Well the factory radio is only 5% distortion at max output. If you have a hi/lo convertor that takes the factory wires and converts it to low level, then hooks into the amp, it should sound fine. A buddy of mine just did this with his bose system so he could use his sub and amp with the factory bose speakers and it sounds great. You must have something hooked up wrong. For starters, check the polarity of your connections. Make sure you spliced and tapped the rear wires correctly into the convertor. Then look for a switch on you amp labeled "hi pass" "low pass" and "full" (or something along those lines). Make absolutely sure it'* in the LOW PASS setting. Then check youc gain and frequency setting to make sure they are in adjustment. Then on the other end make sure your sub is connected correctly to your amp. As far as the turn on lead, the car won't have switched power at the fuse box in ACC. Mine doesn't either, it will only be in ON position. That you might just have to live with.
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