What inputs and outputs does the 640m have?

The unit provides 6 inputs (4 balanced mic/line switchable Euroblock connectors plus 2 unbalanced RCA pairs) and 4 independent outputs. Maximum input levels are +20 dBu on Euroblock and +12 dBu on RCA; outputs deliver up to +20 dBu balanced or +12 dBu unbalanced.

Can I integrate this with third-party control systems?

Yes. The 640m includes Ethernet and RS-232 ports for remote operation and third-party system integration, plus 2 input insert positions and 1 output insert position for patching external processors directly into the signal flow.

How does this compare to the Behringer FCA1616 or PreSonus StudioLive RML32?

The 640m is purpose-built for zone-based distributed audio with transparent signal integrity (113+ dB dynamic range) and a shallow 1.75-inch depth for retrofit installations, making it more compact than full-featured mixing consoles; it excels in fixed multi-room setups rather than live FOH mixing or recording studio control surfaces.

What is the AutoWarmth psychoacoustic function?

AutoWarmth is a psychoacoustic processing function available on each output zone; it enhances perceived warmth and presence in the audio without coloring the transparent signal path, ideal for refining zone-based playback character.

Is this unit rackable, and how much space does it need?

Yes, the 640m is a 19-inch rackmountable unit with a shallow 1.75-inch depth (19 × 7.75 × 1.75 inches), weighs 6.05 lbs, and consumes 29 watts, making it ideal for compact AV installations and retrofit applications where vertical rack space is limited.

dbx 640m 6x4 Digital Zone Processor

The dbx 640m is a compact yet powerful digital zone processor that brings professional-grade routing and mix management to studio and post-production environments. This 19-inch rackmountable unit delivers transparent signal processing in a shallow 1.75-inch depth, making it ideal for fitting into existing studio racks without sacrificing I/O flexibility. Its combination of balanced and unbalanced inputs, psychoacoustic processing, and remote control integration positions it as a reliable tool for session work requiring multi-output monitoring, submix routing, and independent zone-level control.

Signal Path & I/O Architecture

The 640m combines 6 inputs (4 balanced mic/line switchable Euroblock connectors plus 2 unbalanced RCA pairs) with 4 independent outputs, each capable of delivering up to +20 dBu (Euroblock) or +12 dBu (RCA). The dbx Type IV A/D converter exceeds 113 dB dynamic range on line signals, ensuring transparent audio fidelity across the signal chain. Input impedance specs range from >50 kΩ balanced to >25 kΩ unbalanced, accommodating both professional studio sources and consumer-level devices without compromise, making it versatile for tracking, mixing, and monitoring workflows.

Control & Metering Systems

On-unit control includes hardware-managed microphone gain adjustment per channel, 4 independent six-segment lightpipe output meters (-30 to +20 dBu), and an LCD display providing real-time feedback on source selection, page navigation, zone volume, and mute status. Ethernet and RS-232 ports enable remote operation and integration with third-party control systems and DAW workflows, while 2 input insert positions and 1 output insert position allow external processing to be patched directly into the signal flow for creative submix processing and specialized effects routing.

Key Features

19-inch rackmountable chassis (19 × 7.75 × 1.75 inches)
6 total inputs: 4 balanced mic/line switchable via Euroblock, 2 unbalanced RCA pairs
4 independent outputs with zone-based routing
dbx Type IV A/D converter with >113 dB dynamic range (line)
Maximum input levels: +20 dBu Mic/Line (Euroblock), +12 dBu RCA
Output impedance: 120Ω balanced, 60Ω unbalanced
4 independent six-segment lightpipe output meters (-30 to +20 dBu)
Hardware-controlled microphone gain per channel
2 input insert positions and 1 output insert position for external processing
AutoWarmth psychoacoustic function on each output zone
Ethernet and RS-232 control ports for third-party system integration
100–240 VAC input, 29-watt power consumption; weighs 6.05 lbs

The 640m delivers multi-zone mix management with transparent audio quality and flexible I/O architecture, making it an effective choice for home studios and production facilities requiring reliable digital processing and independent output control.

Condition	New
Country of Manufacture	China