Question about Behringer Bx4500h Ultrabass 450w Bass Amplifier

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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.

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

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

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


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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..

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