Hi, I recently purchased a new SC20H - serial number starts with M-2022.
Fantastic amp except I seem to have the same noisy / popping fx loop problem that (now that I have done some research) seems to be quite common.
I have tried all the cable switching / buffered / non buffered / true bypass pedal combinations, different wattage, plugged in, not plugged in etc. regardless of combination - when you press the loop switch it pops and raises the noise floor so it sounds as if you have engaged a noisy overdrive.
Is this simply a design flaw or a faulty unit? I read that it was a problem when it was released but the newer ones were supposed to address this?
Cheers,
Dylan
Hi Dylan,
We would suggest having the amp looked at, please contact the shop where you purchased and they can arrange that for you.
Regards
Marshall Support