Maybe you should consider running all your speakers off the head unit or change that out instead of putting in a new amp. I see you asked the question earlier but didn't get an answer. I don't know about the Clarion, but a modern head typically has a fairly powerful amp and can drive a number of speakers. I checked my Fusion MS-RA770 manual and it has a 280 watt amp and will drive two zones with four speakers per zone for a total of eight. Seems like it might be easier to change out and likely similar cost. Probably not the solution an audiophile would like but if you're not in to high volume and the best sound it might be enough.