[s-cars] Bose Woes

Tue Dec 23 22:41:49 EST 2003

Scott to the best of my knowledge there are low impedance speakers AKA 1
Ohm.
You would be ill advised to run them on the factory head unit at least IMO.

Now, as to electrical noise...
I have after market equipment, Head unit, Parametric EQ, 3 PPI amps..
I have very little noise, mostly noted when the seat heaters and defrost are
on.

You need to have several things in place to eliminate most noise,
a) TOP of the line equipment. Each PPI amp has very good noise correcting
inputs. They work well.
b) Be sure you don't run ANY low level wires down either side under the door
trim, BAD place in many cars. Really bad in this Audi.
c) Keep grounds as short as possible, and as low impedance as possible.
Clean all surfaces and seal after your done where the ground wire goes.
d) cross power lines at 90 degrees only.
e) follow all well know wiring practices.

Noise filters rarely take the noise out, and if you use them on the low
level lines you will inevitably loose signal quality.
I have been running high end stuff in Audi since he late 80's. They do have
a noisy electrical system. The factory wires are too many and too small in
cross section.

Hope that's not too much run on.

Mark S
----- Original Message ----- 
From: "Scott Munger" <scottmunger at cox.net>
To: "'Bob DG'" <bobs6 at msn.com>; <ray at s-cars.org>; <s-car-list at audifans.com>
Sent: Tuesday, December 23, 2003 10:27 PM
Subject: RE: [s-cars] Bose Woes

> Does anyone know the impedence of the factory speakers?  I was under the
> impression that you couldn't drive them with an amp or head unit that
wasn't
> 1 Ohm stable.
>
> I have an aftermarket head unit w/a CD changer and have a lot of
alternator
> noise and electrical interference (gets more intense the more accessories
> that are on).  I've researched my options before and even had a stereo guy
> check it out.  I've a line leveler and a noise filter on the power lead.
>
> Thoughts?
>
> --Scott Munger
> '93 S4
> '02 Jetta GLX  replaces '97 Cabriolet - Let out to pasture
>
>
>
> > -----Original Message-----
> > From: s-car-list-bounces at audifans.com
> > [mailto:s-car-list-bounces at audifans.com]On Behalf Of Bob DG
> > Sent: Tuesday, December 23, 2003 5:03 PM
> > To: ray at s-cars.org; s-car-list at audifans.com
> > Subject: Re: [s-cars] Bose Woes
> >
> >
> > All,
> >
> > Problem solved. My installer used I believe what ray is
> > discussing below (my
> > electro jargin is poor). No alternator niose or popping. Part
> > of the problem
> > was that he had to go in and fix a bunch of other people's
> > mistakes. The car
> > had a aftermarket Blaupunkt when I bought it, then I made the
> > mistake of
> > taking it to Ultimate Electronics. Seems that the independent
> > shops know
> > what they are diong more than the chains.
> >
> >
> > >From: <ray at s-cars.org>
> > >To: "Bob DG" <bobs6 at msn.com>
> > >Subject: Re: [s-cars] Bose Woes
> > >Date: Tue, 23 Dec 2003 17:04:37 -0500
> > >
> > >"Bob DG"
> > >
> > >Are you running a line leveler to the front factory amp?  If
> > not, your
> > >Alpine deck is likely feeding 4V of power into an amp that
> > is supposed to
> > >receive line level.  I'm surprised you have not blown the
> > front speakers by
> > >now.
> > >
> > >Which Alpine headunit are you running?  You could run the
> > front channel on
> > >the Alpine headunit to the front speakers and bypass the front amp.
> > >
> > >
> > > >
> > > > From: "Bob DG" <bobs6 at msn.com>
> > > > Date: 2003/12/23 Tue PM 04:41:47 EST
> > > > To: s-car-list at audifans.com
> > > > Subject: [s-cars] Bose Woes
> > > >
> > > > Hello all,
> > > >
> > > > I've got the car at a high end audio place to get rid of
> > some alternator
> > > > interference, now I've got more problems...  Alpine deck,
> > factory front
> > >with
> > > > rears disconnected. Alpine amp and 10" tube in trunk.
> > Front speakers are
> > > > being driven by the front factory amp.
> > > >
> > > > Here's the problem. for some reaon I am getting a popping
> > niose when the
> > > > volume is turned on, track is changed, station is
> > changed, powered on.
> > > > Popping comes from front speakers. This could be remedied
> > if we replaced
> > >the
> > > > front speakers, but the size is odd- somewhere inbetween
> > a 4" and 4.5"
> > >(Euro
> > > > size?). Aside from hacking up the door and doing a custom
> > install I'm
> > >out of
> > > > ideas. Unfortunately so is my  installer.
> > > >
> > > > Ideas?
> > > >
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