Exactly as the title states. Just got the amp head used and I was testing it out. I turned up the bass knob past 7 and suddenly the amp volume diminished and the sound became really flubby I guess? Very bad sounding and unintelligible at least. I tried it on different wattage settings and with another cab with a different impedance and always got the same result. Any suggestions as to what might be wrong? Could the potentiometer be at fault?
My money would be on a faulty pot.