Thanks for the reply guys. Will use the HU xover, kinda figure **** out yesterday while doin a lil tuning. Well M5 its a cs3 lancer (2004 model). And what do u mean by a fresh ground for the HU, just used the normal ground from the deck. Will also fiddle around with the options u gave me to see if it solves the problem. Flakko, i am leaving the grounding of the rca to HU as my last option. If doing this do i need to ground all three rca output or just one. By the way on a manual for the AX amps which i found on the net, states, The input of a us amp must be grounded for proper operation. Does this means that i must ground my rca to hu, rite.