In Reply to: Tell me you're in Colorado. posted by Mark H on November 28, 1999 at 23:37:24:
There are outputs from the stock head unit that you can use. They feed the signal to the factory amp. They are fairly high voltage though, so whether or not the level needs to be reduced depends on the component these outputs are connected to. For me, it was the Audio Control EQTs. They can handle the high voltage, so I connected it directly. If you use some low-end amp or signal processor, you may need to use the crappy speaker line thing. BUT there is an alternative. If the output of the head unit overdrives the input to the next device, it is better to avoid the crappy speaker line thing and use high quality resitors to drop some of the voltage. If you want more info I can explain how to find the right resistor value.
It would be possible to install 8" subs in the rear deck. However I like to use woofers at least 10" in diameter for reduced distortion and increased low frequency extension. In addition, large holes would need to be cut in the rear deck, making it difficult to restore the car to factory spec. (I suppose the metal removed could be welded back in later, but that's getting a bit hairy!) If this is not a concern, I think a pair of 8" IB woofers (I would recommend JL Audio) would sound pretty good with most music. An EQ would help.
Hope this helps! Sorry I took so long to reply. Drop me an email if you want me to elaborate on the above.
: I would agree that that is one hell of a write up and although this message is going to make me sound like a dumbass, I do know a little about installing audio equiptment.
: I wasn't quite clear on something that you mentioned. If I leave the nav/radio system as is, are there amp outs or do I have to install that crappy speaker line to ampout thing?
: Also, why not just remove the rear speakers and put two 8" subs in there place? Is there enough room under the rear deck to do this? (I am getting my 328ci next week)