I would check it with a different instrument cable AND bass guitar. If you end up with the same results, it's a thermal issue with the amp and will require factory authorized repair. The amp heats up and the intermittent component starts failing....more heat, more failure. It's not an easy fix and your Behringer repair shop will have their work cut out for them with this repair.
SOURCE: hey, just purchased some behringer
The setting of the volume controls bears LITTLE importance to the actual level the unit is being run at since one can send high levels INTO the units from the source. These are intended to be used in a studio for the audio engineer to listen to in a small room. They should really be no louder than a consumer BoomBox maximum.
A squeaking noise is not normal at a level such as mentioned however. You might see if the noise is from the speaker itself or possibly parts of the cabinet... Plastic parts are NOTED for squeeking and can be suitably lubricated.
Beyond that, since the units are new, you should be able to exercise your warranty.
Testimonial: "I have left a comment under your solution, again thanks for the advice"
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.
SOURCE: I've got a Behringer Ultrabass Bb410 1200w 4x10
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.
SOURCE: As soon as I turn
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.
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