Somebody please help.. I just got an amp and 2 speakers for my PC.. sure beats the small little cones.. anyway I experienced a lost in highs connecting from my com -> mixer -> amp... without EQ.. but I listened using mixer's phones the sound was ok... but when I use my earphones to listen from the amp headphone out.. the sound was like the speakers.. boomy and no highs.. The hi-hat and cymbals all sunk into the back. But when I connect direct from com -> amp the sound was ok. Im using a Mackie DFX-12 and I suspect that the problem lies between the mixer and amp. Can lousy RCA's suck out the highs from the sound? Or is it my mixer just can't go well with my amp. My amp's a 300 watt music amp with 3 channel speakers.