ahbongkeo wrote:I had the stock head unit and the front speakers weren't working. i changed the deck and the front speakers still doesnt work. i was told that there is an amp that control the front speakers and that amp maybe mess up. i want to try to bypass the amp and conect the speakers directly but i dont know where the amp is located
Well on my 89 240sx, the front speakers have that cross-over/amp thingy attached to the back of the plastic mounting for the speaker.
You can basically unscrew the plastic mount and rip out that whole electronic crap. Then you just basically find the positive and negative wire by looking at the colors of those wires with the ones near your harness.
Once the amp/cross-over stuff was cut and the wires directly to my speakers, the speakers worked w/ my aftermarket head-unit.