I was using a dl4 and a headrush. but changed to 2 dl4's. it was quieter, and better all around, BUT!!!! noticed a slight distortion on the top end, Gain adjustment on amp won't change much. so 1 dl4 is cool, 2 is too much signal. What's the go? please help. i bought the 2nd DL4 instead of paying my car rego. Have i made a mistake! cam