640 ZonePRO 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 codeveloped 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.

• 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


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 +20 dBu Mic/Line, +12 dBu RCA
CMRR >40 dB, typically >55 dB @ 1 kHz
Mic Preamp gain 30 to 60 dB
Mic Preamp Equivalent Input Noise (EIN) <-118 dB
Mic Preamp Phantom Power 15V
Output 4 total
Output Connectors Euroblock
Output Type Electronically Balanced, RF Filtered
Output Impedance 120 ohms balanced, 60 ohm unbalanced
Max Output +20 dBu
A/D Converter dbx Type IV conversion system
A/D Dynamic Range (line) >113 dB, A-weighted, >110 dB unweighted
Type IV Dynamic Range >119 dB, A-weighted, 22 kHz; BW: >117 dB, unweighted, 22 kHz BW
Digital Output RCA 24-Bit oversampling
Digital Output Dynamic Range >114 dB A-weighted, 110 dB unweighted
Sample Rate 48 kHz
D/A Dynamic Range 112 dB A-weighted, 109 dB unweighted
Dynamic Range >109 dB A-weighted, >106 dB unweighted
THD+Noise 0.003% typical at +4 dBu, 1 kHz, 0 dB gain
Frequency Response 20 Hz - 20 kHz, +/-0.5 dB
Interchannel Crosstalk >80 dB typical
Propagation Delay 0.6 msec
Operating Voltage 100 VAC 50/60 Hz, 120 VAC 60 Hz and 230 VAC 50/60 Hz
Power Consumption 29 W
Unit Weight 6.8 lb.(3.1 kg)
Shipping Weight 8.8 lb. (4.0 kg)
Dimensions 1.75” H x 5.75” D x 19” W
Safety Agency Certifications UL 600065, IEC 60065, EN 55013, E60065
More Information
Weight 9.000000
Length 22
Width 11.5
Height 3.5
Color Black
Manufacturer dbx by HARMAN
Manufacturer Model Number 640
Manufacturer Part Number DBX640V
UPC 691991400728
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