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Old 02-09-2014, 03:34 PM   #1
HLG600
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Arrow Aux Input Whine - My Solution

After installing a factory aux input, I noticed a ton of whine even at moderate volumes when media was not playing through the sound system. It drove me nuts. I looked further into this and after a bit of trial and error came to the following solution.

Items Needed:
  1. BMW Aux Kit - $30 (Local Dealer)
  2. Noise Reducing Aux Cable - $15 (Amazon)
  3. 3.5MM Female Coupler - $2.50 (Amazon)
  4. Ground Loop Isolator - $12.50 (Amazon)
  5. Quality Flat Aux Cable - $10 (Amazon)
I connected the entire setup in the order listed above. Before neatly tucking the assembly away, I used shrink tubing or electrical tape over any connection points and zip tied excess cable together. I'd suggest leaving some slack to avoid extra tension once everything is reinstalled.

Tested everything out and the excess whine is gone at reasonable volumes. If you crank the volume up fully, whine will still come through, but you can still get pretty loud before anything is noticed.

Keep in mind, this whine is isolated to when the input is set to "Aux" and there is no media playing. When broadcasting, audio from music and phone calls come in nice and clear.

Anyway, hope this is of use to someone.
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Old 02-18-2014, 03:30 PM   #2
Marshmallow
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I have an iPod connection through the cd changer and when an iPod is not connected the 30 pin picks up the spark plugs and plays the sound. Is this the situation you are addressing?
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Old 02-18-2014, 03:38 PM   #3
HLG600
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I am by no means an audio expert but I believe it's called ground loop. Some sources also refer to it as "alternator whine" which makes sense since the noise increases under acceleration.
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Old 02-18-2014, 04:25 PM   #4
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Well either way it sounds similar to my issue so I'll have to give this a try. Thanks for the write up.
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Old 02-18-2014, 04:32 PM   #5
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Originally Posted by Marshmallow View Post
Well either way it sounds similar to my issue so I'll have to give this a try. Thanks for the write up.
Anytime. If I were to do this again, I'd experiment with adding a second noise reducing aux cable after the ground loop isolator and plugging that directly into my media source. I initially was worried that two levels of filtering might affect the volume output, but after seeing no loss there I'd be comfortable trying a third layer of filtering.
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Old 02-18-2014, 04:48 PM   #6
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Alright thanks I'll have to play around a bit. I'm hopeful this will solve my interference issue that occurs occasionally while playing music.
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Old 02-23-2014, 10:02 PM   #7
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I've been noticing some extra whine on occasion when connected to the Aux and power source, but it's sporadic, making it difficult to trace. Ordered a higher quality braided charging cable and another noise reducing Aux cable. If there is even the slightest trace of noise after three levels of filtering, then I'll just have to live with it.
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