Quote:
Originally Posted by MattHoffman
There are still wired to the oem head unit.Just wondering of there is something inline on the speaker wire filtering out the bass
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The factory head unit is really a 4 channel device even though it is supplying 6 speakers. The front channels are full range. These supply the mids in the dash, the tweeters and the amp that feeds the front door speakers. The rear channel goes to the back speakers only and has a factory crossover installed. The crossover is in the head unit itself and as of yet, no one I know has any way to defeat it. If you want good speakers or a sub in the back, you will have to feed them a signal from the front channels on the head unit or else you will have limited bass.
It's not the prettiest solution but I would rewire the door speakers to be powered off the rear channel of the head unit. This will limit bass to the door speakers which may not be a bad thing since some people have complained about their doors rattling. Then I would wire the rear speakers up to the front channel where the door speakers were.
Doing it this way you would supply full range to the 4 dash speakers and the rear speakers. The rear channels would power the door and limit the bass to them. Your fader wouldn't fade from front to rear anymore but you could still balance the system by attenuating the amp to the rear until the speakers blend.
Page 322 has a wiring diagram for the front channels and page 320 shows how the rear speakers are wired:
http://www.ft86club.com/files/BRZwiringi.pdf