Update · May 14, 2007 by Matt Gilbert
Here's an update with just a few details.
First off, the toggle switch you'll need is a "4PDT" switch, or anything with the same spec with a number greater than 4.
The impedence concerns of one poster seem to be nothing to worry about, according to everyone I've talked to who has anything to say about it. The seperate CD player seems to pass a signal at line level, and that seems to be what the head unit expects. However, I'm not sure if I made this clear before, but this is a first time thing for me, so do it at your own risk.
If you're looking to do this on a system with a different set-up, this hackaday post
will help you sort out a strategy.
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