33115 EQ/Mic Pre Specifications:

Controls
Sensitivity Switch
Two balanced inputs as follows:

Microphone input: Sensitivity adjustable In 5 dB steps between -80 and -10 dB for 0 dB output. Input

impedance 1200 ohms.

Line input: Sensitivity adjustable in 5 d8 steps between -20 dB and +15 dl~ for 0 dB output. Input impedance 10000 ohms.

Treble Control – Shelving
Variable to a maximum of ±20 ±1.5 dB.

Presence Control – Peaking

Variable to a maximum of ±18 ±1.5 dB. Switched boost and cut frequencies peaking at 8K2, 3K9, lKR, 820, 390 hertz.

Bass Control – Shelving

Variable to a maximum of ± 20 dB.  Switched boost and cut frequencies peaking at 8K2, 3K9, 820, 390 Hertz

High, Pass Filter

Five switched frequencies with ± 3dB points at 27, 47, 82, 150 and 270 Hertz all ±10dB

EQ in/out
Phase reversal (balanced output only).