dbx ZonePRO 640 6x4 Digital Zone Processor

The dbx ZonePRO 640 Digital Zone Processor provides professional audio routing, signal processing, and independent zone control for commercial sound installations. Featuring 6 inputs and 4 outputs, the ZonePRO 640 allows installers to distribute background music, microphone audio, and paging signals to multiple areas while maintaining precise control over each zone.

Designed for restaurants, retail stores, hotels, conference facilities, houses of worship, and other commercial environments, the ZonePRO 640 combines flexible source selection with advanced digital signal processing in a compact, rack-mountable unit.

The processor features two balanced microphone/line inputs and four unbalanced RCA source input pairs, making it easy to integrate professional microphones, music players, and other audio sources.

Its built-in DSP provides input equalization, compression, noise gating, automatic gain control, feedback suppression, and paging priority functions. Output processing includes parametric EQ, crossover filters, limiting, delay, and dbx AutoWarmth® technology.

The ZonePRO 640 also supports optional wall-mounted Zone Controllers, allowing users to adjust volume and select audio sources without accessing the equipment rack.

With programmable scheduling, flexible routing, and configuration through ZonePRO Designer software, the dbx ZonePRO 640 is a versatile solution for managing audio throughout commercial facilities.

dbx ZonePRO 640 Key Features

• 6 Inputs / 4 Outputs: Provides flexible source routing and independent control for up to four output zones.
• Two Balanced Mic/Line Inputs: Accepts compatible microphones and professional line-level audio sources.
• Four RCA Source Input Pairs: Connects consumer audio equipment and background music sources.
• Advanced Digital Signal Processing: Includes EQ, compression, noise gating, de-essing, automatic gain control, and feedback suppression.
• Flexible Audio Routing: Supports source selection, paging ducking, and priority override.
• dbx AutoWarmth® Technology: Maintains perceived low-frequency fullness at reduced listening levels.
• Output Processing: Provides parametric EQ, bandpass and crossover filters, limiting, and delay.
• Independent Zone Control: Allows different audio sources and volume settings for connected zones.
• Optional Wall Controllers: Supports compatible dbx Zone Controllers for local volume and source selection.
• Built-In Real-Time Clock: Enables scheduled system changes throughout the day or week.
• RS-232 Communication: Supports system configuration and external control integration.
• ZonePRO Designer Software: Provides a graphical interface and configuration wizard for system setup.
• Analog Link Bus: Allows compatible ZonePRO units to share audio sources when expanding a system.
• 1RU Rack-Mount Design: Fits standard 19-inch equipment racks.

Flexible Audio Routing for Four Zones

The dbx ZonePRO 640 is designed for commercial installations where different areas require independent audio control.

For example, a restaurant can use the processor to distribute background music to the dining room, bar, private event space, and outdoor seating area.

Each output zone can be configured with appropriate source routing, volume settings, and audio processing.

This allows an installer to tailor the audio system to the needs of each space while maintaining centralized equipment management.

Advanced DSP Processing and Paging Priority

The ZonePRO 640 includes a comprehensive collection of digital audio processing tools.

Input processing options include:

• Parametric equalization
• Compression
• Noise gating
• Automatic gain control
• De-essing
• Advanced feedback suppression

The routing section supports paging ducking and priority override, allowing important announcements to take precedence over background music.

Output processing provides additional control through equalization, crossover filtering, limiting, and delay.

These functions help installers optimize speech intelligibility, maintain consistent listening levels, and protect connected audio equipment.

dbx AutoWarmth® Technology

The ZonePRO 640 includes dbx AutoWarmth technology on its output zones.

AutoWarmth helps maintain the perceived fullness of music at lower listening levels by compensating for changes in perceived low-frequency response.

This is especially useful in restaurants, hotels, and retail stores where background music levels may change throughout the day.

Wall-Mounted Zone Control and Scheduling

The ZonePRO 640 supports optional dbx Zone Controllers for convenient adjustment of system functions.

Depending on the compatible controller and configuration, users can adjust zone volume, select audio sources, and recall programmed settings.

The built-in real-time clock also allows installers to schedule changes automatically.

For example, a retail store can use different background music settings during normal business hours and after-hours events.

dbx ZonePRO 640 Technical Specifications

Specification	Details
Manufacturer	dbx Professional
Model	ZonePRO 640
Product Type	Digital commercial audio zone processor
Total Inputs	6
Total Outputs	4
Mic/Line Inputs	2 balanced, switchable
Source Inputs	4 unbalanced, mono-summed RCA pairs
Input Connections	Euroblock and RCA
Output Connections	Balanced Euroblock
Maximum Input Level	+20 dBu mic/line; +12 dBu RCA
Maximum Output Level	+20 dBu
Microphone Preamp Gain	30–60 dB
Phantom Power	15V DC
Output Impedance	120 ohms balanced; 60 ohms unbalanced
A/D Conversion	dbx Type IV
Sampling Rate	48 kHz
Dynamic Range	Greater than 109 dB, A-weighted
Frequency Response	20 Hz–20 kHz, ±0.5 dB
THD + Noise	0.003% typical
Interchannel Crosstalk	Greater than 80 dB typical
Propagation Delay	0.6 ms
DSP Functions	EQ, compression, limiting, gating, feedback suppression, delay, crossover filters
Zone Control	Optional dbx Zone Controllers
Software	ZonePRO Designer
Computer Connection	RS-232
Power Consumption	29 watts
Rack Height	1RU
Width	19 inches
Height	1.75 inches
Unit Weight	6.8 lb (3.1 kg)
Shipping Weight	8.8 lb (4.0 kg)

Installation note: The manufacturer's documents contain conflicting depth measurements. Confirm rack clearance against the current installation drawing before installation.

Recommended Applications

Restaurants and Bars

Manage separate audio zones for dining areas, bars, private rooms, and outdoor seating.

Retail Stores

Distribute background music to different departments while maintaining independent volume control.

Hotels and Hospitality

Provide audio routing and paging priority for lobbies, restaurants, meeting spaces, and common areas.

Conference Facilities

Control microphone and program audio across multiple meeting rooms and presentation spaces.

Houses of Worship

Manage audio distribution to overflow rooms, gathering areas, and auxiliary spaces.

Commercial Buildings

Combine background music, paging, and zone-specific audio processing in a centralized system.

Installation and System Compatibility

The dbx ZonePRO 640 processes and routes line-level audio signals.

It does not provide speaker-level amplification. Its outputs must connect to compatible power amplifiers or other appropriate audio equipment.

The processor can be configured through ZonePRO Designer software using its supported RS-232 connection.

Optional compatible dbx Zone Controllers provide convenient local access to selected system functions.

Why Buy the dbx ZonePRO 640 from Audio Supply?

Audio Supply offers dbx professional audio processors for commercial sound installations. We can help you select compatible zone controllers and audio equipment for your project.

Need a Compatible Zone Controller?

The dbx ZonePRO 640 supports optional Zone Controllers for convenient local volume adjustment and source selection.

Contact Audio Supply for assistance choosing the appropriate dbx Zone Controller for your installation.