<VV> really simple dumb question: coil radio noise suppressor

[Bill Elliott]

Yes, Radio Shack is a good source for the noise chokes. I like to put one on 
every audio power wire...

But I think you have a more basic issue with design. It sounds like you are 
running unshielded wire from the radio back to the amp... then amping 
everything you pick up with that wire. As you note, that can be quite the 
signal even with the radio off.... then you're amping that low level 
interference up along with your radio signal and turning it into real sound!

Either move your amp up front near the radio or figure out how to run a 
shielded signal back to the amp... I think that will cure 90%+ of your 
problems.

Modern electronics doesn't like using the car body as the negative speaker 
ground either...another way to pick up a lot of noise...  run shielded 
positive and negative to the amp then separate positive and negative to each 
speaker without grounding anything expect the head unit and amp to the car 
itself.

Bill


----- Original Message ----- 
From: "Ray Rodriguez III" <ravensong13 at verizon.net>
To: <virtualvairs at corvair.org>
Cc: "Bill Elliott" <corvair at fnader.com>
Sent: Wednesday, December 23, 2009 10:53
Subject: Re: <VV> really simple dumb question: coil radio noise suppressor


> Thanks Bill, can you tell me more about this modern noise choke?  Where do
> you install it and where do I get one (radio shack?)
>
> Here is what Ive got....
>
> Original factory FM radio
> Signal goes out from this to the rear package tray where I run it through 
> a
> cheap crossover, through a radio shack ground loop radio noise eliminator
> (that knocked it down to 50% of what it was), to a cheap amplifier.
> From that amp the speaker wires go to the four speakers in the rear 
> package
> tray and to the one speaker in the factory dash location.
>
> I am using Seth's plug wires
>
> Input to the factory radio is the factory FM antenna and a sattelite radio
> unit with an FM direct adapter.. this automatically disonnects the antenna
> and pipes the signal for the sattelite radio directly into the antenna 
> input
> on the factory radio.
>
> I get noise in the speakers as long as the amp is on, even if the radio is
> not on.
>
> The other really odd thing is apparently I only need a single lead for a
> radio signal...  when I disconnect the "negative" speaker wire from the
> crossover input the music still plays just the same.  I noticed the old
> speaker someone had installed in the rear tray had only one wire to the
> radio and the other was connected to ground....
>
> Ray Rodriguez III
> Lake Ariel, PA
> CORSA member
> 66' Corsa 140/4 hot rodded coupe
> 65' Corsa 140/4 coupe under construction
>
>