Title kind of explains it. When I bought the truck I had an aftermarket head unit, panasonic something (it folds down and stuff) and some infinity reference speakers. It all sounds okay, but it's very empty sounding because there is almost no bass and it gets distorted very easily. It looks like it had an amp, but they took it out before they sold the truck. It's got all of the wiring, including a red and white( maybe its black?) ended cable hanging out under the dash which also has two ends in the back, along with a large wire (for power i'm assuming) in the back under the carpet. I hate electrical stuff of any kind although I did help my friend put 4 new speakers+headunit+amp in his 94 pickup. Does it sound like this is just sub wiring or if i bought a 4-channel amp would it in anyway help out the other 4 speakers?