Question about Behringer K3000fx 300w 4-channel PA Keyboard Amplifier
More infornation is required to provide a real answer, but I can give you a few possibilities:
1) There is a problem within the feedback loop that is allowing some frequencies through. This will be more prevelant at higher volume levels.
2) If there is a tube pre-amp section, the tube can be "microphonic". This too is generally more likely at higher volume levels.
3) Defective components in the amp section. These may pass some DC voltages that will sound like distortion.
If you can, please experiment a little to try to find when the problem is most obvious. With more details about when the problem occurs may give us enough info to determine the cause. Otherwise a trip to a service shop that has access to test equipment will be required.
Posted on May 21, 2011
Is the problem noticed at low frequencies only? If so, a rubbing speaker might be the cause.
Posted on Dec 07, 2014
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Posted on Jan 02, 2017
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