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Mic Preamp

Equivalent Input Noise (20Hz-20kHz)

 150 ohm

-129.5 dBu

   50 ohm

-131.0 dBu

 0 ohm

-134.5 dBu

Frequency Response


5Hz to 100kHz:


3Hz to 192kHz:

IM Distortion (4 to 1 ratio SMPTE)
 35dB gain


Harmonic Distortion (20Hz-20kHz)
 35dB gain


 Max +60dB
 Min 0dB or Unity
Max Input +22dB
Input Impedance 1.3k Ohm
Common Mode Rejection > 90dB
Common Mode Rejection Ratio > 140dB
Main Mix Noise
20Hz-20kHz bandwidth, 1/4" Main out, channels 1-4 Trim @ unity gain, channel EQs flat, all channels assigned to Main Mix, channels 1 and 3 Pan left, 2 and 4 Pan right, Reference +4dBu
Main Mix knob fully counterclockwise, channel Gain knobs down:


Main Mix knob unity, channel Gain knobs down:


(90dB Signal to Noise Ratio, ref +4dBu)Main Mix knob @ unity, channel Gain knobs @ unity:


Total Harmonic Distortion (THD)
1kHz @ +14dBu, 20Hz-20kHz.
Mic in to Main out:


Attenuation (Crosstalk)
1kHz relative to 0dBu, 20Hz-20kHz bandwidth, Line in, 1/4" Main Out, Trim @ unity
Main Mix knob down:


Channel Mute/Alt 3/4 switch engaged:


Channel Gain knob down:


Frequency Response
Any input to any output

20kHz to 60kHz


20kHz to 100kHz

Maximum Levels
Mic in:


Tape in:


All other inputs:


Main Mix XLR out:


All other outputs:


Mic in:

1.3 kilohms

Channel Insert return:

2.5 kilohms

All other inputs:

10 kilohms or greater

Tape out:

1.1 kilohms

All other outputs:

120 ohms

High Shelving

±15db @12kHz

Mid Peaking

±12dB @ 2.5kHz

Low Shelving

±15db @ 80Hz

Power Consumption:

120VAC, 50/60Hz, 25 watts


6 lbs 8 oz. (3 kg)

Since we're always striving to make our stuff better by incorporating new and improved materials, components and manufacturing methods, we reserve the right to change these specifications at any time without notice.

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