fly, if your gonna run just 2 kappas, put them in the front and references in the back. how much power do u want? the kappas can handle 100watts rms(constant). not sure about the references, i believe they handle less or have less sensitivity. u can look at the jbl 80.4 which puts out 40watts per channel. i got mine for like 130-140 shipped new off ebay. u should be able to find lots of 4 channel amps with good output. if you dont care about looks, then your selection is unlimited. there r tons.
