Its a piece of low budget junk to begin with. And I bought it used. Drive 30w combo. But for the first 3 months I had it, it was fine, had nice volume, all the eq settings worked well. Its the reason I bought it, it was cheap and performed. Then one day it starts farting and seemingly in some cases gets muffled like it cant pickup the proper signal from the bass. If I turn up the bass and mid controls it will fart. If I keep them low its okay. But then the quality I want isnt there. I took it apart today to see if something was loose or corroded or dirty. No problems. Its probably going in the trash soon as soon as I get my other rig paired up with a head. But I am curious as to what factors cause an amp to start doing this? Maybe the tone and volume pots failing?