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Cadac CM-SR Series Group

Audio Stage Racks


The CM-SR series of stage racks provide the Cadac CM audio mixing system with a range of feature rich, flexible remote I/O units.

CM-SR: Welcome
Cadac CM-SR64 remote audio I/O stage rack

CM-SR Series

Cadac CM logo


The new, high density CM-SR40, CM-SR24 and the CM-SR64 are the first in a series of Cadac's CM stage racks, featuring the same exceptional, high performance I/O cards as the CM console. There are two 4U units, the CM-SR40 with 32 analogue inputs and 8 analogue outputs, and the CM-SR24 with 16 analogue inputs and 24 analogue outputs. The 7U CM-SR64 is configured with 56 analogue inputs and 32 analogue outputs. All three have 8 AES3 inputs and 8 AES3 outputs on a total of 8 XLRs.

They all feature a 2.4” colour TFT, which displays the menu structure allowing local adjustment of the incoming levels, mic gain and phantom power settings. The integrated headphone amp adds the useful and time saving ability of monitoring the audio at the stage rack.

The CM-SR Series feature dual MegaCOMMS ports on BNC, or LC optical ports for redundant connection of up to 2 km from the console, and come preconfigured with dual redundant internal PSUs for mission critical applications. All packaged within a robust, lightweight, compact aluminium chassis.

CM-SR: Introduction
Cadac CM-SR24 remote audio I/O stage rack



  • 2.4” colour TFT for system control

  • Rotary encoder allows simple menu navigation

  • 16 to 56 balanced fully programmable mic inputs on XLR sockets

  • 8 to 32 analogue outputs

  • 48 V LED indicators on analogue inputs

  • MUTE LED indicators on analogue outputs

  • 8 AES3 inputs (with SRC) and 8 outputs on 8 XLR sockets

  • 96 kHz internal Word Clock

  • 2 pairs of MegaCOMMS ports on RG6 BNC connectors and on 2 duplex optical LC ports

  •  ¼” stereo headphone socket with attenuator

  • Dual internal, redundant, auto switching PSUs

CM-SR: Hardware Overview
Cadac CM-SR40 remote audio I/O stage rack



  • Intuitive menu structure

  • Rack custom naming for easy identification

  • Snake mode

  • OSC controllable

  • Local control of the analogue Port, Gain, 48 V, Pad, MUTE and Monitor

  • Local control of the AES port pair, Direction, Clock, Rate, Channel and Monitor

  • Word Clock modes: lead or follow

  • Word Clock options of 44.1, 48 or 96 kHz

  • Optical connections allow stage rack location up to 2000 metres from control surface 

  • Maintenance mode

  • Compact, lightweight aluminium construction

CM-SR: Features Overview

CM-SR Series

Cadac CM-SR64 Front Right Grey.jpg

56 Analogue Inputs

32 Analogue Outputs

8 AES3 Inputs

8 AES Outputs

1 Headphone Amp

2 PSUs


Cadac CM-SR40 grey.jpg

32 Analogue Inputs

8 Analogue Outputs

8 AES3 Inputs

8 AES Outputs

1 Headphone Amp

2 PSUs


Cadac SR24 Right Grey.jpg

16 Analogue Inputs

24 Analogue Outputs

8 AES3 Outputs

8 AES Inputs

1 Headphone Amp

2 PSUs


Hear the Difference

Cadac's stage racks feature, what is considered by many audio professionals, 

the industry's finest sounding mic pre.

CM-SR: Features


Cadac CM-SR remote audio stage racks up to 56 analogue inputs
  • Pre-configured with 16 to 56 fully programmable, low-noise, wide dynamic-range mic preamps on XLRs.

  • Identical to the console's local I/O - 96 kHz, 24-bit Delta-Sigma A/D and D/A converters - ensuring consistent audio performance throughout the entire system.

  • Gain control either remotely and locally.

  • 48 V phantom power available on all inputs.


Cadac CM-SR series remote audio stage rack up to 32 analogue outputs
  • Pre-configured with 8 to 32 balanced line outputs on XLRs.

  • The stage racks have identical characteristics to the consoles local outputs. 

  • Any output channel, insert send or direct out may be routed to the outputs.

  • Each output can be "hard" muted, complete with LED indication.


Cadac CM-SR remote audio stage rack 8 AES3 inputs outputs
  • Four female XLR sockets provide eight AES3 format digital inputs.

  • The input pairs are fitted with Sample Rate Converters (SRCs) and will accept sample rates between 44.1, 48 and 96 kHz.

  • Four male XLR connectors provide eight AES3 format digital outputs from the console.

  • Clock options for the output pairs include: External, Internal and Input Port


Cadac CM-SR series remote audio stage rack 2.4" control screen
  • The 2.4-inch colour display shows the stage rack's intuitive menu structure.

  • Menu navigation is done via the two select buttons and a rotatory / push  encoder.

  • The menu provides access to the analogue port, gain, 48 V, Pad, Mute.

  • The screen provides control of the AES Port Pair, Direction, Clock, Rate, Channel. 

  • Headphone amp allows local monitoring of an input or output.


Cadac CM-SR series remote audio stage rack MegaCOMMS ports - BNC and optical
  • Each stage rack has four pairs of MegaCOMMS ports - 2 pairs on BNCs and 2 duplex optical LC ports - carrying all audio and control data between the control surface and the stage racks.

  • Each pair of ports is capable of transmitting 128 bi-directional channels of 96 kHz / 24-bit audio.

  • Two MegaCOMMS paths, A and B (either over RG6 or optical), carry identical and synchronous data, and provides redundancy if both A and B are attached to a single stage rack.

  • The duplex LC ports allow connection of the stage racks up to 2000 m from the control surface via singlemode fibre.


Cadac CM-SR24 remote audio stage rack dual PSUs
  • All units feature internal, dual redundant, auto switching power supplies for mission critical applications.

  • The stage racks are fitted with two low noise fans for noise sensitive installation.

  • All housed it a road rugged, yet light and compact, aluminium chassis.


Cadac CM-SR24
Cadac CM-SR64
Cadac CM-SR40
Cadac CM-SR64
Cadac CM-SR24


General Specification


2.4-inch, 240 x 320 pixels, 262k colour display


16 x XLR Mic Inputs (inc 48 V, PAD and 1 dB gain steps)

24 x XLR Balanced outputs

4 x XLR AES/EBU inputs

4 x XLR AES/EBU outputs


32 x XLR Mic Inputs (inc 48 V, PAD and 1 dB gain steps)

8 x XLR Balanced outputs

4 x XLR AES/EBU inputs

4 x XLR AES/EBU outputs


56 x XLR Mic Inputs (inc 48 V, PAD and 1 dB gain steps)

32 x XLR Balanced outputs

4 x XLR AES/EBU inputs

4 x XLR AES/EBU outputs


Neutrik connectors

Tolerant of 48 V connection and short circuit protected

Headphone Amp

¼ “(6.35mm) 3-pole (TRS)

With attenuator


2 x Cadac MegaCOMMS on:

4 x BNC connectors

2 x duplex optical LC ports (requires Transceiver Cartridge)


2 x internal PSUs

100-240V AC 50-60 Hz

Output requirements: +17 V, -17 V, +12 V


CM-SR24: 482.6 mm width x 365 mm depth x 177 mm height

CM-SR40: 482.6 mm width x 365 mm depth x 177 mm height

CM-SR65: 482.6 mm width x 365 mm depth x 310 mm height


CM-SR24: 7.1 kgs / 15.65 lb (approx)

CM-SR40: 7.1 kgs / 15.65 lb (approx)

CM-SR64: 10.2kgs / 22.29 lb (approx)

Audio Specification


96 kHz


Sub 0.4 millisecond latency through complete signal chain


40-bit floating point




20 Hz to 44 kHz + 0.5 / -1.5 dB


better than 0.005% @unity gain, 10 dB input at 1 kHz


better than 90 dB


< -90 dBu (20 Hz – 20 kHz)


< -127 dB with 200 Ohm source impedance


21 dBu

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