Ken, no problem thanks a lot for the clarification. I have read many of your posts on this board and have learnt a lot from them. I do not know many professionals who take the time to provide that much information in forums like you do. Anyway, the reason to keep the DSP amp would be to keep the DSP (Digital Sound Processing) capability which I actually find pretty cool. Let me explain where I was coming from with my question which may sounds stupid for a car audio expert. Knowing that the rear speakers really suck I was thinking about why not adding an amp after the DSP just to improve the rear sound and replace the rear speakers by the same token.