I now have a pair of Magico S7 speakers (Impedance: 4 Ohms, Sensitivity: 89 dB). I am driving them with a pair of c-j Premier 12 mono amps (140 W for 4 ohm speakers). The sound good with these all tube amps, but I know they can sound better with more power (the dealer played them for me with some 400W solid state amps that certainly made the bass sound better). I would like some recommendations on high power amps and any input you have on your personal use of high power amps. Thanks.