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Behringer Truth B2031A powered monitor speaker - radio interference in left speaker

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A well know problem to the Behringer Truth B2031A speakers is radio interference and noise. I had the same problem with mine and found a solution on a forum!

If you open the speakers, you'll see a cable from the main board that runs to the 2 lights at the front (on/limit LED's). It functions as an antenna... Disconnect it and your speakers are silent, finally. (OK no leds, but I can live with that).

Posted on Jan 27, 2011

  • ZaD MoFo Feb 10, 2011

    Great solution! While not quieting my monitors completely, this tip pointed me toward a complete solution: Shielded wiring for the LED wiring and a screening cover made with sheet metal. If you look at the PCB they are mounting holes for what should had be a shield. (a leftover from Behringer...)

  • stantonalexa Feb 23, 2011

    ZaD MoFo could you elaborate on this screening cover? Where exactly do you put it, and what exactly should it be shaped like? thanks



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Check and replace damaged component/s at its main power supply section. Contact any service technician. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" or "Magazine" will make surf easy. Surf the site with patience. Pull up older posts. Do asearch by type in the brand name of your device at its search box.

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The fuse blows seconds after the unit is switched on. No fatal accident occurred to cause the problem.

One of the power amps has failed. Take unit in for servicing unless you are electronically adept.

Here is schematic:

Scroll down to "get manual" and click on that to download. Ignore other download links.

The unit uses LM3886 power amp chips. Likely one has shorted. Use a 40 watt light bulb in series with the input power cord to act as a resetable fuse to avoid wasting fuses during troubleshooting and repair.

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Just bought a pair of used Beringers Truth b2031a monitors. one of which doesnt work anymore at all... opened the back of it (took those 6 screws out) and saw that the power connection has been cut of......

Here is the service manual schematics for your speakers:

Scroll doen to "get manual" and click on it to download the manual... Do not click on the other downloads at the site, they are for viewers you don't need.

Take the schematics to a COMPETENT electronic service technician to get units repaired. You obviously bought units that had been hacked before...

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i found legit looking schematics here...the pdf includes many revisions, adding to their credibility...haven't put them to the test...,com_remository/Itemid,34/func,startdown/id,16026/

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Check the watts and size on your old woofer and go to radio shack and get a repacement woofer with the same wattage and size.
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