Question about Pioneer DJm 400 Professional DJ Mixer

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I have a djm 400 and it has started producing a buzzing sound through the speakers. I can take the same speaker cables from the djm 400 and hook them up to my backup mixer and the buzzing goes away. What could be wrong with my djm 400

Posted by jdadub on

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Ben Armstrong

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Does it buzz through cans? (headphones). Try listening on headphones (turn off any amps and speakers) on cue to each channel you use and to the master output. is it stil there? if so it's an all round earthing fault. If it's all good through the cans (sorry...I mean headphones), try it with the amp/s on again. If the buzz is back it souds like the screen on the main audio output connecters has come off inside.
It's a quick fix, but if you have never used a solder iron, take to someone who has.

Posted on Jan 07, 2011

Testimonial: "Great start need a little more help"

  • 5 more comments 
  • jdadub Jan 07, 2011

    Yes I can hear it in the cans with the speakers and amp off. So you are saying its a grounding issue?

  • Ben Armstrong Jan 07, 2011

    Yes I am :)

  • jdadub Jan 07, 2011

    The mixer only uses a 2 prong power cord, so what do you suggest I do? Thanks alot for your help.

  • Ben Armstrong Jan 08, 2011

    Sorry about the delay. OK, out of interest, canyou unplug everything going into your mixer like decks, cdjs, mics, connections to amp etc. Litterally we want just your mixer plugged into the mains and thats it.
    Ok now plug in headphones. Have a play with all the controls. Is it still buzzing?

  • jdadub Jan 08, 2011

    Ok unplugged speakers and cdjs. Still can hear buzz in cans. Thanks again!

  • Ben Armstrong Jan 09, 2011

    Hi again. It could be one of two problems, but you will need to take it to a service centre to get it repaired. IMO its at worst (and my main diagnostic) the internal power supply. It's either already damaged or on the way out. If you are experienced with electrical repairs, meter across the internal supply. If you ate lucky, it could be just a faulty component on the output stage.

  • edit2web Apr 25, 2011

    out of interest do you have a laptop plugged in the the same mains as the unit?

    If you do unplug the laptop from the mains and see if the buzz is still there, if its gone then you need to buy youself a ground loop isolater you can get them from any good electrical store or on ebay.

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2 Answers

I have a djm 400 and it has started producing a buzzing sound through the speakers. I can take the same speaker cables from the djm 400 and hook them up to my backup mixer and the buzzing goes away. What...


Since it works with your other mixer, the DJM400 is probably fine. You have a ground loop.

Make sure ALL, and I do mean ALL... (re-read that if there is any confusion) interconnected equipment WILL BE powered from the same receptacle or source. If speakers or amps are powered from one place and the DJM is from the other end of the room you likely have a ground loop and you can ex[ect buzzing. Run extension cords alongside the audio leads if necessaryy to carry power from where the amps or speakers are plugged in back to the DJM400 and ANY pther connected equipment.

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If your CD player works hooked up to the DJ board, then try hooking the line out of the board into a auxiliary in or line in in or record in on your receiver using the appropriate cables.Try the CD in first and if there is too much signal then use the CD/Tape in. You need to match the output signal of your board to the input signal of your amp. Hope this helps.

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I have a djm 400and a pair of active behringer speakers model b2031a an im gettin no output from then what am i doin wrong the leads are male to female in the back of the speakers an obviosly like a phone...


First, we need to get the terminology correct.

The DJM has "PHONO" (RCA) jacks, not "phone jacks" of which the current usage is normally the 1/4 inch diameter.

You would be going INTO the Berhinger 1/4 inch jacks on the back of the speakers since you are not using the three pin XLR connections that are used for balanced lines which the DJM does NOT have.

So you should have RCA plugs to 1/4 inch plug cables. The inputs on the 1/4 inch will take TRS connections. IT IS possible you may need to use an RCA to TRS cable with the signal on the "ring" rather than the "tip" of the connector.

A test of the speakers is to touch the tip of the RCA plug with the speaker on and you should hear a hum.

PLEASE be aware that these speakers are INTENDED for use as studio monitors by the sound man in the booth and NOT for playing loud at a venue for dancers, etc.

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That is happening because your grounds went bad. Without grounds, then the amp will produce a buzzing sound. I would replace the input wire, that is probably the problem

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This may not be the correct solution, but have you checked the switches on the back of the DJM-400 to see if one output is set to "PHONO" mode?

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could be a few things , what have you tried to trouble shoot the problem ?
My steps would be ;
check all leads (even if you KNOW u pluged them in)
check the gain is set corectly .
check the line phono slectors are set to what ever you have you leads pluged into on the back of the mixer ( there is 4 red and white RCA plugs , 2 for phono,2 for line CDJs shold be using line )
if you are using digital cables to conect your CDJs , on the back on the mixer there is a small switch marked "CD or digital" make sure that is sleceted "digital " . if ur not using digital cables make sure it is on "CD" .
the info iv put here is based on the DJM-800 so your mixer my not have some of these featers as iv never used a 400 . hope this helps dued . check out www.djtutor.com for more tricks and tips . Pratices'N'enjoy !

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