Specifications

Frequency Response
10 Hz - 65 kHz +0/-1 dB (any input to any output at nominal operating levels)
-3dB Point: 125 kHz

Connectors
MIC IN jacks: Female XLR (Pin 1 ground, Pin 2 +, Pin 3 -)
LINE IN jacks: Female 1/4 in. 3-conductor phone (Tip = +, ring = -, sleeve = ground)
INSERT jacks: Female 1/4 in. 3-conductor phone (Tip = send, ring = return, sleeve = ground)
Inserting plug to first 'click' allows direct output without breaking normal signal flow
STEREO LINE IN and STEREO AUX RETURN jacks: Female 1/4 in. 3-conductor x 2
MAIN OUT BALANCED, MONITOR OUT, and AUX SEND jacks: Female 1/4 in. 3-conductor phone (Tip = +, ring = -, sleeve = ground)
MAIN OUT -10 dBV jacks: Female phono (RCA) jacks
TAPE IN jacks: Female phono (RCA) jacks

Levels
MIC IN: -60 dBu to -10 dBu nominal, maximum level +12 dBu
LINE IN: -40 dBu to +10 dBu nominal, maximum level +32 dBu (balanced)
STEREO LINE IN: -15 dBu to +15 dBu nominal, maximum input level +22 dBu
MAXIMUM GAIN:
+76 dB, MIC IN to MAIN OUT, balanced
+80 dB, MIC IN to MONITOR OUT, balanced or unbalanced
CHANNEL PEAK LED ON: 6 dB below channel clipping
METER: Peak type
-24 dB to PK (+18 dB over reference at MAIN OUT, 6 dB before output clipping)
MAIN OUT LEVEL (1/4 in. phone jacks) (when meter is at 0 VU):
+4 dBu (1.24 volts) into a balanced load
-2 dBu into an unbalanced load
MAIN OUT LEVEL (phono jacks): -10 dBV (.316 volts) unbalanced
MAXIMUM OUTPUT LEVEL: +22 dBu unbalanced, +28 dBu balanced (6 dB above 'PK' segment of main meter)
MONITOR OUT LEVEL: Same as above, but variable following MONITOR/PHONES control
INSERT/DIRECT OUT (tip): Unity gain
INSERT IN (ring)l Maximum level +22 dBu
HEADROOM: 23.5 dB above nominal output

Impedance
MIC IN: 50-150 Ohms nominal source impedance (presents 4 kOhms balanced load impedance)
LINE IN: 600 Ohms-2 kOhms nominal (>20 k Ohms load impedance)
OUTPUTS (MAIN, AUX and MON): 150 Ohms unbalanced, 300 Ohms balanced
1.1 k Ohms at -10dBV MAIN OUTS

Noise performance (typical)
Measured at MAIN OUT +4 dBu jacks, unbalanced load, 22 Hz to 22 kHz, all channels panned to center.
MIC IN to INSERT OUT: -128.5 dBu Equivalent Input Noise at maximum gain
Residual output noise (MASTER fader at nominal, channel faders at minimum): < -88 dBu
12 inputs, faders and trims at unity gain, inputs terminated 150 Ohms: < -85 dBu unbalanced (+22 dB max unbalanced out = 107 dB dynamic range)

Distortion (THD+N)
Measured with a 0 dBu signal coming into a MIC IN jack with trim set for a +15 dBu output from the insert jack.
At INSERT jack: Better than 0.0010%
At MAIN OUT (+21 dBu balanced output level): Better than 0.0015%

Power
U.S.A. model: 120 VAC, 60 Hz, 40 watts power consumption maximum

Mounting
19 in. EIA rack mountable, 3 spaces