Okay, did anyone have any problems with alternator noise when using a aftermarket 4 channel amp and the factory radio? I learned that you can't really use the line out converter at the bose amp because every channel is crossed over. To add to the mess your signal coming out of the head unit is a common ground and already a low voltage input meaning you don't need a line out converter. So I spliced some nice rca's straight into the front channels using the same ground for the left and right channels, but i'm getting alternator noise and it's killing me. My 4 channel is only running the doors. I left the bose amp to run the tweeters in the A pillars, the center speakers below the center console and the rear speakers in the back pillars. There's no way a 4-channel amp is going to run all those channels. Don't get me wrong it sounds great and is loud as hell, except for the noise. I did add a Kicker KQ9 EQ to add the ability to change the sound beyond the stock head unit. I ran zero gauge to under the second row seats and split it off to 4 gauge to both of my amps. I'm running an Alpine 1000 watt RMS and Hifonics 800 watt 4 channel amp. I disconnected the factory sub and have a pioneer premier sub in a Bass Pro Box. The sub can handle 3500watts max and hits lows like you won't believe (12 inch). I just can't get rid of this damn noise. I also isolated the remote from the remote coming out of the head unit using a relay switch, grounded the EQ to the chassis, grounded the negative battery terminal to the frame using 0 gauge. I'm not sure what else I can do. I don't want to use a noise filter. That takes away from your sound quality.