whizzing sound aaargh!!!!!!

[NIZ180]

OK I am finally sick of it. After owning my 180 for bout a year and a half I have been putting up with this whizzing noise every time i turn the stereo on. It gets louder with the more revs i give the car. Can anyone help

[pearlvk]

No help, but does it have a cd player in it. But was it put in before you had the car.

[demuire]

Sounds like you're getting some "feedback" through your stereo. I'm guessing you've got an aftermarket stereo...

I had that problem when I first connected up my stereo in my Colt (chose a different earth and power lead and the problem went away - it was just a simple headunit, nothing else).

Also had the same problem with the Excel (headunit and amp in the boot), re-ran the wiring and it was all sweet. You have to make sure your power and signal leads are not together or your signal leads (speaker wires, RCA's or whatever) will be affected by the power lead. I ran the power cable on one side of the car and all the signal leads on the other.

[NIZ180]

OK sweet i will give it a go. Thankyou

[teK]

Keep RCA cables away from the amp power cable and any other power cables, away from the ECU, away from cruise control computers, alarm modules etc. Run RCAs along the other side of the car separate from all other stereo cables, if they must cross at some point make sure they are perpendicular, not parallel. Check ground connection for head unit and amps, try another ground point if necessary. Last resort buy a high end head unit with 4V pre-out which decreases alternator whine susceptibility immensely :).

[tomee]

if its aftermarket unit run ur power on the right side as this is where mostly all factory power cables run in ur car,and run the remote wire with it..... on the left run ur RCA's and speaker cables, or rca's throught the middle... what i did for a trial run was run the wires outside of the car and turned on the engine to hear for any noise.

if you have multiple amps ground them all at the SAME point...this can be achieved through running 8gauge from ur amps to a distro block and lead a 4gauge out to the grounding point. make sure u sand down the paint to bare metal as to get good contact.

if you have passive x-overs mounted in ur kick panels they are probbaly pickin up noise through there as thats a problem i once had....

also make sure the power and speaker wires dont cross paths for a long run.

hope this helps

[GMHVNS]

Originally posted by teK
Last resort buy a high end head unit with 4V pre-out which decreases alternator whine susceptibility immensely :).

umm well not really, more like its puts a 'stronger' signal down to the amps, which in turn means you dont need to turn up the amp's gain's as much to yield the same result in output.
if there's noise in the system, simply putting 4V pre-out deck won't fix it as its just a band-aid solution so to speak.

all the other advise in here is pretty much spot on so try that out first and see how it goes ;)

[teK]

I believe that the higher voltage pre-outs are less susceptible to EM interference simply because there is a lower voltage diffrential between itself and other 12V lines. If this isn't the case then why don't speaker wires pick up interference when you run them next to big 4GA cables carrying 50A or so? Correct me if I'm wrong :).

[tomee]

good to see you hop on adam! :)
been lurking around for abit ey?

[GMHVNS]

hey tomee :D yeh just found it actually, and already getting into a discussion, hehehe

tek - that theory doesn't seem to far fetched, but honestly i don't think it holds that much weight compared to the very simple point that i already made. tho honestly i dont know for sure or not if it is correct or not so im not about to bag it :)

[MYGTST]

tek is absoloutley right

the whizzing sound you hear is a combination of alternator whine and ignition noise

there are ways of eliminating this but it dosent always work

the best way to rid yourself of the noise is to first try replacing the noise suppression capacitor on the altenator because these are a common problem

then if that fails try a noise suppressor on your ignition coil ( if you have one )

if all that dosent work then you can install a line driver on the output of your deck( this is a little amp that boosts the rca signal)
if you use this make sure it is as close to the deck as possible


if all that dosent work just replace the deck with one which has a high rca output like 4v or more
and turn down the gain on your amp

i have seen this problem many times and solved it with these steps
sometimes it is as simple as a noise supressor other times a new deck is called for


hope this helps