DBX 676 Tube Microphone Preamp Channel Strip

○ Mic Preamp Connector: Female XLR, Pin 2 Hot, electronically balanced/unbalanced

○ Mic Preamp Input Impedance: 1.9 kΩ

○ Common Mode Rejection Ratio (CMRR): >85 dB (20 Hz to 3 kHz), >70 dB (3 kHz to 20 kHz)

○ Instrument Input Connector: Tip-Sleeve ¼” Jack (unbalanced)

○ Instrument Input Impedance: 500 kΩ

○ Maximum Instrument Input: +21 dBu (unbalanced)

○ Preamp Insert Connector: Tip-Ring-Sleeve ¼”, RF filtered (unbalanced)

○ Line Outputs (Preamp & Compressor/Limiter): Male XLR and Tip-Ring-Sleeve ¼” (balanced/unbalanced)

○ Output Impedance: Balanced 30 Ω, unbalanced 15 Ω

○ Maximum Output Level: > +21 dBm (into 600 Ω load)

○ Compressor Sidechain Insert Connector: Tip-Ring-Sleeve ¼”, RF filtered

○ Vacuum Tube: 12AU7A / ECC82, +250 V DC grid power, +12 V DC heater power

○ Frequency Response (Mic Input): 20 Hz to 50 kHz, +0/-1 dB at 40 dB gain

○ Frequency Response (Instrument Input): 30 Hz to 70 kHz, +0/-1 dB at 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, 1 kHz, unity gain

○ Equivalent Noise Level: Typically > -123 dBu with 150 Ω source load, 22 Hz to 22 kHz

○ Noise Floor: Mic Insert to Compressor Output: < -93 dBu, unity gain, EQ flat, no gain reduction

○ Compressor Threshold Range: -40 dBu to +20 dBu

○ Threshold Characteristic: Selectable OverEasy™ or Hard Knee

○ Compressor Ratio: Variable from 1:1 to infinity:1, with max 60 dB compression

○ Attack/Release Modes: Selectable manual or auto

○ Manual Attack Time: Scalable, typically 400 dB/msec to 1 dB/msec

○ Manual Release Time: Scalable, typically 4000 dB/sec to 10 dB/sec

○ Auto Attack Time: Program-dependent, typically 15 ms for 10 dB compression, faster with higher compression

○ Auto Release Time: Program-dependent, typically 120 dB/sec

○ Output Level Control Range: -20 dB to +20 dB

○ Peak Indicator: LED illuminates red within 3 dB of clipping

○ Limiter Type: dbx PeakPlus™ program-dependent attack/release

○ Limiter Threshold Range: -4 dBu to +22 dBu (off)

○ Limiter Ratio: Infinity:1

○ Low Frequency: 100 Hz shelving filter

○ Mid Frequency: Sweepable 100 Hz to 8 kHz with selectable Q (0.9 or 2.9)

○ High Frequency: 10 kHz shelving filter

○ Gain Range: ±15 dB on all bands

○ Front Panel Instrument Input: Select between microphone XLR input and front ¼” instrument input

○ Phantom Power: +48V switch through 6.81 kΩ resistors

○ Pad: 20 dB pad attenuates microphone input

○ Polarity Invert: Reverses pins 2 and 3 of the microphone input XLR

○ Low Cut Filter: 80 Hz high-pass filter at 12 dB/octave slope

○ Gain Control Range: Microphone Input: -∞ to +55 dB; Instrument Input: -∞ to +40 dB

○ Peak Indicators: LED warning for preamp and compressor clipping within 3 dB

○ Operating Voltage: 100 – 240 VAC, 50/60 Hz

○ Power Consumption: 20 Watts

○ Dimensions: 3.5”H x 19”W x 8”D (88.9 mm x 482.6 mm x 203.2 mm)

○ Weight: 8.1 lbs (3.7 kg)