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

[Red5hilser (Red5hilser]

I guess it all depends on what you bought your Fazazz for. Some like the  
opulence of the fine leather interior, the look of success, and the quiet ride  
while being able to enjoy the performance of a state-of-the-art stereo  system.
 
Me? Not on your life. With the four 2-throat Webers sucking air and gas  
louder than Monica in the Oval Office, and the Euro headers to pipe, to  
tin-can 
exhaust, I couldn't hear good stereo if I even wanted to. (which I  don't!) 
That's not why I drive a Euro Ferrari. No cats, no smog pump, no  nada.
 
One of the big disappointments of my life was sitting in an America  spec 348 
GTS in Tucson and revving it up only to hear what sounded, to  me, like a 
Singer Sewing Machine at half treadle in the old L.A. garment  district back in 
the day.
 
Sorry, but that's the way I feel.  --  Yer pal, Ferrari  Bubba
 
 
In a message dated 3/8/2009 12:06:19 P.M. Central Daylight Time,  
dnt [at] dock.net writes:

I  recently attended a diagnostics OBD II class covering the new onboard  
communications protocol called CAN (Controller Area Network). For 2008,  CAN 
is used on all U.S. passenger cars and light truck.

Found a  break in a wire?  Want to repair it?  This touchy system requires an 
 
exact number of twists per inch, same length and gauge wires and don't  even 
think about splicing unless you hold an ME in advanced auto  electronics.

My head hurt after that séance.  heh  heh
DOUG
(does electricity flow over or through a  conductor?)

----- Original Message ----- 
From: "Charles Perry"  <charles [at] carolina-sound.com>
To: "DOUG" <dnt [at] dock.net>
Cc:  "The FerrariList" <ferrari [at] ferrarilist.com>
Sent: Sunday, March 08,  2009 8:42 AM
Subject: Re: [Ferrari] Need help with stereo in  Ferrari


> Just for everyone's future reference, the basic  problem with all car
> audio systems with respect to noise is that car  audio is unbalanced by
> design (meaning the music's electrical return  path and ground are the
> same conductor). A properly balanced system  (most pro-audio equipment)
> uses three conductors (positive, negative,  ground), rather than an RCA
> line's two conductors (positive,  negative/ground).
>
> The signifigance is that the "shield" of RCA  wires is not actually a
> shield since it is carrying the music signal.  That is also why it is so
> prone to picking up noise. This is why  things like Monster Cable
> interconnects are complete wastes of money.  Extra layers of shielding
> are, by definition, not shielding in car  audio, nor in the vast majority
> of home audio (anything with RCA  connectors).
>
> This is also the hint of truth in Jeff's  suggestion for using network
> cable. Network cables are balanced and  use their twist as part of a
> noise rejection scheme (same as balanced  pro-audio cables). This works
> in networks due to the balanced  electronics on both ends. Using network
> cable for car audio will not  give you the same benefits because the
> electronics at both ends are  unbalanced. It will still work, but no
> better or worse than regular  RCA cables.
>
> In the 90's Rockford Fosgate tried to introduce  balanced audio into the
> car stereo world in their upper-end lines but  it was expensive and
> poorly understood and did not catch  on.
>
> My current favorite scheme is using fiber-optics as  interconnects, but
> this requires equipment that is designed for that,  which is expensive.
>
> -- charles
>
>
>
>  -----Original Message-----
> From: Jeff Greenfield  [mailto:coyote [at] acme-ltd.com]
> Sent: Saturday, March 07, 2009 10:24  PM
> To: Charles Perry
> Cc: 'The FerrariList'
> Subject:  Re: [Ferrari] Need help with stereo in Ferrari
>
> Three things  come to mind.
>
> One is that you are picking up RF noise from  through your RCA cables.
> Believe it or not, I have read that the best  thing to use for to connect
> components in a car is CAT 5 Network  Cable. I've used this (making my
> own
> cables) on the last few  installs I've done and have had no interference
> problems at all.  Sometimes the shielding in shielded cables will
> actually pick up  noise.
>
> The other possibility is that you are having a ground  loop problem. This
> occurs due to a very small difference in potential  (essentially voltage)
> when components are grounded at different points  on a cars chassis. You
> can try a ground loop isolator to see if it  reduces or eliminates the
> noise.
>
> One last thought, if  your sub uses speaker level inputs from your head
> unit, sometimes this  causes random popping usually when switched on and
> off. If there is  any way you can use line level inputs to the sub (I
> assume you are  using a sub that has its own amp) you would be much
> better  off.
>
> Jeff
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