[geeks] Stupid Electronics Help...

[rjtoegel]

Also, you can drive five speakers from a stereo amp. The front and back can be
fed by each channel by using a fader control and the center front is just
between the hot leads from each channel.  That gives a difference between the
right and left channels.  Only problem is that in today's cars, the speaker
grounds may not be grounded.    Sometimes messing with the speaker wires will
make the car computer throw out weird errors since the audio may be tied in
with the computer.  If there are three wires from each speaker, don't mess
with it!  Trouble will ensue.

Bob

Sent from my iPod

On Dec 30, 2012, at 9:13 PM, Jonathan Katz <jon at jonworld.com> wrote:

> Thanks, everyone!
>
> I found a DPDT at Radio Shack which seems to have solved my "crisis" 
other
> than the fact I mis-read the label and wired it up wrong. I gave up for
> tonight and will resume my shenanigans once it gets a tad warmer out.
>
> The whole goal is to add an AUX in to my wife's Volvo. Her Volvo has a
fancy
> sound system that uses the MOST fiber-optic stuff, so you can't just patch
> something in like with typical systems. Using one of the radio/FM
> mini-broadcasters is a PITA and the quality is horrid since the car has an
> antenna that is integral with the tailgate(!)
>
> Going through my pile of parts I had a spare car audio amplifier. I bought
it
> years ago at the firesale at Circuit City when they were going bankrupt.
>
> I put together an aux-in 3.5mm port on the dash and ran wires to where the
> MOST amp is under the passenger seat. I also ran a 12V switch on the dash
and
> wired the hot 12V wire to under the seat.
>
> The goal was to have the relay turn off the MOST amp (which is why when the
> relay is deactivated that pole should remain closed so operation is normal)
> and power on my amp. Then my amp would pump sound to the existing speakers,
> splicing into the existing wires to existing speakers. Because my spare amp
is
> only two channel and I'm powering five channels (LR, RR, LF, RF, and Center
> Front) I was planning on using diodes in-line on each channel so that with
the
> new amp hooked up I don't wind up bridging my entire set of speakers.
>
> My diode idea should work, right?
>
> On Dec 30, 2012, at 6:54 PM, rjtoegel <rjtoegel at gmail.com> wrote:
>
>> That's what I said. It's probably easier to find a dual throw than just a
>> plain NC. Even Rat Shack carries them.
>>
>> Bob
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