dbx 640m

6x4 Digital Zone Processor

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The ZonePRO 640m offers fixed I/O, pre-configured architecture, configurable insert processing and optional duplication of audio channels to another ZonePRO device via a link bus.

The 640m features a total of six inputs and four outputs. Inputs include four balanced mic/line switchable terminal block inputs and two mono-summed pairs of unbalanced RCA inputs. Hardware-controlled microphone gain allows adjustment of microphone gain per channel.

The 640m device has a pre-configured architecture with input processing, a central matrix and output processing. Two input insert positions and one output insert position allow channel-specific insert processing to be configured. AutoWarmth®, a psychoacoustic function that maintains full frequency bandwidth even when the signal level has dropped, is permanently available on each output zone.

A link bus allows duplication of the first six audio channels to another ZonePRO device in applications where additional output zones are required.

The front panel of the 640m features comprehensive signal metering, an informative LCD display and user-specified front panel control.

Additional system control is offered in the form of optional Zone Controllers. This collection of hardware wall-controllers represents a series of simple, elegant user interfaces for functions such as volume, source and preset control.

All ZonePRO devices can be controlled by third party control systems via RS-232 or Ethernet as applicable (see table for further information).

ZonePRO Designer—the configuration, control and monitoring software for the ZonePRO family of devices—offers control of the ZonePRO 640m via Ethernet or RS-232. The Configuration Wizard within ZonePRO Designer guides users through the step-by-step configuration process of the 640m.


  • 6 Inputs / 4 Outputs
  • 4 Balanced Mic/Line Inputs
  • 2 Unbalanced, Mono-Summed RCA Input Pairs
  • Microphone Gain per Channel
  • Pre-Configured Architecture
  • Two Configurable Input Insert Positions
  • One Configurable Output Insert Position
  • AutoWarmth® per Output Zone
  • Link Bus
  • Comprehensive Signal Metering
  • Front Panel LCD
  • User-Specified Front Panel Control
  • Optional ZC Controllers
  • Ethernet Control
  • Serial Control
  • Third Party Control
  • Wizard-Driven Configuration


  Version Language Size Uploaded
file type icon 640m Application Guide-English
en updated: ก.พ. 2024
  en  2.11 เมกะไบต์ ก.พ. 2024
file type icon 640m Brochure-English
en updated: ก.พ. 2024
  en  733 กิโลไบต์ ก.พ. 2024
file type icon 640m Install Guide-Spanish
es updated: ก.พ. 2024
  es  487 กิโลไบต์ ก.พ. 2024
platform icon AMX dbx ZonePRO Controllers
version 2.1, updated: ส.ค. 2016
2.1     563 กิโลไบต์ ส.ค. 2016
platform icon Crestron dbx ZonePRO controller
version 3.0, updated: ส.ค. 2016
3.0     4.99 เมกะไบต์ ส.ค. 2016
platform icon ZonePRO String Calculator
version 1.3, updated: ส.ค. 2016
1.3     184 กิโลไบต์ ส.ค. 2016
platform icon ZonePRO GUI Designer
version 3.2, updated: พ.ค. 2022
3.2     15.1 เมกะไบต์ พ.ค. 2022
Tech Notes
file type icon ZC Connectivity and Association
updated: ต.ค. 2020
    274 กิโลไบต์ ต.ค. 2020
Install Guides
file type icon Install Guide-English
updated: ต.ค. 2020
    11 เมกะไบต์ ต.ค. 2020
3rd Party Resources
file type icon ZonePro Protocol Guide
updated: ต.ค. 2020
    246 กิโลไบต์ ต.ค. 2020
Safety Sheets
file type icon Safety Sheet-English
updated: ส.ค. 2017
    328 กิโลไบต์ ส.ค. 2017
Quick Start Guides
file type icon Quick Start Guide-English
updated: ส.ค. 2017
    860 กิโลไบต์ ส.ค. 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.


Indicators 4 Independent Six-Segment Lightpipe Output Meters that range from -30 to +20 dBu, Threshold Meters
LCD Display LCD Display provides information about Source Selection, Page Steering, Zone Volume and Mute
Input 6 Total (4) Switchable Mic or Line, (2) Unbalanced, Mono-Summed RCA Input Pairs
Input Connectors Euroblock (Line and Mic) RCA (Source)
Input Type Electronically balanced/RF-filtered
Input Impedance Euroblock: >50kΩ Balanced, >25kΩ Unbalanced, RF Filtered; RCA: >25kΩ Unbalanced, RF Filtered
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) < -118dBu, 22Hz-22kHz, 150Ω Source Impedance
Mic Preamp Phantom Power +15VDC
Output 4 total
Output Connectors Euroblock
Output Type Electronically Balanced, RF Filtered
Output Impedance 120Ω Balanced, 60Ω 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 Dynamic Range >114 dB A-weighted, 110dB unweighted
Sample Rate 48kHz
D/A Dynamic Range 112 dB A-weighted, 109dB unweighted, 22kHz BW
Dynamic Range >109 dB A-weighted, >106 dB unweighted, 22kHz BW
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
BTU <92.13
Unit Weight 6.05 lbs / 2.74 kg
Shipping Weight 8.2 lbs / 4 kg
Dimensions 1.75” (1U) x 19” x 7.75” (45mm x 483mm x 197mm)
Safety Agency Certifications UL 600065, IEC 60065, EN 55013, E60065

Training Modules



640m FAQs

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

The following procedure will reset all settings on the ZonePRO 640m

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 640m

6x4 Digital Zone Processor