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Thank you for the handy tip on how to fix my amplifier. I'll still have to take it to a registered Behringer repair man, but at least I'll be able to help him pinpoint the problem quickly.Thank you for the handy tip on how to fix my amplifier. I'll still have to take it to a registered Behringer repair man, but at least I'll be able to help him pinpoint the problem quickly.
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Try unplugging cables from the inputs, one by one and see if the hum stops. If it does its a ground loop, if don't it could be a leaky filter capacitor in the power supply
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If it's humming when something is plugged into the input, but not when nothing is plugged in, it's most likely the cable. If it hums when nothing is plugged in, the amp is defective and you need to return/exchange it.
If this monitor is humming without nothing connected to it, maybe the electrolytic capacitors from its power supply are bad - they are responsible for filtering the fluctuation at the output of the internal voltage rectifiers that transform the AC input voltage into a DC voltage to feed its internal amplifier.
When they fail, the supply voltage for its internal amplifier that should be flat, continuous, now presents a pulsating profile, according to the mains frequency (generally 60 or 50 Hz, depending on the country you're in). So, the output of the amplifier will be varying at the same rate, producing the humming.
Another possibility is that one internal cable connection that should be shielded is now disconnected or loose and is picking the hum from the internal power supply.
Anyway, maybe you should take it to a service center and have it checked.
Just had the baby brother (ACX450) with this problem...opened the amp... screws from sides and or top (including 2 hidden under handle covers).
The power cable from the power transformer had come off the connector on the circuit board in spite of goo they had put on it. Put connector back on and secured the cable and works perfect,
Since your display lights, yours is likely a different problem. I have also seen similar ones that the cable to the speaker had been pulled off its connection on the circuit board, rendering no sound. See if you have sound at headphone jack. and if none, how about the preamp output jack? Note you will only hear the left side using earphones as these jacks are monaural.
Sounds like it could be feedback hum. Is there anything near it that could cause a reaction when unpluged? Such as a turntable, cassette etc. If so move them and see if it goes away. Even then it won't hurt the amp. I think otherwise worry when there's a hum when they are plugged in. PS check any earth connections too!
The type of cable you use plays a big role
on amps check all grounds, how long it is
has a lot to do with it
You may have a bad cap.inside or even on the
input of your plug.
Based on your description, the internal power supply of the subwoofer amplifier would be suspect. Often it would be a blistered or leaking filter capacitor. It is a relatively easy/inexpensive repair.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information. Good luck and kind regards. Thank you for using FixYa.
Thank you for the handy tip on how to fix my amplifier. I'll still have to take it to a registered Behringer repair man, but at least I'll be able to help him pinpoint the problem quickly.
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