Thanks Pmotz. The situation has worsened, unfortunately--it no longer pops, it tears. Must be one dirty potentiometer. I shut down the system and will take the amp in for service.
Speakers pop when volume knob is turned
I have a MF A300 connected to a pair of Thiel 1.5s. The amp is also connected to a REL subwoofer via its high level Neutrik Speakon cable. Problem is, and this has just developed, my speakers "pop" or "crackle" when the volume knob is turned--no music playing, just the turning the knob. Is this normal? I never heard it before. Should I just play ignorant and just not turn the knob without music. Or is the pop indictitive of some impending failure in the amp?