alright im new to the whole car system thing, but i finally got some cash saved up and want to get a system. i am planning on getting 2 jl w6v2 which are 400rm 6 ohm? i am really confused on what kind of amp to get. 2 channel? 4 channel? whats does 600W RMS (continuous) x 1 @ 4 ohms, bridged mean? thanks