I was curious did you measure your ground resistance? It needs to be below 1%. Sometimes on unibody cars it is hard for the amp to get a proper gnd in the trunk or seat area. I've had readings at 60% or higher. Sometimes to sove this you may need to run a gnd from your battery back to your grounding point for your amps...some suggest to use the same size as your power which is fine but in test I find this overkill and costly....you can get the same results with cable as small as 10g...the meter never lies //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif Now this is on basic street beat type of system...I'm not talking about competition systems...Where they run 5 1/0's positive and gnd to save all current....Another thing make sure you upgrade all battery gnds to beefier wire..do the big 3.....//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif