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DBX 676 Tube Microphone Preamp Channel Strip - DBX676FX

$1,612.11 $1,299.00

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DBX | SKU: DBX676FX

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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

Specs

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)

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