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

[Robert W. Garven Jr. (rgarven]

Thanks for all the input. I know its the solid core wires causing this  
just pissed as the cassette never had any noise I keep thinking that  
the wire from the battery is acting like some kind of antenna picking  
up the signal and passing it on to the rest of the wires???






On Mar 8, 2009, at 6:38 AM, rolindsay [at] yahoo.com wrote:

> Robert, here are a couple of things to try.
> 1) Disconnect the ground wire from the seat frame and connect it to  
> the same point where the radio is grounded. Test. This will address  
> the ground loop question before you go buy possibly useless parts.

Did that no change



> 2) With the original ground in place, attach a new hot wire from the  
> radio power to the sub, negating the #10 wire for now. Test. This  
> will test for noise entering from you new power wire. Don't crank it  
> up too high, just test for noise.  Even if you do crank it, the  
> worst thing that would happen is you blow the fuse in the radio  
> circuit.


Did that with the same wire powering the radio, no change.

I also moved the RCA wires and power wires away from each other and  
disconnected the antenna,  no change. It is definitely ignition  
noise.  I have
a question there is a black box that is attached to the power and  
ground leads off the cassette. I seems like some kind of filter. I  
guess new cars dont need them due to all the
computers and EMI stuff. What is this box it is about 2x3" square.  
Could I get another box like that and add it right in front of the  
power and ground in the sub amp.  My next
test is trying to send the input into it by the high power speaker  
leads, not my preference...  What about resistor plugs?


> That seems to me to be the best tests. You have already verified  
> that the noise is not coming in the RtCA leads, just made worse by  
> them.
>
> Please let me know the results of your tests.
>
> Rick - electrical engineer and sound man before becoming a  
> geophysicist.
> Sent via BlackBerry by AT&T
>
> -----Original Message-----
> From: "Robert W. Garven Jr." <rgarven [at] gmail.com>
>
> Date: Sat, 7 Mar 2009 18:05:48
> To: rolindsay<rolindsay [at] yahoo.com>
> Cc: The FerrariList<ferrari [at] ferrarilist.com>
> Subject: [Ferrari] Need help with stereo in Ferrari
>
>
>
>
> All,
>
> 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!
>
>
> I took everyones advice and ran a 10 gauge wire from my battery to the
> subwoofer, with a 10 amp fuse around six inches from the post. I spent
> around 4 hours removing the screws, seatbelt, shift gate etc so I
> could access the underside of the stereo. I hooked up all the wires
> and before i put it back together I mage sure it worked and it sounded
> great. Fast worrward 8 hours putting everything back and cleaning etc.
> I pull the car out of the garage
> fire it up and evenj with the stero off I get a loud crackling through
> my speakers! I unhooked everything one wire at a time and it seemed to
> be the expensive street wire RCA cable that attached from the back of
> my cassette deck to the subs RCA inputs!
>
> I removed everything again and this time cleaned up all the wire under
> the radio etc and tried a rockford fosgate shielded RCA cable this
> time started up the car and no crackling!! Great!! I put everything
> back together ( again) and pull the car out of the garage and this
> time the sub is making a weird gurgling sound, I remove the RCA plugs
> and this reduces it but it is still there.
>
> Here is my problem?
>
> I am running solid core wires and NGK BP6ES plugs. I know. I know, but
> the car runs great with the wires and I will do without the sub before
> i remove them! Will a resistor plug solve my problem?
>
> Remember my stereo (cassette) never had any noise ever (the radio did
> but I dont listen to that). The sub has high powered speaker leads
> which I could try but the unit is obviously making weird nosise with
> only the power attached an no inputs so I am nt sure that would be
> much better. This thing sounds great with the car off and gives just
> enough bass to make the 4" speakers sound great. I anyone has any
> suggestions.
>
> I know you guys are going to say no but it seems that interference is
> coming from my ignition being picked up by the power wire and the RCA
> cable (but the cassette sounds fine). Since this is such a small 70
> watt unit why cant I hook it up to the same power wire that my
> cassette is hooked up to eliminating the 10 gauge wire.
>
>
>
> Rob
>
> Thanks for all your help in advance. If a resistor plug might work I
> would like to try that as changing plugs is about 10 times easier than
> removing the console again!!!
>
> 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
>
>
>
>
>
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