Ingram Engineering EQ52 Low Cut High Cut See-Saw Filter

Low Cut Filter: 50 Hz to 5 kHz in two ranges, continuously adjustable
See-Saw Filter: simultaneous bass boost / treble cut and vise versa
See-Saw pivot frequency switchable from 120 Hz to 26 kHz in two ranges
8 dB max See-Saw cut / boost
High Cut Filter: 3 kHz to >200 kHz continuously adjustable
Low and high cut filters use gentle and musical -6 dB / octave
Balanced input and output
Unity gain, with output driving either balanced or unbalanced
Input impedance: 48k Ohms differential
Output impedance: 100 Ohms differential
Max input level: +20 dBu
THD: 0.002 % Typ at +20 dBu
CMRR: 90 dB Typ at 60 Hz
Noise: -96 dBu

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