BH250 / BG250: High frequency noise from the amp itself (not in speaker)

Question

I notice a high frequency noise coming from the head itself.

Answer

It is absolutely normal. 

The Power supply transformer produces a small hiss, that also combines with the cooling fan. This noise level is pretty low and should not be a problem when playing live.

(for BH250) If you need to mic the cab with a condenser microphone in studio,  try to place the head a bit further from the cab (use a longer cable) speaker


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