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Old 29th September 2008, 15:18   #1
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Default Humming Noise after amp install.

Hello gurus,
I installed a sony amp. i have no sub-woofer. connected the 4 spekers to the amp.

after install, when i start the engine a humming noise comes and when i accelerate to change the gears it becomes more. if i switch off the music system the noise stops.( this noise i hear if i play the music with 0 volume :-) )
i went and showed to the guy who installed the amp, he said some earthing problem, took some 300 buck for some JBL cables for the connection between the music system to amp. previously he was using a local adapter.( my HU(JVC)has only 2 channel but the amp is 4 channel, so i guess that cable converts 1 to 2 - adapter).
after this the noise has reduced but when i switch on my AC the noise still comes.

also that guy told if still the humming noise comes, the earthing in the HU circuit should be disabled(thats what i understood)

any idea ???
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Old 29th September 2008, 16:18   #2
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the installer knows nothing. this is a earthing problem and it is better to go to a good installer
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Old 29th September 2008, 16:26   #3
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Check if this CD is playing in your HU...

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Old 29th September 2008, 16:30   #4
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Thats strange ? Why this CD ?
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Old 29th September 2008, 16:30   #5
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Quote:
Originally Posted by gunbir View Post
Check if this CD is playing in your HU...




good one sir ji
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Old 29th September 2008, 16:54   #6
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that is funnny gunbir as i told you the other day you have a
great sense of humour
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Old 29th September 2008, 16:57   #7
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Ok good humor but can someone knowledgeable please help him please, is he referring to alternator whine? If so how can it be rectified?
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Old 29th September 2008, 16:57   #8
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^^
Oops I miss the subtle point :P I never thought Gunbir would crack such a witty joke.

Anyway, somebody help the fellow as well.
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Old 29th September 2008, 17:01   #9
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Same problem was with my Honda City
Some earthing problem
sorted pretty easily.
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Old 29th September 2008, 17:01   #10
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Quote:
Originally Posted by madhukar_n View Post
any idea ???
Madhukar, is it a Pioneer HU you are using? They are notorious for the pico fuse related ground noise issues. Search around, there is a thread (by clipto333 I think) where the solution has been discussed.

Sorry for the joke in your thread, I couldn't resist.
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Old 29th September 2008, 17:11   #11
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Quote:
Originally Posted by gunbir View Post
Madhukar, is it a Pioneer HU you are using? They are notorious for the pico fuse related ground noise issues. Search around, there is a thread (by clipto333 I think) where the solution has been discussed.

Sorry for the joke in your thread, I couldn't resist.
i guess it was humming for kimi kathkar !!

anyway, the HU is a JVC.
so it is a earthing issue ?? nothing else right ?
i will ask him to rectify it and if does not solve will show to a better installer.
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Old 29th September 2008, 17:17   #12
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Quote:
Originally Posted by gunbir View Post
Search around, there is a thread (by clipto333 I think) where the solution has been discussed.
Is this thread http://www.team-bhp.com/forum/diy-do...alt-whine.html

Quote:
Sorry for the joke in your thread, I couldn't resist.
Superb, good sense of humor.
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Old 29th September 2008, 17:23   #13
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Quote:
Originally Posted by gunbir View Post
Madhukar, is it a Pioneer HU you are using? They are notorious for the pico fuse related ground noise issues. Search around, there is a thread (by clipto333 I think) where the solution has been discussed.

Sorry for the joke in your thread, I couldn't resist.
It was posted by s0uljah here is the link of the same...

http://www.team-bhp.com/forum/413720-post5719.html
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Old 29th September 2008, 19:20   #14
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Quote:
Originally Posted by gunbir View Post
Check if this CD is playing in your HU...

Awesome!
Quote:
Originally Posted by nitin.dangayach View Post
^^
Oops I miss the subtle point :P I never thought Gunbir would crack such a witty joke.

Anyway, somebody help the fellow as well.
Why did you underestimate Gunbir's sense of humor?

On another note, I am also facing alternator whine. Got the Ground Zero RCAs checked, earthing checked and also reduced the gains on the amplifier. Nothing worked.

My installer suspected it the infamous Pioneer blown IC issue. However, we tried with an old Pio HU but the whine was still there. So could it really be Pio HU problem? If yes, then it has to be a great coincidence that the replacement old Pio HU also had a blown IC.

So what can the culprit be?
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Old 29th September 2008, 19:33   #15
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Quote:
Originally Posted by nishantgandhi View Post
On another note, I am also facing alternator whine. Got the Ground Zero RCAs checked, earthing checked and also reduced the gains on the amplifier. Nothing worked.

My installer suspected it the infamous Pioneer blown IC issue. However, we tried with an old Pio HU but the whine was still there. So could it really be Pio HU problem? If yes, then it has to be a great coincidence that the replacement old Pio HU also had a blown IC.
It is probably the Pio HU. Its not an IC but the pico fuse that blows. All you have to do is ground the outer metal of the RCA plug to the metal of your car. See the links in this thread. They have instructions and pics.

Quote:
Originally Posted by madhukar_n View Post
anyway, the HU is a JVC.
so it is a earthing issue ?? nothing else right ?
i will ask him to rectify it and if does not solve will show to a better installer.
Do try some better interconnects too. The JBL cables you bought are fakes. They are no good.

Last edited by gunbir : 29th September 2008 at 19:35.
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