Hi guys, I've been driving a lot more now and I was looking to get some better sounds since my current set up is factory. I'm hoping to spend around $600 NZD (~$400 USD) on it all. Here's what I've been looking at so far Amplifier http://www.parallelimported.co.nz/jvc-ks-ax4550-4-channel-power-amplifier.html#first Speakers http://www.onlinecaraudio.co.nz/?p=productsMore&iProduct=1199&sName=fusion-en-cm650 and http://www.parallelimported.co.nz/alpine-sps-600-speakers.html or http://www.parallelimported.co.nz/car-audio/car-speakers/alpine-sps-400-speakers.html Head Deck Unit http://www.parallelimported.co.nz/car-audio/head-decks/sony-xplod/sony-cdxgt-480u-head-deck.html or http://www.parallelimported.co.nz/car-audio/head-decks/jvc/jvc-kdr-312-head-deck.html#first or http://www.parallelimported.co.nz/car-audio/head-decks/panasonic/panasonic-cq-c5305w-head-deck.html Please note all those prices are NZD so they will look a bit higher then what you're used to if you're from USA. If I did get this stuff, would it all work with each other? My car is a Mitsubishi RVR, and I'm not exactly sure of the speaker sizes, any one know? I measured about 15.5cm for the rear, haven't checked the front speakers because I wanted to see if anyone knew before I removed the panels. Can a 4 channel amp power 6 speakers total? 4x6" and 2 tweeters? Any help would be greatly appreciated. Cheers.