wow, it's hard to imagine that system is bright... could the monster power unit be restricting your low end or something?
if it were me, i'd try plugging stuff into the wall for a bit just to make sure it isn't doing something to your sound. on paper, your system would seem to be a very nice, warm system.
that being said, the least bright cables i've heard are van den hul carbons (the first and second model lines of interconnects). samhar's suggestion of anticables is good too (i have the speaker cables myself and to me they do sound better than many vastly more expensive cables), but they aren't the easiest to use as they are thick, solid-core wire.
if it were me, i'd try plugging stuff into the wall for a bit just to make sure it isn't doing something to your sound. on paper, your system would seem to be a very nice, warm system.
that being said, the least bright cables i've heard are van den hul carbons (the first and second model lines of interconnects). samhar's suggestion of anticables is good too (i have the speaker cables myself and to me they do sound better than many vastly more expensive cables), but they aren't the easiest to use as they are thick, solid-core wire.