Product Description
DBX DBX676FX Tube Microphone Preamp Channel Strip
The Pedigree of Professional Audio.
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
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) |
Other Details
LIMITED PRODUCT WARRANTY For HARMAN Professional Products Purchased from HARMAN Professional Authorized Dealers What is the warranty period? This warranty protects you for a specific period (“Warranty Period”) from your date of purchase as stated in your bill of sale or as otherwise established by Harman. The specific Warranty Period applicable to this product varies for each product type or model, and is determined in accordance with the Warranty Period Table below. If there is no Warranty Period expressly stated in the Warranty Period Table below for any particular product that you have purchased, then, to the fullest extent allowed by law, no warranty is provided for such product. Any warranty service or parts replacement will not extend the Warranty Period. Any warranty replacement parts or product will assume only the remainder of Warranty Period of the original product. Unless otherwise expressly stated in the Warranty Period Table, if a product is co-branded with two or more Harman Professional brands, the applicable Warranty Period will be the one for the brand under which the entire product or product system, as the case may be, is sold, and not for any of the individual component products that make up the product or product system, as the case may be. What does this warranty cover, and what does it not cover? Except as otherwise stated in this policy, this warranty covers defects in materials and workmanship if: (1) you purchased this product from a dealer that is a Harman Professional authorized dealer with respect to this product at the time of your purchase; (2) your original, dated bill of sale is presented whenever warranty service is required during the warranty period; and (3) unless Harman states otherwise, you purchased this product in brand new condition. This policy does not cover damage or loss: caused by accident (including force majeure or natural forces), misuse, abuse, neglect, product modification; occurring during shipment (even when Harman has arranged or paid for shipping); caused by failure to follow instructions in the owner’s guide, including failure to perform recommended periodic or routine maintenance or improper maintenance; resulting from repairs by someone Harman did not authorize; (for products not specified by Harman for commercial or industrial use) caused by any commercial or industrial use; to the decorative surface of this product; to any data, software or information; caused by using this product for other than its intended purpose; or covered under any of your (or your installer’s) insurance policy or coverage. The following are also excluded from this warranty: claims based upon any misrepresentations by the seller; if this product’s serial number has been altered, defaced or removed; deterioration of component parts, the nature of which is to become worn or depleted with use, including batteries and headphone/headset ear pads/foam pads; any accessory to this product, even if supplied by Harman; any installation, removal or re-installation; any set-up calibration or adjustment; any performance variations due to installation-related circumstances, such as program source quality or AC power fluctuations. Harman reserves the right to change the design of, or upgrade, any product from time to time without notice and with no obligation to make any changes or upgrades to any products previously sold or manufactured. What will Harman do to correct problems under warranty? If this product has a defect covered by this warranty, Harman will, at its sole option, either: (1) repair this product at no charge to you, using new or refurbished replacement parts, (2) exchange this product with a product that is new or which has been manufactured from new or serviceable used parts and is at least functionally equivalent to this product, or (3) refund the purchase price of the product. Any replaced or refunded parts or products shall become Harman property, and, by submitting any product for warranty service, you represent and warrant to Harman that you are the sole owner of such product, and that it is not subject to any liens or encumbrances. Who is protected by the warranty? This warranty protects only the original end-user (“you”), and is not transferrable. Any attempt to transfer this warranty shall immediately make this warranty void. This warranty is valid only for Harman Professional products, as listed above, purchased from authorized Harman Professional dealers within the fifty United States, and it does not apply to products purchased or transferred elsewhere. If you purchased this product (or have subsequently transferred it) outside the fifty United States, you should contact your local Harman distributor for warranty information. How can warranty service be obtained? In the event that you require warranty service on this product in the United States, you should first contact us directly using the contact information provided below: US Post-Sales Support Technical Support 1-844-776-4899 (Option 3) HProTechSupportUSA@harman.com Repair Services 1-844-776-4899 (Option 2) HProServiceUSA@harman.com Customers outside the United States should contact your local Harman distributor for warranty information. You must be ready to provide detailed information on the symptoms or difficulties you have observed with the product’s performance. We may direct you to an authorized service center or ask you to send the product to us for repair. In either case, you will have to present your original bill of sale to establish warranty coverage. Do not send this product to us without prior authorization and a corresponding return authorization number. Warranty repair of this product must be done by an authorized dealer or service center. To the fullest extent allowed by law, unauthorized warranty repair will void the warranty and is done at your risk. You are responsible for transporting your product to (as well as from, in the event that Harman finds no defect covered by this warranty) either Harman or an authorized service center and for payment of all shipping charges; however, Harman will pay the return shipping charges (in the event you return the product to Harman) if the repairs are covered by warranty, provided that, Harman reserves the right to choose the mode, the carrier and the timing of such return shipping (if Harman finds that there are no defects covered by this warranty, then you shall be responsible for all shipping charges). If you experience difficulty in transporting your product or are in need of packing materials, please advise us and we may be able (but have no obligation) to suggest alternative procedures and/or provide adequate packing materials. In the event Harman is unable to return the product to you because you have provided incorrect or insufficient contact information, or when you fail to arrange for the pick-up or retrieval of the product when you are obligated to arrange or pay for shipping the product back to you, Harman reserves the right, without notice to you, to charge you storage and handling costs for the entire duration that Harman has possession of your product, and, to the fullest extent allowed by law, to sell or dispose of your product to defray such costs. You hereby authorize Harman to charge those costs against any credit or debit card or other electronic payment account you have provided to us for any reason. THIS WARRANTY AND REMEDIES SET FORTH ABOVE ARE EXCLUSIVE AND IN LIEU OF ALL OTHER WARRANTIES, REMEDIES AND CONDITIONS, WHETHER ORAL OR WRITTEN, EXPRESS OR IMPLIED. HARMAN SPECIFICALLY DISCLAIMS ANY AND ALL IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IF HARMAN CANNOT LAWFULLY DISCLAIM IMPLIED WARRANTIES UNDER THIS LIMITED WARRANTY, ALL SUCH WARRANTIES, INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE LIMITED IN DURATION TO THE DURATION OF THIS WARRANTY. No Harman reseller, agent, or employee is authorized to make any modification, extension, or addition to this warranty. HARMAN IS NOT RESPONSIBLE FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES RESULTING FROM ANY BREACH OF WARRANTY OR CONDITION, OR UNDER ANY OTHER LEGAL THEORY, INCLUDING BUT NOT LIMITED TO LOST PROFITS, DOWNTIME, GOODWILL, DAMAGE TO OR REPLACEMENT OF ANY EQUIPMENT OR PROPERTY, ANY COSTS OF RECOVERING, REPROGRAMMING, OR REPRODUCING ANY PROGRAM OR DATA STORED IN OR USED WITH HARMAN PRODUCTS. HARMAN’S TOTAL LIABILITY IS LIMITED TO THE REPAIR OR REPLACEMENT OF THIS PRODUCT OR TO THE ORIGINAL PURCHASE PRICE PURSUANT TO THE TERMS OF THIS WARRANTY. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES OR EXCLUSIONS OR LIMITATIONS ON THE DURATION OF IMPLIED WARRANTIES OR CONDITIONS, SO THE ABOVE LIMITATIONS OR EXCLUSIONS MAY NOT APPLY TO YOU. THIS WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS, AND YOU MAY ALSO HAVE OTHER RIGHTS THAT VARY BY STATE OR (WHERE APPLICABLE IN THE COUNTRIES WHERE HARMAN HAS NON-US/CANADIAN AUTHORIZED DEALERS) COUNTRY. NO ACTION OR CLAIM TO ENFORCE THIS WARRANTY SHALL BE COMMENCED AFTER THE EXPIRATION OF THE WARRANTY PERIOD. In the event that there is a difference between this warranty and the provisions in any owner’s manuals, warranty leaflets, or packaging cartons, the terms of this warranty will prevail to the fullest extent allowed by law. Updated: July 2021Product Videos
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Corey Congilio and dbx676 Tube Mic Preamp Channel Strip
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