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Mic Preamp Connector
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Female XLR Pin 2 Hot; Electronically balanced/unbalanced
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Mic Preamp Input Impedance
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1.9 kΩ
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CMRR
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>85 dB from 20 Hz to 3 kHz, >70 dB from 3 kHz to 20 kHz
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Instrument Input Connector
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Tip-Sleeve ¼” Jack
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Input Type
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(instrument) Unbalanced
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Instrument Input Impedance
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500 k Ω
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Max Input
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(instrument) +21dBu unbalanced
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Preamp Insert Connector
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Tip-Ring-Sleeve ¼”, RF filtered
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Preamp Insert Type
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Unbalanced, Tip = send, Ring = return
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Line Outputs (Preamp & Compressor/Limiter) Connector
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Male XLR and Tip-Ring-Sleeve ¼” (Pin 2 and Tip hot)
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Line Outputs (Preamp & Compressor/Limiter) Type
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Servo-balanced/unbalanced
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Line Outputs (Preamp & Compressor/Limiter) Impedance
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Balanced 30 Ω, unbalanced 15 Ω
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Line Outputs (Preamp & Compressor/Limiter) Maximum Output Level
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> +21 dBm (into a 600 ohm load)
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Compressor Sidechain Insert Connector
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Tip-Ring-Sleeve ¼”, RF filtered
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Compressor Sidechain Insert Type
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Unbalanced, Ring = output, Tip = input
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Compressor Sidechain Insert Impedance
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1 kΩ (output), 50 kΩ (input)
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Vacuum Tube Type
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12AU7A / ECC82
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Vacuum Tube Grid Power Supply
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+250V DC
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Vacuum Tube Heater Power Supply
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+12V DC
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Frequency Response (Mic Input)
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20 Hz to 50 kHz, +0/-1dB, 40 dB gain
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Frequency Response (Instrument Input)
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30 Hz to 70 kHz, +0/-1dB, unity gain
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THD + Noise (Mic In to LIne Out)
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0.25% typical at 0 dBu out, 1 kHz, 40 dB gain
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THD + Noise (Instrument In to Line Out)
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0.2% typical at 0 dBu out, 1kHz, unity gain
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Equivalent Noise Level
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Typically > -123 dBu with a 150 Ω source load, 22 Hz to 22 kHz
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Noise Floor
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Mic Insert to Comp Output: <-93 dBu, unity gain, EQ flat and no gain reduction
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Preamp Function Switches/Controls: Instrument Input
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Selects between microphone XLR input and front panel ¼” instrument input
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Preamp Function Switches/Controls: +48V
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Sends +48 VDC through 6.81 kΩ resistors to pins 2 and 3 of the microphone input
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Preamp Function Switches/Controls: 20dB Pad
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Attenuates the microphone input by 20 dB
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Preamp Function Switches/Controls: Polarity Invert
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Reverses pins 2 and 3 of the microphone input XLR
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Preamp Function Switches/Controls: 80 Hz Low Cut
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Enables an 80 Hz, 12 dB/octave high pass filter in the microphone and instrument signal path
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Preamp Function Switches/Controls: Gain Control Range
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-∞ to +55 dB for Microphone Input; -∞ to +40 dB for Instrument Input
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Preamp Function Switches/Controls: Post Tube Attenuation
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-∞ to 0 dB
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Preamp Function Switches/Controls: Peak Indicator
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Illuminates RED when the Preamp is within 3 dB of clipping
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EQ Low Frequency
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100 Hz, Low-pass shelving filter
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EQ High Frequency
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10 kHz, High-pass shelving filter
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EQ Mid Frequency
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Sweepable from 100 Hz to 8 kHz
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EQ Function Switches/Controls: Narrow
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Selects the “Q” of the MID Frequency EQ. “OUT” position Q = 0.9; “IN” position Q = 2.9
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EQ Gain
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(All Bands) Sweepable from –15 to +15 dB
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Compressor Threshold Range
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-40 dBu to +20 dBu
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Compressor Threshold Characteristic
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Selectable OverEasy™ or Hard Knee
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Compressor Ratio
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Variable 1:1 to ∞:1; 60 dB maximum Compression
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Compressor Attack/Release Modes
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Selectable Manual or Auto
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Compressor Manual Attack Time
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Scalable program-dependent; Typically 400 dB/msec to 1 dB/msec
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Compressor Manual Release Time
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Scalable program-dependent; Typically 4000 dB/sec to 10 dB/sec
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Compressor Auto Attack Time
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Program-dependent, typically 15 ms for 10 dB, 5 ms for 20 dB, 3 ms for 30 dB
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Compressor Auto Release Time
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Program-dependent, typically 120 dB/sec
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Compressor Output Level Control Range
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-20 dB to +20 dB
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Compressor Peak Indicator
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Illuminates RED when the Compressor/Limiter is within 3 dB of clipping
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Limiter Type
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dbx PeakPlus™
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Limiter Threshold Range
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-4 dBu to + 22 dBu (off)
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Limiter Ratio
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∞:1
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Limiter Attack and Release
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Program-dependent
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Power Supply
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Universal switch-mode
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Operating Voltage
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100 – 240 VAC, 50/60 Hz
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Power Requirements
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20 Watts
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Fuse
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T2.5AL 250V
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Turn-On Time
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Approximately 2 seconds
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Dimensions
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3.5”H X 19”W X 8”D (88.9mmH X 482.6mmW X 203.2mmD)
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Weight
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8.1 lbs (3.7 kg)
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Shipping Weight
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11.0 lbs (5.0 kg)
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