B&W matrix 801 s2 with Electrocompaniet ECI 4 amp?

Too little.You need at least 200 - 300 watts of good SS to make them sing. Mosly due to impedance issues. Jim

I agree with Jim94025. I have a pair of B&W 801s SII and I was using a Nakamichi PA 7 with 200 watts per channel, but upgraded to a Mark levinson 336 at 350 watts per channel at 8 ohms. At lower impedence the amp just keeps providng power with no strain . The B&Ws need lots of clean power and are very revealing, so you must consider all componnets including cabels to really make these speakers sing.