First off, thank you for breaking it down for people like me who don't know too much but still would like to have a nice sounding system for a relatively low price. I am looking to replace the HU and door speakers for my 98 Chevy Ext Cab P/U. I have an older amp that I am looking to use, a Kenwood KAC-608S, RMS is 50W I believe. I am looking at a Alpine