Ive got a total of 4 4480.1s and all of them get down pretty dammned good.No problems out of mine.Ill be placing one on ea. XFL 12 in a wall being built as we speak.They need the proper power to shell out some juice. Dont expect to just throw one on stock electrical with a stock battery and nt doing the big 3 and expect miracles.Mine slamm like Donkey Christmas Kong.I wouldnt be placing or using if they werent doing what I want.Great amps in my opinion and experiencing. Ive also experienced with the 26801,and the 150.4, and all have been great amps,with no issues.