DBX 676 Tube Microphone Preamp Channel Strip
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dbx 676 Tube Microphone Preamp Channel Strip
The dbx 676 is a professional-grade channel strip designed for audio engineers seeking pristine sound quality and versatile control. Featuring a high-voltage, Class-A tube preamp section running on 250 volts, it delivers signals ranging from crystal clear to warm and colored tube tones. Incorporating the compressor/limiter design from the renowned dbx162SL and a 3-band parametric EQ with sweepable mids, the 676 offers comprehensive tonal shaping and dynamic control.
Built with a military-grade chassis, vintage-inspired controls, and high-visibility VU metering, the 676 is ideal for both studio recording and live sound applications. Its front-panel instrument input, side-chain insert, and separate preamp and compressor outputs provide professional flexibility for advanced routing and parallel processing.
Key Features
- Class-A Tube Preamp: High-voltage 250V Class-A vacuum tube preamp section for pristine or warm tonal coloration.
- Compressor/Limiter: Derived from dbx162SL with PeakPlus™ limiting to prevent clipping and smooth dynamics control.
- 3-Band Parametric EQ: Sweepable mids (100 Hz to 8 kHz) with selectable Q (0.9 or 2.9), plus low (100 Hz) and high (10 kHz) shelving filters.
- Flexible Connectivity: Balanced XLR and ¼-inch inputs and outputs with a front-panel instrument input for direct instrument connection.
- Side-Chain Insert: ¼-inch jack for external signal processing, enabling advanced compression techniques like de-essing.
- Vintage-Inspired Controls: Classic knobs and switches paired with high-visibility VU metering for intuitive level and gain reduction monitoring.
- Robust Build: Military-grade chassis designed for reliability in studio and live performance environments.
Specifications
• General
○ 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 & Noise
○ 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 / Limiter
○ 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
• EQ
○ 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
• Controls and Features
○ 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
• General Information
○ 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)
Package Content
- dbx 676 Tube Microphone Preamp Channel Strip unit
- Power cable
- User manual
