These tests examine the effect of the Cutting Edge Filter (CEF) which is a steep high pass filter originally designed by Charlie Hall to remove any muddiness in the guitar tone by filtering out the unwanted low end frequencies.
CEF: OFF, Presence: MIN.
CEF: ON, Presence: MIN
The gain now drops off steeply below about 400 Hz; for example at 200 Hz the gain goes from about -7.5 dB with the filter off to about -22 dB when it’s turned on.
But what’s with the rise again around 80 Hz? It’s probably not significant as the gain there is still about 8 dB down on the response from 1000 Hz up.
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