Microphone Preamp EIN −126 dBu at maximum gain with a 150 Ω source.
Microphone Input Minimum impedance 2 kΩ; balanced XLR connection, pin 1 ground, pin 2 (+), pin 3 (−). At maximum gain (59 dB), input levels are −71 dBu minimum, −51 dBu nominal, and −39 dBu maximum. At minimum gain (4 dB), input levels are −17 dBu minimum, +5 dBu nominal, and +16 dBu maximum.
Line Input Minimum impedance 10 kΩ; balanced 1/4" TRS connection, tip (+), ring (−), sleeve ground. At maximum gain (40 dB), input levels are −52 dBu minimum, −32 dBu nominal, and −20 dBu maximum. At minimum gain (−15 dB), input levels are +2 dBu minimum, +23 dBu nominal, and greater than +32 dBu maximum.
Guitar Input Impedance 1 MΩ with Guitar Shape engaged on channel 8, described as like a 12AX7 vacuum tube guitar amplifier input.
3.5 mm / RCA Input Minimum impedance 2.8 kΩ; unbalanced connection. At maximum gain (18 dB), input levels are −43 dBu minimum, −23 dBV nominal, and −10 dBu maximum. At nominal gain, input levels are −24 dBu minimum, −5 dBu nominal, and +8 dBu maximum. The 3.5 mm connection uses tip left, ring right, and sleeve ground; RCA uses tip (+) and sleeve ground.
Main Left/Right Outputs Minimum load impedance 600 Ω; +4 dBu nominal output and +20 dBu maximum output; balanced XLR and 1/4" TRS connections. XLR uses pin 2 (+) and pin 3 (−); TRS uses tip (+), ring (−), and sleeve ground.
Effects and Monitor Sends Minimum load impedance 600 Ω; +4 dBu nominal output and +20 dBu maximum output; balanced 1/4" TRS connection, tip (+), ring (−), sleeve ground.
Control Room Output Minimum load impedance 600 Ω; +4 dBu nominal output and +20 dBu maximum output; unbalanced RCA connection, tip (+), sleeve ground.
Headphone Output Minimum load impedance 8 Ω; +4 dBu nominal output with no load and +20 dBu maximum output; unbalanced 1/4" TRS connection, tip left, ring right, sleeve ground.
Microphone Input Gain Adjustment Range 4 dB to 59 dB.
Microphone Input to Left/Right Output Gain 79 dB maximum gain.
Line Input Gain Adjustment Range −16 dB to 40 dB.
Line Input to Left/Right Output Gain 60 dB maximum gain.
Frequency Response at Maximum Input Gain Microphone input to left/right output, 14 Hz to 25 kHz, +0 dB/−1 dB.
Frequency Response at 12:00 Input Gain Microphone input to left/right output, 9.5 Hz to 29 kHz, +0 dB/−0.8 dB.
Total Harmonic Distortion Less than 0.006% typical, microphone input to left/right output, measured over a 22 Hz to 22 kHz bandwidth.
Master Left/Right Noise with Faders Down −97 dBu residual noise; 101 dB signal-to-noise ratio referenced to +4 dBu; master fader down and channel levels down.
Master Left/Right Noise with Master Fader Nominal −90 dBu residual noise; 94 dB signal-to-noise ratio referenced to +4 dBu; master fader nominal and channel levels down.
Master Left/Right Noise with Channel Faders Nominal −83 dBu residual noise; 87 dB signal-to-noise ratio referenced to +4 dBu; master fader nominal, channel faders nominal, odd channels panned left, and even channels panned right.
Monitor Send Noise with Controls Off −95 dBu residual noise; 99 dB signal-to-noise ratio referenced to +4 dBu; all controls off.
Monitor Send Noise with Sends Nominal −80 dBu residual noise; 84 dB signal-to-noise ratio referenced to +4 dBu; all channel sends nominal and masters nominal.
Hum and Noise Measurement Bandwidth 22 Hz to 22 kHz.
Equivalent Input Noise −128 dBu with the input terminated with 150 Ω, measured over a 20 kHz bandwidth.
Adjacent Input Channel Crosstalk Greater than 90 dB at 1 kHz.
Left-to-Right Output Crosstalk Greater than 70 dB at 1 kHz.
Mute Button Attenuation Greater than 90 dB at 1 kHz.
Channel Fader Kill Greater than 85 dB at 1 kHz.
Microphone Input Common Mode Rejection Ratio 50 dB minimum from 20 Hz to 20 kHz; 70 dB typical at 1 kHz.
Meters 12-segment, peak-reading meters; top green LED represents +4 dBu.
Signal/Overload Indicators Red LED lights 5 dB below clipping.
Dimensions 16.1875" W × 17.3" D × 2.1875" H (41.12 cm W × 43.94 cm D × 5.56 cm H).
Weight 12.12 lb (5.50 kg).
Power Requirements 100–240 VAC, 50/60 Hz, 24 W.
Level Reference 0 dBu = 0.775 V RMS.
Minimum Input Level Definition The smallest signal that produces nominal output (+4 dBu) with channel and master faders set for maximum gain.
Nominal Settings Definition All controls set at 0 dB, or 50% rotation for rotary controls, except the gain adjustment control, which is set as specified.
