Bettermaker EQ 502P - Manual (Page 17)

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Simple HF Cutting: The PEQ’s high frequency attenuation is a first order shelving filter with selectable cut
frequencies of 5 kHz, 10 kHz and 20 khz, and a range down to -15 dB. Like the low frequency section, the cut
frequency is specified at the maximum cut amount (pictured below).
PEQ, high frequency attenuation of 8 at 5 kHz (red), 10 kHz (orange) and 20 kHz (blue)
Combining HF boost and cut: Here’s where the fun begins! Suppose you are mastering and need gentle
presence for the melody instruments right up to the 10 kHz range, but the high harmonics of the cymbals are much
too loud (bright). By combining a PEQ HF boost at 10 kHz with an HF cut at 20 kHz you can obtain the effect
of a gentle shelving boost with the HF rolloff you need (pictured below). Or in mixing, this type of filter shape
helps you to strongly accent individual elements of a mix, while also clearing away room for similar instruments
in a busy mix. The possibilities of the PEQ are only limited by your imagination! Notice in the graph below
that adding in attenuation may boost the overall level slightly; this is just a consequence of normal impedance
interaction in any analog filter so it pays to use your ears.
PEQ, HF boost of 8 @ 10 kHz (blue); combined with an HF cut of 8 @ 20 kHz (red)
Always use your ears! Listen, and not just look at the numbers. If something sounds good… it IS good.