The DBX 676 is a tube mic pre channel strip for audio professionals, perfect for recording or live applications. From the Manufacturer: At dbx Professional Products we are proud to introduce the all new 676 Tube Mic Pre Channel Strip. The 676 represents all of the best of dbx’s more than 40 years of dynamics processing. The 676 offers a pristine high-voltage, Class-A tube preamp section that runs on 250 volts, so your signal can be as crystal clean or dirty as you need it to be. The 676 also incorporates the compressor/limiter design from the highly-sought after dbx162SL, as well as a 3-band parametric EQ with sweepable mids. The 676 provides audio professionals with the perfect channel strip for recording and live applications alike with its military-grade build, vintage-inspired controls and VU metering. Features: 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 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: