676 Tube Microphone Preamp Channel Strip

SKU: # 451935   |   Model: # 676-DBX   |    Product Reviews0 Reviews  Write a Review

676 Tube Microphone Preamp Channel Strip

Additional Photos:

676 Tube Microphone Preamp Channel Strip
676 Tube Microphone Preamp Channel Strip
Your Price: $1,809.99 CDN
or from $106 CDN/mo

Buy Online

 Add to Cart

Buy In-Store

The dbx 676 provides audio professionals with the perfect channel strip for recording and live applications alike with its military-grade build and vintage-inspired controls, VU metering and state-of-the-art optional digital output card. 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.


• 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


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 Jack
Input Type: (instrument) Unbalanced
Instrument Input Impedance: 500 k Ω
Max Input: (instrument) +21dBu unbalanced
Preamp Insert Connector: Tip-Ring-Sleeve , RF filtered
Preamp Insert Type: Unbalanced, Tip = send, Ring = return
Line Outputs (Preamp & Compressor/Limiter) Connector: Male XLR and Tip-Ring-Sleeve (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 , 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 InputSelects between microphone XLR input and front panel 1/4" instrument input
Preamp Function Switches/Controls: +48VSends +48 VDC through 6.81 kΩ resistors to pins 2 and 3 of the microphone input
Preamp Function Switches/Controls: 20dB PadAttenuates the microphone input by 20 dB
Preamp Function Switches/Controls: Polarity InvertReverses pins 2 and 3 of the microphone input XLR
Preamp Function Switches/Controls: 80 Hz Low CutEnables 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 IndicatorIlluminates 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: NarrowSelects 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 (H x W x D): 3.5" X 19" X 8" (88.9mm X 482.6mm X 203.2mm)
Weight8.1 lbs (3.7 kg)

Q & A

There are currently no questions for this product.


There are currently no reviews for this product. Be the first to write one!

Performance Warranty Banner

Protect your investment with the Long & McQuade Performance Warranty

A warranty can be a very important factor when making a buying decision. Because repairs can be very expensive in terms of parts and labour costs, manufacturers usually only provide one year limited warranties that generally only cover items that malfunction due to a manufacturer’s defect. With an important purchase such as a musical
instrument or piece of studio gear, however, many people want to have the peace of mind in knowing that their investment will be protected should the product no longer be performing at 100%.

Because of this, Long & McQuade provides our customers with a FREE one-year Performance Warranty on most of our products. The Long & McQuade Performance Warranty supplements the manufacturer’s warranty to ensure that our customers receive complete “no hassle” warranty coverage within their first year.

How does the Long & McQuade Performance Warranty differ from most manufacturers' warranties?
  • Performance Guarantee: Normal wear and tear is covered, so your product will be performing as well as the day you purchased it for the entire duration of the coverage. Band and Orchestral Performance Warranty does not include replacing pads or cleaning for woodwind instruments, unless deemed necessary by our repair staff. Ultrasonic cleaning for brass instruments will be provided if deemed necessary by our repair staff, but is not routinely offered under the Performance Warranty.
  • Product Replacement: If your product cannot be fixed or costs too much to fix, we will replace it with the equivalent model for no additional charge. If this is not possible, a full refund will be provided.
  • No Lemon Policy: Your product will be replaced should the same problem occur multiple times.
  • Convenient: Easy drop off and pick up of the product at any Long & McQuade location.
  • Guitar Setup: Guitars purchased at Long & McQuade come with 1 free setup, to be redeemed within 1 year for new guitars and 90 days for used guitars.
  • Loaners Available: A loaner product may be given while the product is being repaired.
  • Power Surge Protection: Your product is covered even if damaged from a power surge.
  • Accessory Coverage: Any peripheral devices or accessories that come with your product (i.e. foot pedal, case) are also covered.
  • Commercial Use Coverage: Music and recording professionals who purchase gear for “heavy-use” commercial purposes will still be covered.

Long & McQuade reserves the right to restrict the purchase of additional years of Performance Warranty. Used products come with a 3-month Long & McQuade Performance Warranty. Some products (i.e. computers, software, cymbals and other items) are covered only by the manufacturer‘s warranty. Consumables (i.e. strings, reeds, drum sticks, batteries, tubes, cross faders) are excluded as they are designed to be replaced. Cosmetic Damage, Accidental Damage, or problems caused by Humidity or Temperature Issues are not covered. Speakers damaged by overpowering are generally not covered. Our coverage does not provide compensation for loss of use. As of June 2018 the Performance Warranty is no longer transferable. The warranty is only valid in Canada.

Purchasing additional years of coverage

Some manufacturers provide warranties for longer than 1 year; however, these are usually limited warranties that do not provide the same coverage as the Long & McQuade Performance Warranty. Customers interested in more complete and convenient (but not necessarily longer) coverage are still able to purchase additional years of the Performance Warranty.

If you are interested in receiving this coverage for longer than one year, you have the option of purchasing additional years of the Performance Warranty. The pricing is as follows:

  • NEW products: 4% of the current new selling price to double the warranty from 1 year to 2 years. 4% for each additional year.
  • USED products: 4% of the current new selling price to increase the warranty from 3 months to 1 year. 4% for each additional year.
  • GUITARS: 4% of the current new selling price to double the warranty from 1 year to 2 years. 4% for each additional year. $45 maximum. An additional free setup is not included with additional purchased years of Performance Warranty.
  • BAND and ORCHESTRAL instruments: 4% of the current new selling price to double the warranty from 1 year to 2 years. 4% for each additional year.

Great Additions