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Posted by Devin [Email] (#2469) [Profile/Gallery] (more from Devin) on Mon, 12 Mar 2012 19:15:22 Share Post by Email
In Reply to: Re: RCA line-ins AREN'T speaker cables. Rewire from head., TomR 97CSE, Sun, 11 Mar 2012 18:15:31
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Tom,

Sorry for the cryptic message. I had the same problem with my 900 some years back. But I might not be remembering correctly how I fixed it. Or I might be mixing up my cars.

RCAs or whatever non-RCA-type cable Saab uses carries a line level signal. If I recall, it looks like some proprietary Monster Cable stuff. Not speaker wire and not RCAs.

The signal doesn't have enough . . . gain I think . . . to drive the speakers. I might be mixing up my terms because I'm an English Professor, not an electronics guy. But trust me. The problem is not just the cable coming into the amp from the head unit, but the signal coming from the factory unit. If it's intended for an amp, it won't drive a speaker.

So your problem might be that because the original head unit was designed to send a signal to an amp, not to speakers, the adapter you have isn't getting the signal it needs to get from the new head unit (because it's based on the old head unit's specs).

This was the problem I had in my 2nd 900 now that I think about it.

What you need to do is use the adapter for 90% of the connection. And then splice new speaker wire directly into the new head unit's speaker level outputs for the rear speakers. Run these back and you'll be fine.

I doubt the adapter is smart enough to send speaker level output to the cable headed toward the amp. And even if it was, there wouldn't be enough gain.

In theory, you could try to splice into the proprietary wire headed to the backseat, and jump the amp, and then run new wire to the speakers, but it might be coax or something. And it would be more trouble than it's worth. A +and a - aren't always = to a + and a -.

Hope this helps.

posted by 24.90.19...
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