ok i got a 89 se with the bose system, i replaced the hu and now i am replacing the speakers, y do i need to wire around the amps and how come when i do the speakers are so quite that even when turned up as loud as it can be u can barly hear it?

 

You need to by-pass the amps because they aren't compatible with aftermarket equipment.

Also
http://northwestnissans.com/board/sh...ad.php?t=28899