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My behringer ultrabass bx1200 has a loud hum. it does not play at all

I tested a 4 ohm speaker on it

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SOURCE: Behringer's Ultrabass BXL3000 Gain knob broken

You need to replace the potentiometer with the broken shaft. You can open the unit and try to get a part number or go to Behringer parts to get an exact replacement. The pot must be matched for value, taper, and mounting and shaft dimensions.

Posted on Jun 07, 2010

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SOURCE: My Behringer Ultrabass BX600 has a very loud,

It is likely the power amp chip has shorted. This puts the unregulated dc into the speaker and you will hear the hum. DO NOT operate this way as you can burn up the speaker. You will find that the LM3886 chip on the heatsink has failed. They are about $7.30 from Digikey. They come in two lead bent versions. Make sure to get the correct version and use heat sink grease wheen installing.

Posted on Nov 28, 2011

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Direct out kills speaker signal on my behringer bx1200


If it's still under warranty, get it replaced. Otherwise, take to an authorized behringer repair shop, or your local pro-audio repair shop.

Apr 12, 2012 | Behringer Ultrabass Bxl450 45w 1x10" Bass...

1 Answer

As soon as I turn the volume over approximately 40W, the speaker keeps moving while making an awful sound at the same rhythm. I believe the speak may be burned. Is there a way I can fix it or I have to...


How do you know you are at 40 WATTS? This takes electronic test equipment to measure.
Tests to run. Observe the speaker cone with power off. Now turn it on... did it displace and stay there? If so you have a failure of the amplifier itself. Next, If you can place finger on the cone, move it gently in and out feeling for any roughness. If you feel roughness, the voice coil is fried and you be buying new speaker. A lot of the Ultra bass Behringer's use LM3886 power amp chips... sometimes in parallel, and a failure of one could cause this.

Aug 23, 2011 | Behringer Ultrabass Bxl3000

1 Answer

My Behringer Ultrabass BX600 has a very loud, constant hum. I tried a new power cord, and speaker along with checking the internal parts for a burn spot and tight fit to no avail.


It is likely the power amp chip has shorted. This puts the unregulated dc into the speaker and you will hear the hum. DO NOT operate this way as you can burn up the speaker. You will find that the LM3886 chip on the heatsink has failed. They are about $7.30 from Digikey. They come in two lead bent versions. Make sure to get the correct version and use heat sink grease wheen installing.

May 26, 2011 | Behringer Bx4500h Ultrabass 450w Bass...

1 Answer

It seems I've got a loose contact at the input socket, how do take the amp out so i can open it up and fix the connection?


For some reason that model number doesn't appear to be valid.

HOWEVER... look for screws from teh side where the amp chassis is AND sometimes Behringer HIDES screws holding the amp under the covers where the handles are. These cover snap off after a fashion... one has to pry sideways near where the rubber/plastic goes insidethe cap and pry ONLY the plastic part sideways to release the cap. There is a metal piece inside so the pry has to be on about the first 32nd of the plastic. The screws under this also hold the amp. Under the amp are wires to the speaker... Be careful to not damage them... USUALLY the amp goes out the front. I have a BX1200 so mine may be different.

Mar 29, 2011 | Behringer Ultrabass Bxl450 45w 1x10" Bass...

1 Answer

The amp turns and everything but it doesnt pick up sound. the day it busted it wasnt as loud as it used to usually i could put it on 4 and drown out my guitarists but i put it on full blast and it was...


Most of these use two stick type amplifiers driving the speaker in what is called "bridged mode". If one of the sticks fails, the unit will do what you are observing. Unless you are adept at electronic repair this is NOT DIY.

Here is a BX1200 that uses a pair of LM3886's in parallel rather than bridged mode as it is a smaller unit. You will find simularities though. Your unit will either use the 3886's of possibly either TDA7293's or TDA7294's.

http://elektrotanya.com/behringer_bx1200_sch.zip/download.html

The file is compressed and has two sub files with different revision levels. Click on the brown dot in the upper left to download.

Feb 14, 2011 | Behringer Ultrabass Bxl3000

1 Answer

I just want to know the no. of the power amp ic


Here is a SM for the BX1200... it is LIKELY similar to the BX1800... they don't re-engineer very much.

http://elektrotanya.com/behringer_bx1200_sch.zip/download.html

The 1200 uses a pair of LM3886's in parallel the BX1800 MAY use the same amp. You will find a LOT of commonality among the amps in the same series.

You sometimes find TDA 7293 and TDA 7294 in this audio equipment.

Feb 11, 2011 | Behringer Ultrabass Bx1800 Bass Combo 180w

1 Answer

I have a behringer bx4500h. pre-amp board has a noticeable hum that also reacts to tone controls. I need a schematic to fix it. Can you direct me to a schematic of this unit?


Behinger normally doesn't give schematics... However here is a link to a BX1200 schematic at a foreign site. OFTEN they use the same circuitry within a series of equipment.

http://elektrotanya.com/behringer_bx1200_sch.zip/download.html

Note it is a zipped file of both F and H revisions.

Please note that the symptoms you describe are NOT usually something you will find in the preamp, but rather in the interconnections. It appears that the BX1200 uses TRS inputs at the jacks... not sure what your BX4500 does...

Make sure ALL your interconnected equipment is powered from the SAME receptacle to avoid ground loops and hum. Use balanced lines everywhere possible.

Dec 07, 2010 | Behringer Bx4500h Ultrabass 450w Bass...

1 Answer

I've got a Behringer Ultrabass Bb410 1200w 4x10 Bass Cabinet in which 2 of the speakers rattle. I know the speakers have been removed and rewired. How can I get an internal wiring diagram to check...


The cabinet is listed as a 4 ohm unit.

We would exoect to see four, 4 ohm speakers in series parallel or four 16 ohm speakers in parallel.

If teh unit seems to rattle, first put an audio oscillator into it and sweep the frequency. It is common for grilles and also logos attached to them to rattle.

Open the unit and power each speaker the same way individually for a test.

I suspect you will find either the grille or mounting hardware is actually doing the rattling OR possibly the wires inside are vibrating.

If the sound is a scratchy buzz, then the speaker(s) have probably had voicecoils damaged by overheating.

In this case, buy 4 new speakers and replace all. It is not likely to find replacements for the Buggera brand they put in these cabinets. Also the word on the web about that brand of speaker is not very good.

Sep 21, 2010 | Behringer Ultrabass Bb410 1200w 4x10 Bass...

1 Answer

I have troubles with a to little speakersound i have checked the fuse and its okay its a new one for me this pmp5000 can you tell me i have 1000 watt speakers do they not play loud with this


These can develop around 500 Wattts or so into speakerss that are 4 ohm.

If your speakers are 8 ohm the max power to each is around 250 Watts.

The efficiency of your speakers may reduce the loudness . The power rating of your speakers really has nothing to do with the loudness, only the power that can safely be sent to the speaker.

Sep 15, 2010 | Behringer Europower Pmp5000 Powered Mixer...

1 Answer

Behringerbx4500h amp has a bad hum i here the have this problem


If the hum exists with NO input cable plugged in, this requires repair, most likely in a shop familiar with the unit.

The problem may be in the unit's power supply or a broken connection inside.

This problem can also happen if one of the oputput amp transistors shorts driving out DC current into the speaker which is a grave risk to the speaker. Check the DC out of the speaker connector. If it is NOT very near zero, say less than 0.1 volts DC, do NOT copnnect speakers..

Jul 13, 2010 | Behringer Bx4500h Ultrabass 450w Bass...

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