i have the w4s st 1000 amp since 2012 same amp only in one chassis it powers magnepan 20.7 's just beautifully I have no desire to change I get off on the music every session powerful ( 565 / 1130 @ 4ohm ) smooth detailed sound fills a 27' by 20' room effortlessly best $2,000. I ever spent obsolete I don't think so enjoy
