Ferrari Mailing List: Re: Need help with stereo in Ferrari

[Robert W. Garven Jr. (rgarven]

I am using line level inputs (RCA), and the unit is here:

http://www.crutchfield.com/p_023THB200A/Blaupunkt-THb-200A.html?tp=114&tab=detailed_info

I am getting noise with only the power lead attached, and allot more  
with the RCA cables attached. I am thinking of moving the power cable  
as I read that
if the RCA and power cables are near each other this could cause the  
noise.  With the engine off it works great. I was in a band so even  
though I dont have
any technical training I am used to being around audio equipment. This  
is just a small 8" aluminum woofer that really sounds great until you  
start the car.

 I have the ground on a short lead attached to the bottom of the seat  
rail.  What is a ground loop isolator and where can I get one? The  
stereo is grounded on a small ground near the relay box,
I could ground it there but I thought the closer to the amp the better  
the ground.  Once again I am out of my depths, the crackling through  
the speakers was definitely ignition as you could hear the points
this was with the stereo off. The sound I am getting now is just  
through the woofer which has a small amp inside. The amp has a low  
freq. crossover but this is not like sub-harmonic woofer excursions but
more like something leaking into the amp causing a weird low freq  
crackling


Robert W. Garven Jr.
rgarven [at] gmail.com


 "The Ferrari is a dream - people dream of owning this special  
vehicle and for most people it will remain a dream apart from for  
those lucky few". Enzo Ferrari






On Mar 7, 2009, at 7:15 PM, Paul Bennett wrote:

> > I bought a blaupunk small subwoofer to try to make the samll speakers
> > in my gt4 sound better, I am having a problem and know that there are
> > a few electronic experts here!
>
> Firstly, I would hope you are really talking woofer speakers, not  
> subwoofers
> which are for use below 60hz which is not recorded on tapes.  The  
> use of
> 'subwoofer' instead of 'woofer' usually means low quality.  There is  
> no
> such thing as a small subwoofer.
>
> Where are these components located?
> Ignition noise enters very low level (microvolt) signal paths like  
> radio tuners,
> and tape preamplifiers, not 1 volt level items like amplifiers.
> Under what circumstances are you hearing ignition noise?