My 325 came with the "sound system," whatever that was marketed as. Basically it means there's a Blaupunkt-manufactured amp in the trunk, and the head unit sends speaker-level signals to it. The speaker leads all appear in the trunk.
I don't know what happens to the speaker leads that appear near the head unit; there are + and - sides to each speaker, but apparently only the + sides make it to the amp unit. There's got to be another harness somewhere that routes things.
Anyway, I made an attempt to manufacture my own "amp bypass" plug using pieces of wire in the holes in the amp connector. No go. I was missing a wire for the "common speaker -" connection (which I later found, I think.)
So.. off to the local electronics retailer for an amp. I picked up a Sony 4x150W (peak) amp for a good price, and got some 12' RCA cables.
Routed the RCAs from the trunk to the head unit, removed the Blaupunkt OEM amp, and bolted in the Sony. A few wiring connections later, and we're in business. GREAT sound from small speakers. The job probably took 2 1/2 hours all told.
I found out the rear speakers are aftermarket Alpine's, and the front ones in the kick panels are original =( Better yet, they're a strange, and small, size. So I'm looking at doing some modifications if I want to put in 5 1/4's or 6 1/2's.
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