Just a passing thought.. I was given an amplified bass tube (300 watts 10" sub dual voice coil). It came with about a 15 ft rca cable and a line leveler adapter which I used due to the rca plug conversion (tapped into the input side of the amp). I initially had the leveler dialed up full, due to the fact head unit output isn't exactly a "high level". I ended up with a buzzing from the stock speakers untill I dialed down the leveler. Anyone else ran across this scenario?