you mention.    Sounds like your speaker/amp has a problem with some frequency ranges ? I'm no expert but maybe you could try to play all ranges (with a virtual keyboard or...

Does the problem also occur if you push up the A5's volume knob (and turn down the source's) ? A5s seem to very frequently have a balance problem, with the left speaker having a lower output at lower amp volume. Mine are balanced only if I push the knob above 10 o'clock.

Hi and thanks for reading   I've had a pair of A5 for about 4 years now. A few months ago I noticed there was a bit of crackling, that wouldn't go away if I unplugged the source. More white noise than usual too. It got louder, I got sound like somebody's blowing in a mike, and then pops...