1. Fader Controls – The faders are marked CHANNEL 1 thru CHANNEL 4 which correspond to the mic XLR inputs also marked CHANNEL 1 thru CHANNEL 4. These channel faders control the post preamp gain.
2. Master Fader – The master fader marked MASTER controls the gain of all four channels and has a detent at the 0db reference position (normal operating position).
3. Battery Test – The push button switch marked BATT allows a battery voltage test which is indicated on the right VU meter. A set of new batteries will indicate up to and including the 0db position on the meter.
4. VU Meter Illumination – The VU meter illumination is controlled by a momentary push button switch called LAMP. The meters will be illuminated for approximately 12 seconds and then return to off.
5. Low Cut Filters – The switches marked 140 20 100 insert a 12db per octave hi pass filter in each channel as follows: the 20 position is a flat response to 20HZ, and the 100 and 140 positions roll off at 100HZ and 140HZ.
6. Reference Tone – The TONE button when pushed IN (push on/push off switch) enables a 400HZ reference tone oscillator which provides a 0db VU reference tone to the right and left line outputs. The push button OUT position disables the tone.
7. Slate Mic – The push button switch marked MIC when pushed in, enables the slate function to be outputted to the left and right line outputs.
8. Power Monitor – The LED marked BATT slowly flashes on and off under normal power voltage conditions and turns to a continuous ON when external power or battery voltages are dangerously low.
9. HP Monitor Control – The switch marked L STEREO R allows the operator to switch the headphones to left ear, or stereo (normal position).
10. Meters – The two meters, right and left, are calibrated in VU (PPM optional, BBC std.).
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