Class-A Vacuum Tube Preamp with High Voltage Gain
High-Visibility Vintage VU Meter
Compressor designed from the dbx162SL
3-Band Semi-Parametric EQ
1/4” and XLR Inputs and Outputs
Front Panel Instrument Input
Side Chain Insert
Optional Digital Output Card
Specifications
Mic Preamp Connector : Female XLR Pin 2 Hot; Electronically balanced/unbalanced
Mic Preamp Input Impedance : 1.9 kΩ
CMRR : >85 dB from 20 Hz to 3 kHz, >70 dB from 3 kHz to 20 kHz
Instrument Input Connector : Tip-Sleeve ¼” Jack
Input Type : (instrument) Unbalanced
Instrument Input Impedance : 500 k Ω
Max Input : (instrument) +21dBu unbalanced
Preamp Insert Connector : Tip-Ring-Sleeve ¼”, RF filtered
Preamp Insert Type :Unbalanced, Tip = send, Ring = return
Line Outputs (Preamp & Compressor/Limiter) Connector : Male XLR and Tip-Ring-Sleeve ¼” (Pin 2 and Tip hot)
Line Outputs (Preamp & Compressor/Limiter) Type : Servo-balanced/unbalanced
Line Outputs (Preamp & Compressor/Limiter) Impedance : Balanced 30 Ω, unbalanced 15 Ω
Line Outputs (Preamp & Compressor/Limiter) Maximum Output Level : > +21 dBm (into a 600 ohm load)
Compressor Sidechain Insert Connector : Tip-Ring-Sleeve ¼”, RF filtered
Compressor Sidechain Insert Type : Unbalanced, Ring = output, Tip = input
Compressor Sidechain Insert Impedance : 1 kΩ (output), 50 kΩ (input)
Vacuum Tube Type : 12AU7A / ECC82
Vacuum Tube Grid Power Supply : +250V DC
Vacuum Tube Heater Power Supply : +12V DC
Frequency Response (Mic Input) : 20 Hz to 50 kHz, +0/-1dB, 40 dB gain
Frequency Response (Instrument Input) : 30 Hz to 70 kHz, +0/-1dB, unity gain
THD + Noise (Mic In to LIne Out) : 0.25% typical at 0 dBu out, 1 kHz, 40 dB gain
THD + Noise (Instrument In to Line Out) : 0.2% typical at 0 dBu out, 1kHz, unity gain
Equivalent Noise Level : Typically > -123 dBu with a 150 Ω source load, 22 Hz to 22 kHz
Noise Floor : Mic Insert to Comp Output: <-93 dBu, unity gain, EQ flat and no gain reduction
Preamp Function Switches/Controls: Instrument Input : Selects between microphone XLR input and front panel ¼” instrument input
Preamp Function Switches/Controls : +48V Sends +48 VDC through 6.81 kΩ resistors to pins 2 and 3 of the microphone input
Preamp Function Switches/Controls : 20dB Pad Attenuates the microphone input by 20 dB
Preamp Function Switches/Controls Polarity Invert : Reverses pins 2 and 3 of the microphone input XLR
Preamp Function Switches/Controls 80 Hz Low Cut : Enables an 80 Hz, 12 dB/octave high pass filter in the microphone and instrument signal path
Preamp Function Switches/Controls Gain Control Range : -∞ to +55 dB for Microphone Input; -∞ to +40 dB for Instrument Input
Preamp Function Switches/Controls Post Tube Attenuation : -∞ to 0 dB
Preamp Function Switches/Controls Peak Indicator : Illuminates RED when the Preamp is within 3 dB of clipping
EQ Low Frequency : 100 Hz, Low-pass shelving filter
EQ High Frequency : 10 kHz, High-pass shelving filter
EQ Mid Frequency : Sweepable from 100 Hz to 8 kHz
EQ Function Switches/Controls: Narrow : Selects the “Q” of the MID Frequency EQ. “OUT” position Q = 0.9; “IN” position Q = 2.9
EQ Gain : (All Bands) Sweepable from –15 to +15 dB
Compressor Threshold Range : -40 dBu to +20 dBu
Compressor Threshold Characteristic : Selectable OverEasy™ or Hard Knee
Compressor Ratio : Variable 1:1 to ∞:1; 60 dB maximum Compression
Compressor Attack/Release Modes : Selectable Manual or Auto
Compressor Manual Attack Time : Scalable program-dependent; Typically 400 dB/msec to 1 dB/msec
Compressor Manual Release Time : Scalable program-dependent; Typically 4000 dB/sec to 10 dB/sec
Compressor Auto Attack Time : Program-dependent, typically 15 ms for 10 dB, 5 ms for 20 dB, 3 ms for 30 dB
Compressor Auto Release Time : Program-dependent, typically 120 dB/sec
Compressor Output Level Control Range : -20 dB to +20 dB
Compressor Peak Indicator : Illuminates RED when the Compressor/Limiter is within 3 dB of clipping
Limiter Type : dbx PeakPlus
Limiter Threshold Range : -4 dBu to + 22 dBu (off)
Limiter Ratio : ∞:1
Limiter Attack and Release : Program-dependent
Power Supply : Universal switch-mode
Operating Voltage : 100 – 240 VAC, 50/60 Hz
Power Requirements : 20 Watts
Fuse : T2.5AL 250V
Turn-On Time : Approximately 2 seconds
Dimensions : 3.5”H X 19”W X 8”D (88.9mmH X 482.6mmW X 203.2mmD)
Weight : 8.1 lbs (3.7 kg)
Shipping Weight : 11.0 lbs (5.0 kg)