dbx 640

6x4 Digital Zone Processor

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With 6 inputs and 4 outputs the dbx ZonePRO® 640 provides flexible signal routing, powerful DSP processing and multiple control interfaces for Commercial Audio applications.

Designed to offer superior system sonic performance and flexibility, the 640/641 deliver the highest quality tools available. Even the input and outputs connectors were chosen for their standard usage and reliability. The ZonePRO products offer Euroblock connectors for balanced signals and RCA connectors for interfacing with consumer equipment often used in commercial applications; there is also a simple analog input buss that allows inputs to be sent from one unit to the next for unit and job scalability. The 640 and 641 provide every necessary processing tool, from the input processing like gain control and EQ available on all inputs to highly sophisticated and specific functions such as selectable paging microphone processing including Gating, De-Essing, Auto Gain Control, Compression and Feedback Suppression. The heart of the ZonePRO products is the Routing module that provides of course Primary Source Selection but also Source Ducking for Paging and Priority Override. The outputs also offer a wealth of processing designed for commercial applications like our patent-pending AutoWarmth® function that was co-developed with JBL to provide natural low frequency extension at any signal level. Each output also offers EQ, Bandpass and Crossover filters, Limiting and Delay for system optimization. With the ZonePRO® every tool is at your disposal to maximize the response of your system.

Beyond processing, the ZonePRO® products offer multiple forms of control to further extend the versatility of your system. From easy-to-use wall panel Zone Controllers for standard end-user functions like source select and volume control to advanced system control including a built-in Real Time Clock that can provide programmable system changes throughout the day or week. For system setup and monitoring the ZonePRO Designer software provides an intuitive interface and a speedy setup Wizard for configuring and editing all system parameters.

The ZonePRO® 640 will take your Commercial Audio system to the next level with advanced processing, versatility and control.

Recommended for: Installed.


  • Advanced Feedback Suppression (AFS™)
  • Autowarmth®
  • Auto Gain Control
  • Compression
  • Limiting
  • Noise Gating
  • Notch Filtering
  • Bandpass and Crossover Filters
  • Parametric EQ
  • Security Lockout
  • Wall Panel Control
  • RS-232 Control
  • Windows® 2000 and XP GUI
  • IEC, UL and CSA Approvals


  Version Language Size Uploaded
file type icon 640 Application Guide-English
en updated: Sep 2023
  en  2.11 MB Sep 2023
file type icon 640 Brochure-English
en updated: Sep 2023
  en  733 KB Sep 2023
file type icon 640 CAD drawing front
en updated: Sep 2023
  en  234 KB Sep 2023
file type icon 640 CAD drawing rear
en updated: Sep 2023
  en  295 KB Sep 2023
file type icon 640 Cut Sheet-English
en updated: Sep 2023
  en  1.42 MB Sep 2023
file type icon 640 Install Guide-Spanish
es updated: Sep 2023
  es  487 KB Sep 2023
file type icon ZonePRO-640-Restaurant-Bar-application.pdf
en updated: Sep 2023
  en  1.91 MB Sep 2023
file type icon ZonePRO-640-Retail-application.pdf
en updated: Sep 2023
  en  1.71 MB Sep 2023
Tech Notes
file type icon ZC Connectivity and Association
updated: Oct 2020
    274 KB Oct 2020
platform icon AMX dbx ZonePRO Controllers
version 2.1, updated: Aug 2016
2.1     563 KB Aug 2016
platform icon Crestron dbx ZonePRO controller
version 3.0, updated: Aug 2016
3.0     4.99 MB Aug 2016
platform icon ZonePRO String Calculator
version 1.3, updated: Aug 2016
1.3     184 KB Aug 2016
platform icon ZonePRO GUI Designer
version 3.2, updated: May 2022
3.2     15.1 MB May 2022
Install Guides
file type icon Install Guide-English
updated: Oct 2020
    11 MB Oct 2020
3rd Party Resources
file type icon ZonePro Protocol Guide
updated: Oct 2020
    246 KB Oct 2020
Safety Sheets
file type icon Safety Sheet-English
updated: Aug 2017
    328 KB Aug 2017
Quick Start Guides
file type icon Quick Start Guide-English
updated: Aug 2017
    860 KB Aug 2017

If any of the links above result in strange characters in your browser, please right-click the file to save it to your computer.


Input (6 total) (2) Switchable line or mic inputs (4) RCA Source
Input Connectors Euroblock (Line and Mic) RCA (Source)
Input Type Electronically balanced/RF-filtered
Input Impedance 50k ohm balanced, >75k ohm unbalanced
Max Input +20dBu Mic/Line, +12dBu RCA
CMRR >40dB, typically >55dB @ 1 kHz
Mic Preamp gain 30 to 60dB
Mic Preamp Equivalent Input Noise (EIN) <-118dB
Mic Preamp Phantom Power 15V
Output 4 total
Output Connectors Euroblock
Output Type Electronically Balanced, RF Filtered
Output Impedance 120 ohms balanced, 60ohm unbalanced
Max Output +20dBu
A/D Converter dbx Type IV™ conversion system
A/D Dynamic Range (line) >113 dB, A-weighted, >110 dB unweighted
Type IV Dynamic Range >119dB, A-weighted, 22kHz; BW: >117dB, unweighted, 22kHz BW
Digital Output RCA 24-Bit oversampling
Digital Output Dynamic Range >114 dB A-weighted, 110dB unweighted
Sample Rate 48kHz
D/A Dynamic Range 112 dB A-weighted, 109dB unweighted
Dynamic Range >109 dB A-weighted, >106 dB unweighted
THD+Noise 0.003% typical at +4dBu, 1kHz, 0dB gain
Frequency Response 20Hz - 20kHz, +/-0.5dB
Interchannel Crosstalk >80dB typical
Propagation Delay 0.6 msec
Operating Voltage 100VAC 50/60Hz, 120VAC 60Hz and 230VAC 50/60Hz
Power Consumption 29 W
Unit Weight 6.8 lbs.(3.1 kg)
Shipping Weight 8.8 lbs. (4.0 kg)
Dimensions 1.75” H x 5.75” D x 19” W
Safety Agency Certifications UL 600065, IEC 60065, EN 55013, E60065

Training Modules



640 FAQs

How Can I Perform a Hard Reset On the 640 ZonePRO?

The following procedure will reset all settings on the ZonePRO 640

While powering on the unit press and hold the <2> button (next to the display) until the following message appears:


Press the <UTIL> button (large knob) in to reset the unit.

Pressing the <PAGE 1> button will abort the System Reset sequence and the unit will reset normally.

How to connect to a dbx ZonePRO Processor using ZonePRO Designer Software

ZonePRO You Tube Video Link:

Connecting to a dbx ZonePRO Processor using ZonePRO Designer Software

How to setup a dbx ZonePRO™ Product using the Configuration Wizard in ZonePro Designer

ZonePRO You Tube Video Link:

Setting up a dbx ZonePRO™ Product using the Configuration Wizard in ZonePro Designer

How do you set up page steering in ZonePRO Designer using dbx ZC-3 and ZC-7 controllers?

ZonePRO YouTube Video Link:

dbx Page Steering with ZC3 and ZC7 Zone Controllers

HARMAN Professional Solutions:

dbx 640

6x4 Digital Zone Processor