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Sorry, been away fro a while.
Looked at your handy-man link and z_lust is absolutely correct. Your car has balanced audio. Theoretically you can connect - (or +) to ground and have a standard system (the other way cannot be done) but its possible that Bose has poor design and that this is not possible.
I have a cheaper solution and that is to decouple the audio with capacitors. You might need a trafo later to get the quality you need, but it is a simple test to find out if this is the root of your gain problem. Just put a capacitor inbetween the (-) input and ground (common) output from your sound card. 10uF el.lyt. Oh, you need two caps. Do not connect the two (-) together.
One more thing, you _can_ get amplification in passive trafos...
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