Stereo Wiring
 

I recently bought 2 pair of Wet Sounds SW-650's. I am putting them on a Polk PA500.4 amp which says it's rated at 90wx4 in 4ohms. The specs on the SW-650's say the speakers are rated for 100w continuous. Will this amp be able to power these speaker with out causing any harm to the speakers? Thanks!

Yep

Yep
Will be just right

In a perfect world you will have an amp that is alittle overpowered for your speakers. If you have your amp already it will do fine tho. I like to overpower the amp and not turn it up all the way. That way you can get 100% speaker power with zero amp distortion. So if you dont want to blow your speakers make sure you don't turn it up so far that your speakers distort.