I have two Fi q's dual one ohm wired at 1 ohm, and one T20001bd. The amp at hi volumes goes into protect mode at hard bass notes. It doesn't stay in protect mode it just does it for a second, but throughout the whole song. I can strap the subs at 4 ohms but I'll be under powering the subs big time. Its annoying and I would really like to know if theirs a fix for it.