my amp is DIY by me went I was form 3. only 2.0, use stk6153 + stk3048, and I was open the IC and adj some think. and use the 6'' Pioneer long speaker for low speaker, and cut down from the other oil speaker of pioneer(4609) for hight speaker. but, at that time I block down so much stk6153. ......... so far I fill so good!