I know this has been covered 1,000,000 times, but has anyone been able to come up with a simple reason to why it happens? or how to fix it, besides replace everything. i've been through the archives every which way and all i can find is a ton of people claiming they have the same problem.  for those who have no idea what im taking about...it seems that almost everytime someone bypasses their factory amp to put in an aftermarket HU the driverside door speaker puts out 0-10% of what it's capable of.