... 18dB/octave Bessel high-pass filter Range (recessed): Selects either +/- 6dB or +/-15dB slider boost/cut range Dimensions: 5.25" H X ... >50kHz, +0.5/-3dB Noise Reduction In: (+/-6 and +/-12dB range): Signal-to-Noise: >102dB, unweighted, ref: +4dBu, 22kHz measurement ... to-Noise: >90dB, unweighted, ref: +4dBu, 22kHz measurement bandwidth Dynamic Range: >108dB, unweighted THD + Noise: <0.04%, 0.02% typical ...