I want to get an amp to run my door and sail panel speakers. They are pioneer, i believe the rear are 6.5" 90w and the door are 5" not sure watt. 1st question is what size should i get. 2nd question is I have not wired an amp to these speakers before so how should i do it, unplug wires from hu to speakers and run wires from speakers to amp?

 

Are all the speakers aftermarket 4 Ohm? The door is.....5"? Is that part of a component setup or something? RMS ratings are useful in determining how much power you want your amp to have... Your best (and easiest) option is a 4ch amp thats stable @4 Ohms with the power you want.....you could also get a 2 ch amp though as long as it's stable @ 2 Ohms and you wire the 4 Ohm speakers in parallel (likely cheaper..but some drawbacks). All of this is assuming you have 4 Ohm aftermarket speakers only.