Hi, Ive been reading all of the review that I can find on the Matrix M stage, and I an highly considring purchasing one to powe my Grado 325is. I understand there are plenty of reviews on this amp (that I have read) , but nobody from what I have read has posted any comments on this combo. My concern is that I do not want to change the sound signature of my 325's, I would still like them to be fast with a nice tight bass and crystal clear highs. and the awesome attack that I love about them. Does anyone have this combo that can reply to my concerns before I make my purchase? Thank you.