Mic Preamp ConnectorFemale XLR Pin 2 Hot; Electronically balanced/unbalanced Mic Preamp Input Impedance1.9 kΩ CMRR>85 dB from 20 Hz to 3 kHz, >70 dB from 3 kHz to 20 kHzInstrument Input ConnectorTip-Sleeve ¼” JackInput Type(instrument) Unbalanced Instrument Input Impedance500 k ΩMax Input(instrument) +21dBu unbalanced Preamp Insert ConnectorTip-Ring-Sleeve ¼”, RF filteredPreamp Insert TypeUnbalanced, Tip = send, Ring = returnLine Outputs (Preamp & Compressor/Limiter) ConnectorMale XLR and Tip-Ring-Sleeve ¼” (Pin 2 and Tip hot)Line Outputs (Preamp & Compressor/Limiter) TypeServo-balanced/unbalancedLine Outputs (Preamp & Compressor/Limiter) ImpedanceBalanced 30 Ω, unbalanced 15 ΩLine Outputs (Preamp & Compressor/Limiter) Maximum Output Level> +21 dBm (into a 600 ohm load)Compressor Sidechain Insert ConnectorTip-Ring-Sleeve ¼”, RF filteredCompressor Sidechain Insert TypeUnbalanced, Ring = output, Tip = inputCompressor Sidechain Insert Impedance1 kΩ (output), 50 kΩ (input)Vacuum Tube Type12AU7A / ECC82Vacuum Tube Grid Power Supply+250V DCVacuum Tube Heater Power Supply+12V DCFrequency Response (Mic Input)20 Hz to 50 kHz, +0/-1dB, 40 dB gainFrequency Response (Instrument Input)30 Hz to 70 kHz, +0/-1dB, unity gainTHD + Noise (Mic In to LIne Out) 0.25% typical at 0 dBu out, 1 kHz, 40 dB gainTHD + Noise (Instrument In to Line Out)0.2% typical at 0 dBu out, 1kHz, unity gainEquivalent Noise Level Typically > -123 dBu with a 150 Ω source load, 22 Hz to 22 kHzNoise FloorMic Insert to Comp Output: <-93 dBu, unity gain, EQ flat and no gain reductionPreamp Function Switches/Controls: Instrument InputSelects between microphone XLR input and front panel ¼” instrument inputPreamp Function Switches/Controls: +48VSends +48 VDC through 6.81 kΩ resistors to pins 2 and 3 of the microphone inputPreamp Function Switches/Controls: 20dB PadAttenuates the microphone input by 20 dBPreamp Function Switches/Controls: Polarity InvertReverses pins 2 and 3 of the microphone input XLRPreamp Function Switches/Controls: 80 Hz Low CutEnables an 80 Hz, 12 dB/octave high pass filter in the microphone and instrument signal pathPreamp Function Switches/Controls: Gain Control Range-∞ to +55 dB for Microphone Input; -∞ to +40 dB for Instrument InputPreamp Function Switches/Controls: Post Tube Attenuation-∞ to 0 dBPreamp Function Switches/Controls: Peak IndicatorIlluminates RED when the Preamp is within 3 dB of clippingEQ Low Frequency100 Hz, Low-pass shelving filterEQ High Frequency10 kHz, High-pass shelving filterEQ Mid FrequencySweepable from 100 Hz to 8 kHzEQ Function Switches/Controls: NarrowSelects the “Q” of the MID Frequency EQ. “OUT” position Q = 0.9; “IN” position Q = 2.9EQ Gain(All Bands) Sweepable from –15 to +15 dBCompressor Threshold Range-40 dBu to +20 dBuCompressor Threshold CharacteristicSelectable OverEasy™ or Hard KneeCompressor RatioVariable 1:1 to ∞:1; 60 dB maximum CompressionCompressor Attack/Release ModesSelectable Manual or AutoCompressor Manual Attack TimeScalable program-dependent; Typically 400 dB/msec to 1 dB/msecCompressor Manual Release TimeScalable program-dependent; Typically 4000 dB/sec to 10 dB/secCompressor Auto Attack TimeProgram-dependent, typically 15 ms for 10 dB, 5 ms for 20 dB, 3 ms for 30 dBCompressor Auto Release TimeProgram-dependent, typically 120 dB/secCompressor Output Level Control Range-20 dB to +20 dBCompressor Peak IndicatorIlluminates RED when the Compressor/Limiter is within 3 dB of clippingLimiter Typedbx PeakPlus™Limiter Threshold Range-4 dBu to + 22 dBu (off)Limiter Ratio∞:1Limiter Attack and ReleaseProgram-dependentPower SupplyUniversal switch-modeOperating Voltage100 – 240 VAC, 50/60 HzPower Requirements20 WattsFuseT2.5AL 250VTurn-On TimeApproximately 2 secondsDimensions3.5”H X 19”W X 8”D (88.9mmH X 482.6mmW X 203.2mmD)Weight8.1 lbs (3.7 kg)Shipping Weight11.0 lbs (5.0 kg)