soundcraftsmen 900x2 lack of clarity?

through no fault of my own i ended up with a set of magnepan 3.3s. first amp i used was a crown dc300a series 2. too bright. switched to a sound craftsmen 5002. nice sound but perhaps a bit soft in the bass and the 3.3s are very power-hungry. came across a 900x2. have always wanted to try the big mosfet soundcraftsmen. purchased, checked, and hooked up. very disappointed. lacks sharpness and clarity (hope that is not redundant) my darling bride's comment was that there was just not as much music there as there was with the 5002. the 900x2 has had a hard life as evidenced by the dings and scratches and its prior history is unknown. any suggestions on solutions? as well rated as the mosfet sound craftsmen were, i find it hard to believe that there isn't something wrong with the amp