If you need REAL grunt, Id look at the 15.0, which has absolutely incredible power reserves. The S12.5, which I have, is a little powerhouse itself. I had Coda up the Class A bias to 25-30 watts. For MONSTER output, look at their monoblocks, which put out in excess of 400 watts. In Coda amps, the transition from Class A to AB is undetectableat least to my ears.