thanx guys,

but perhaps I didn't describe my problem exactly.

I complain about sound character of these amplifiers, that means, when I listen in very close area to speakers, I hear the bass drums are not that bright, dynamic, blowy and with the specific contour.
I guess, some mids are pushed and might be some different cables can help.
(As I mention also highs are not that great)

So. I don't mind about some boomy bass in my room, I know that's matter of acoustic.