Cats and Audi's frightening electrical design

[Ti Kan]

Ti Kan writes:
> The nav system sends a signal to the radio to mute when the nav voice command
> comes on.  However it doesn't actually send the voice through the radio.
> On Bose systems there is a separate speaker on the driver's door for the
> nav/phone output.  On non-Bose, the stereo speaker on the driver's
> door is a dual voice coil unit, one fed by the radio and the other by
> the nav/phone system.

I did a bit of looking at an A4/S4 Bentley CD manual, and found that
my description above is not accurate.  This is how things work on
cars with the Concert and Symphony radios:

On these cars, the telephone and navigation systems provide mute
signals to the radio, as well as audio (voice) signals to the radio.

On non-Bose systems, when the phone system is in use or if the nav
system produces voice commands, the radio is muted and the nav/phone
voice comes through the regular front door stereo speakers.

On non-Bose systems, when the phone system is in use or if the nav
system produces voice commands, the radio is muted but the nav/phone
voice comes through a special, separate speaker on the driver's door
for this purpose.

My description about a dual voice coil speaker applies to earlier
models, not those that use the Concert or Symphony radios.

Sorry about the confusion.

-Ti
01 S4 2.7 biturbo quattro
84 5000S 2.1 turbo
80 4000 2.0
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    ///  Ti Kan                Vorsprung durch Technik
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