Amp/Int. Amp to smooth the highs...

...okay, so here is the story...i just purchased a pair of great sounding speakers...i placed them in my rig and they do everything amazingly well, but the top tend to be a little bit screechy (i can live with it, but maybe can be fixed) from time to tome...well, my preamp/amp are not screechy as they proved with the old speakers...so, me thinks i might need another amp or int. amp to replace the amp and the preamp to "mellow"a little bit hte highs but still with great bass, soundstage, midrange, etc...is anything out there?...my current system Audiomeca Keops, Innersound preamp, Innersound ESL amp, and Innersound Isis just replaced by Usher 719xspeakers...

thanx