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General => Car audio => Topic started by: Len on 10 April 2009, 15:24

Title: Rev Whine!
Post by: Len on 10 April 2009, 15:24

Had this yesterday but could only hear it when music soft/quiet and revs high!
Now that usually means an earth problem.
Checked the amp one today and thats fine so what else can I check?
Cant hear it today when car stationary so its a weird one!

Title: Re: Rev Whine!
Post by: gti sa on 10 April 2009, 21:58

potentially a loose earth wire on your headunit..  You may need to add a suppressor to your power lead to the headunit.

Title: Re: Rev Whine!
Post by: Cable on 11 April 2009, 12:29

check the rca cable shilding is ok.

Title: Re: Rev Whine!
Post by: dubbinmk3 on 11 April 2009, 19:57

hmm could try supressor but i never think you should use them personally as its just hiding a problem, ive had this a few times could be rca, could also be a headunit fault.

i brought a brand new head unit once and it wined like crazy, i cheacked everything and turned out it was my radio!

if u disconect the amp do the speakers still get interference? if so its got to be something up front ie: stereo!

 :smiley:

Title: Re: Rev Whine!
Post by: Len on 13 April 2009, 13:12

Cheers guys I'll check those out.

Title: Re: Rev Whine!
Post by: dTEA on 17 April 2009, 11:46

Len did you run the RCA and the power cable down the same side of the car? if so the shielding on the RCA is the most likely problem...phoenix gold are reasonable RCA's...the cheap ones tend to get a fair bit of interference.

Title: Re: Rev Whine!
Post by: Len on 20 April 2009, 14:59

No power and RCA are on opposite side of car.

Title: Re: Rev Whine!
Post by: wampablo on 23 April 2009, 21:34

could be down to bad earths in the actual equipment aswell

Title: Re: Rev Whine!
Post by: Ben Lessani on 23 April 2009, 21:42

Its alternator whine. It can be caused by a multitude of different things, but the main cause is a ground loop. The best way to fix it is to replace the grounds for all your audio equipment, and have them all as short as possible - with the best possible connection.

I can go on for hours, but here is more info...

http://www.mp3car.com/vbulletin/car-audio-faq/79248-induced-noise-ground-loop-trouble-shooting-guide.html (http://www.mp3car.com/vbulletin/car-audio-faq/79248-induced-noise-ground-loop-trouble-shooting-guide.html)

If you don't want to replace the grounds - which you should seriously do as there is a fire risk involved. You can use a GLI (Ground Loop Isolator) about £7 from Maplin, this will plug in behind your head unit and will stop any consequent whine.

Title: Re: Rev Whine!
Post by: Len on 23 April 2009, 21:43

Seems to have gone again! I hate intermittent things! :angry:

Title: Re: Rev Whine!
Post by: Len on 23 April 2009, 21:44

Cheers for the info Ben!  :wink:

If it comes back ...........

Title: Re: Rev Whine!
Post by: wampablo on 24 April 2009, 10:41

groundloop isolators are ok but they can cause you to lose some audio quality best route ould be as ben said go with the earths first.