Re: A4 antenna amp?

[dan_masi@MENTORG.COM (Dan Masi)]

On Nov 5,  4:02am, Jay@aol.com wrote:
> Subject: Re: A4 antenna amp?
> In a message dated 96-11-04 12:09:38 EST, dan_masi@MENTORG.COM (Dan
Masi)
> writes:
>
> > Hmmm.  I wonder if the antenna amp is co-located with the rear
> >  speaker amp?
> >
>
> Bing bing bing!!  Ten points.

How many points do I need for a free supercharger upgrade?  :-)

> I stuck my handy Levitron "BLEE-bloo-BLEE-bloo" signal tracer

What is it?  How do it work?

>  There is a red-with-blue-stripe wire running from the radio
> harness to the speaker/amp assembly, labeled "U(B) +12" on the
> radio.  Interestingly, if I give this 12 volts unswitched with
> the car off and the door open, the door-is-open bell starts
> ringing, as if there were a key sensed.
>
> Anybody remember what the red w/blue stripe wire is supposed to
> be hooked to?

I think you've already answered the question.  Remember that the
Audi head unit has an interesting way of deciding when to turn
on and off.  Stays on when you turn the engine off.  Shuts off
when you pull the key.  Turns back on after you put the key in
and start the car.  This wire must be the key-in-ignition signal,
then, and by hooking it directly to +12, you're overriding the
ignition switch and telling the rest of the car that there's
a key in there.  Sounds like you can safely ignore this wire.

> Also, do I have to worry about "competing" amps on the rear
> speakers - I'll have the factory amp with no inputs, and my
> regular amp, both connected to the speakers?

Ummm... you don't wanna do that.

> I can't see a way to disconnect the factory amp, since I
> believe it's impossible to disassemble the speaker/amp module.

But how are you connecting to the rear speakers then?  I would
think that if you've got things apart enough to get at the
rear speaker inputs (factory amp outputs), that you can do
the disconnecting there.  No?

Dan Masi
'96 A4Q