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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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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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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