First the new White Oak driver board, DC protect relays wit on/off muting, bigger PS caps, new RCA jacks, new speaker posts, new On-Semi MJ 15024's as drivers pushing On- Semi MJ 21194's for outputs.A 500WPC per channel, bullet proof, ear drum shattering, neighbor pissin off beast when it's done, oh and all this with THD & N in the .008 % range.