Question about JVC Ks-U58 Input Adapter To Stereo Mini Plug

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KS-U58 JVC Input Adapter Cable

My JVC headunit does not have an auxiliary input, so I'm considering purchasing this cable. and other places online offer this cable for about $40 and the picture shows some type of converter box for it. However, all the KS-U58 cables on do not have this box but are still advertised as the same cable and are offered for $14 shipped.

My question:
What exactly does this box do, and is it really necessary? It is very tempting to buy this cable for 1/3 of the price, but I do not want to risk damaging my iPod or headunit.

Posted by on

  • joshua493 Feb 04, 2009

    I also am looking for the KS-U58 adapter and am wondering what the black box on the unit that is sold at online retail stores does vs the ones on ebay which do not have the box. Is this just a ground loop back and is it nessisary?


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Just installed a 'generic' KS-U57 (same as the KS-U58, but terminates in a RCA, $7 on ebay) that has the same black box--except I cracked the black box open and found that it is empty (only contains soldered connections). I imagine that the authentic JVC is the same.
I have a noise problem (engine static), but it is because my mp3 player is charged by the cigarette lighter--unplugging it eliminates the noise, so as far as I can tell, there is no need for a noise filter inside the KS-U57.

Posted on Jul 30, 2010

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Well i brought one of those cables without the box and it just wont play my music??? this is a reply from jvc
Hi I have a JVC kdg421 head unit, It has a jack lead coming out of the
> back and i brought a j-bus cable.
> I tired pluggin in my ipod and my phone! but it would not recognise it,
> So I was wondering would the KSU58 be the right adaptor for my needs?
> would this play my phone and my ipod?. why is this head unit not the
> same as others!! my old sony I could plug everything straight in without
> spending £30 on an adaptor..
> Thanks for your time, a quick response would be appreciated.
> Aaron------------------------------------------------Hi,

Yes - in order to connect an external source, you'd need either the
KS-U57 or KS-U58, depending on the type of input connection you require.

Kind Regards

hope it helps

Posted on Oct 16, 2009

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Thank you, I had been wondering if it was in fact a ground loop or noise filter.

Posted on Mar 08, 2009

  • rogreg Aug 28, 2011

    You dont need any of the cables above if you want to connect you ipod or mp3 player, my son has the JVC KDSH1000, all youdo is pull the stereo out, and you should see two speaker jack plugs, one red and one white, see what plug you need for them, what you need is a red and white phono jack on one end, and a single phono jack for the other end to go into the head phone jack on your ipod or mp3,plug the two phono plugs into the two on the car stereo, then the other end into the ipod or mp3 player head phone jack,, turn on your car stereo, then source then go to line in, turn your ipod or mp3 on and play your music through your car stereo.


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I had bought the cable on ebay that has the RCA inputs for $1.99...I wish I had bought the actual part. There is so much noise interference, every time I accelerate you can hear the "revving" of my engine through my speakers. So I am thinking the "box" is a ground loop/noise filter.

Posted on Mar 08, 2009

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