Re: old car new stereo


"Matt Ion" <soundy@xxxxxxxxxxxxxxx> wrote in message
news:Cnnxf.195500$2k.44673@xxxxxxxxxxx
> MOSFET wrote:
>> I'm a little confused when you say "one wire per speaker". All speakers
>> have both a positive and negative terminal (electrons must flow from one
>> to the other). I don't believe it's possible to use a car's ground as
>> the negative connection because this would mean DC powered speakers,
>> impossible because AC is required for the back and forth action of a
>> voice coil. Double check the speakers to be sure there aren't TWO
>> terminals, there should be.
>>
>> MOSFET
>> "lerningdisorder" <lerningdisorder@xxxxxxxxx> wrote in message
>> news:1137039825.254025.220980@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>>
>>>i in installed a new car stereo into my 1985 chevy truck. there are two
>>>wires for each speaker from the stereo but only one wire per speaker.
>>>how should i wire them together?
>
> A lot of old decks used a common audio/power ground. Most decks that
> don't have a switching power supply for the amp are common ground, I think
> you'll find, and you CAN use the body for the audio ground.

That's interesting, and forgive my lack of EE knowledge, but isn't it true
that by necessity a speaker voice coil needs AC to create the back and forth
induction effect. How can AC be created using a car's ground as one of the
poles? By definition, a car's ground will ALWAYS be negative. Is it that
the speaker simply works on DC?

MOSFET


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