Question about Behringer Bx4500h Ultrabass 450w Bass Amplifier

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

How do i fix it

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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..

Posted on Jul 31, 2010

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I've included a link which provides information on some of the possible causes for hum in an instrument amp. If all else fails to locate the hum, the hum may be caused by a bad filtering capacitor, possibly in the power supply. I suggest you have the amp diagnosed by a reputable musical instrument shop. Troubleshooting Guitar Amplifier Hum eHow

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You can try repair it. They are pretty basic. I would look for poor solder connections, and reflowing all solder joints in it would be prudent.

The hum is likely from a gain stage with a bad solder joint on the input isolation capacitor. Also check other wires and check for bad solder connections on the pickup connections as well. It can even pick up hum through a bad shieid/ground connection in the jack on the guitar

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"Noise" is not a very good deescription... is it hum? is it static like? is it a buzz? Hum pickup by the pickups of guitars are common and some pickups are worse. If it is hum move the guitar away from magnetic sources like amps, motors, flourescent lights, dimmers... etc. Sme guitars have grounding problems and touching them varies hum. Also, do NOT let the guitar "hear" the amp as it can feedback at frequencies above your hearing even. Do some "sniffing" by moving the guitar and the orientation around the area seeing if you can find hot spots of noise to avoid.

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Humming kind a loud it bothers a lot so anoing.


Unplug the inputs to the amp. If hum disappears, then you need to fix the guitar or the cable or keep the guitar from magnetic fields which are present near amps and other powered equipment. Use of Humbucker pickups helps a lot. If amp has objectionable hum with inouts unplugged, take it in for repair.

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If you unplug the guitar cable and STILL get the hum, the unit has a defect... return under warranty.

If the hum goes away when you unplug the cable, replace the cable and see if new cable fixes the problem. If it does, the cable has a bad shield.

If the cable didn't cure it, then the guitar has a defect. Remember that some guitar pickups are sensitive to the magnetic fields from the amps... only cure is to either use humbucker types or be a distance away from the amp.

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You likely have a bad input jack. A VERY common thing with these. They don't like to work on the jack because one has to remove too much to replace it. Lazy shop! Sometimes the solder has just broken loose or the board pads damaged. Replace the jack anyway as they take a beating.

Find a shop willing to work on it properly and DON'T accept it back until it is fixed!

Another problem with amps can be the preamp output jack switch which fails to close leaving the amp dead... but it usually won't hum much when that happens.

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Try this before it fails to see what to expect in the way of the hum from this test.

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