Well, I have a CD/MP3 player, and I love it. It works great. 52x4 I believe. I am currently running 5 1/4" Sony Xplod 3 ways in the bottom of the door, and Infinity (old ones, not sure of model) 6"x9" in the rear panels where the original 4"x10" went. Also running ~200 watt Sony amp powering 2 8" Pyramid subs that sit next to the armrests of the rear seat. I would like to get new speakers, and maybe put another set in another location. I had my best friend show me some stuff, but I realized he talks a lot, but doesnt know technical stuff, other than "this is a good brand." I need new sub speakers and amp. Amp probably got a little wet (the bottom was rusty), and it started to cut in and out. Im not looking for bling bling sound, but I do want a nice sound for the price. I do drive this everyday, and I enjoy road trips. For some reason, I just couldnt get the volume without distortion. Even with all the windows open, you couldnt really hear much from 20 ft away. I need some upgrades... Im looking for a range of around $500, could go up to $1000 if really needed. What should I do???