I am looking at the Pioneer DEH-P77DH. It has F&R preouts and also a sub preout. It is 45x4. I am going to get four infinity 63.5i 6.5" 3-ways and an MTX 10" sub. Do I need an amp for the 6 1/2's??? Is there any way that I can get one amp for the whole application? All help is greatly appreciated. Thanks,

Brian

 

Your HU's amp section isn't all that great. You'll get better performance from your speakers using an outboard amp. To help keep the install simple you could use a 5 channel amp. One with 4 channels for your speakers and a class D channel for your subwoofer.

 

What is an HU?

Brian

 

Head Unit

 

I picked up a Phoenix Gold XS6600 on ebay and put in my car.
It is a 6 channel amp and will deliver more than enough performance for what you want. I believe it is 50x4 and 150x2 or 300x1 bridged.