hiddenfortress

hey all, when i have the speakers hooked up i'm getting massive distortion, crackles pops etc. when i only have two speakers hooked (either unplugging two speakers from the sub or unplugging one output from my card) up they work fine: clear as a bell. i've swapped the speakers and cables around but i only get distortion when all four are hooked up. also the also i do not get distortion through the headphone jack. please, please, please, anything but RMA