simple ...EP 4000 is not suitable amplifier for hifi ... may be to be used in high power subs so noise of vent doesn't matter anyway ..
I bought an EPX2400 not to long ago as a measuring amp. Replaced the leaf blower fan with a Papst, works just fine. However, I found it cannot be used for measurements because the FR has a condiderable upward slope on the high end. Don't know if this is so for all Behringer amps, but it could be marketing. So, beware.
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