My setup consists of a MIA Fender Jazz with Dimarzio Ultra Jazz pups (not an active bass), an Alembic F1-X, a Stewart World 2.1, and an Acme Low B-2. My problem is that whenever I turn the Alembic up past 4, I get distortion and I'm not clipping. I'm only pushing 650 watts into a 4 ohm Acme. I tried plugging my bass into the -6dB input on the Alembic and still the same thing. I tried turning down the power amp and it only made the distortion worse. Is the Alembic a bad match for the Stewart or is the problem somewhere else? Please help.