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KENWOOD KDC-X491 I received the Kenwood KDC-x491 a couple of days ago. It has been installed in my 1997 Audi A6 with Bose system. It all seems to work properly, and is just what I expected, except there is a problem with a noise. When it is switched on there is a LOUD click in the speakers on any source except the tuner. The tuner seems to be fine. But when switching from the tuner to USB (even when there is no USB connected), to CD, or to AUX (AUX is turned on and an MP3 player connected) there is a LOUD click. In AUX the only time the click is heard is when it is first switched to AUX. However, when the source is switched to CD there is a loud click when it is first switched, when the first track begins to play, between each track, when pause is pressed, when pause is pressed a second time to release it, or when the CD is ejected. The volume setting has no effect on the loudness of the click noise. The noise is in all four channels. I am using the pre-outs with the Bose system amps. When the unit is turned off, no matter which source is playing, there is also a click, though it is much softer. All of this occurs whether the engine is running or not. The clidk noise is loud enough that it is not only extremely annoying, but I suspect it could damage the speakers, especially if it continues. Please help. I can't live with this. Doug

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  • DiggyPiff Jan 14, 2008

    Thanks for the suggestions Aviorix. Let me add the following additional info:

    First, I did the most obvious and rechecked my wiring, both with the manual that came with it and with the Bentley factory manual for this specific vehicle. All is in order.

    Second, I don't have a changer connected to the HU. And I have the same problem whether I have anything connected to the AUX input or not. And what makes me think that it is not related to the AUX input, at least not the external connection, is that I have the most noise problems with the internal CD player switched on via the SRC button.

    Any more ideas please?

    Diggypiff

  • DiggyPiff Jan 14, 2008

    Hello Headstrong, Thanks for the suggestion. However, exactly where would you suggest inserting the noise filter? I thought about a noise filter over the weekend, but couldn't convince myself that this would solve the problem as the noise did not seem to be associated with anything going on in the car outside of the functions of the HU. Though the ignition is turned on to "Accessory" to provide power to the unit I have had everything in the car turned off. And there was absolutely no noise problem with the OEM stereo (Blaupunkt) that was removed.

    Please let me know what you think.

    Thabnks again.

    Diggypiff

  • DiggyPiff Jan 14, 2008

    Hello. Please see the details of my problem posted earlier, and the suggestions posted by two of the experts. Though the suggestions have been good, they are not applicable here as the situation is different or I have already tried what they are suggesting. Anyone's help is apprecated.

    Diggypiff

  • DiggyPiff Jan 15, 2008

    Hello Paul, Thanks for the response and suggestion. The installation is in a car with a factory Bose sound system. There is no practical way to bypass the amps (there are three of them) and go directly to the speakers. If I disconnected the amps there would be no sound (I assume even if I left the amps connected but disconnected the power to them). Am I understanding you correctly here?

    Diggypiff.

  • DiggyPiff Jan 15, 2008

    Thanks to all of you that responded with suggestions. I think you have confirmed that the problem is most likely with the Kenwood itself. I didn't want to go through that whole process of removing the unit, sending it back for warranty repairs, waiting for weeks, etc. if I could solve the problem myself, even if it was of my own causing. But I guess that is the course to pursue. I will contact Kenwood today. Thanks again. Diggypiff.

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Hi are you running the unit through an amp if so then try switching the amp off then see if you get same noise as sometimes the feed back from the amp will cause this noise give this a try then let me know outcome ok speak soon

Posted on Jan 14, 2008

  • paul proctor Jan 15, 2008

    hi have you tried see if the noise is still their if you turn the volume right down

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Hi Doug

First of all sorry for the issue that you have. I believe you have some solutions to try. There is 2 possible cause, internal AUX preamplifier is faulty or external AUX connection acquires electromagnetic signals. USB connection wont be fact. But AUX connection (The stereo female input jack) or Kenwood disc Changer Connection might have unshielded spot on its cabling. Disconnect all the AUX cable and Kenwood disc changer connection (if you have). try to check again if problem still occurs. I will suggest you to check manual for the connections once more. Here is the link for the Manual.
http://inform3.kenwoodusa.com/Manuals/KDC-MP435U.pdf

After ensure everything is correct, if issue still persists contact Kenwood
1-800-KENWOOD (536-9663)



Good Luck

Posted on Jan 14, 2008

  • ExpressFiX
    ExpressFiX Jan 15, 2008

    I like to be realistic and give you most convenient solutions. I was determined when I post solution. You have clarified that there is no cause by AUX connections. So second option will be considerable which is contacting the hotline of the manufacturer. There are many way to troubleshoot but issue is more related to internal parts and AUX amplifier. Since you got it new why don't you contact kenwood. So they can provide you proper guidance for their own product. About modifying the connections; (adding on auxiliary parts) It might void your warranty I suggest talk to Kenwood first.

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  • 233 Answers

Have you tried a line noise filter? such as these

hope this helps
thanks for rating

Posted on Jan 14, 2008

  • 1 more comment 
  • Pedro
    Pedro Jan 14, 2008

    this maybe helpfully

  • Pedro
    Pedro Jan 14, 2008

    You need to look at the manufacture specs for the filters, they work in line but some are installed differently



    look at this: this is usually what a filter does, but a cap is ~$1

    Accessory pop is associated with one particular electrical event in the vehicle. This can be switching on your turn signal, headlights, brakes, windshield wipers or even the rear window defrost. These high current drawing accessories are causing a voltage spike that is traveling into your car audio equipment with the result being heard as a sharp pop. Adding a small bi-polar capacitor (0.47 uF) between the accessory's power wire and ground will often absorb these surges.



    full link here

    (good luck)

  • Pedro
    Pedro Jan 15, 2008

    Hey DiggyPiff

    just a quick note: you mentioned that you had no noise problems with the OEM stereo (Blaupunkt) right?.

    is it not possible your kenwood is the problem? assuming you where using the amps and such with the OEM too.



    good luck

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Posted on Jan 02, 2017

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SOURCE: how do i turn off the loud on my kenwood kdc-x491

http://inform3.kenwoodusa.com/manuals/KDC-MP435U.pdf

Look at page 9.

Posted on Feb 09, 2009

foskorider
  • 79 Answers

SOURCE: kenwood kdc-x491 wiring diagram

red, yellow, black/ign constant ground
blue, blue white stripe/rem pwr ant
grays, whites, purples, greens/ front front rear rear
its the same on all headunits except cheap *** wal mart headunits

Posted on May 18, 2009

barnes07
  • 16 Answers

SOURCE: I Need A Faceplate for my KDC-X491. Any ideas I

I think your best bet is to get a new cd player

Posted on Apr 08, 2010

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