Stereo

[Kissner]

I've got a 98 M3 that didn't come with a CD player in the trunk or dash. It's prewired for a 6 disc in the trunk. I've got a 12" Alpine R Type sub and i'm ordering an amp. The local shops(in the boonies) say that it isn't possible to hook up a sub with the factory speakers and have them all work. Also they say I can't put a head unit in and get the factory speakers to work. I don't think this is true because of all the people on here with stereo's in their BMW's. Can anyone give me directions on how to wire it so it works? I also was wondering if my factory tweeters and mid range speakers are strong enough to run with my sub or should I replace them? Thanks

[El Presidente]

Yes, replace the speakers. You can drop money in for a new HU, but it will sound almost identical unless you put some better speakers in. Even if you don't replace the HU, you can still hear a difference with better speakers.

As for wiring it, yes you can. To run it off the stock HU you need a line level adapter. Splice the leads into two sets of speaker wires and plug your RCAs into the box. Done.

You can also put in a new HU and it might work. If it doesn't you would need to bypass the amp.