Tom,
I too have ADS, separarte tweeters and a center speaker pair. In my case it is the center channel on the surround sound. The input to my speakers ( and for now until I check more ) I assume for the center one too is swithced with relays behind the trim panel at ceiling level on the driver's side. The relays have 115vac coils and are energized when the receiver is on. In that situation, the speakers are switched to the receiver. When the receiver is off, the relays de-energize and switch the speakers to the dash stero system. It may well be that in the dash mode the center speaker is not powered, but a sleeping daughter keeps me from checking that right now :-)
Russ
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