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Cadac CM-SR series stage racks — CM-SR64, CM-SR24 and CM-SR40 remote I/O units for the CM-J50 mixing console

Audio Stage Racks

Overview

The Cadac CM-SR series are high-density, feature-rich remote stage racks for the CM-J50 digital mixing console. Three models connect via MegaCOMMS, Cadac's proprietary audio network, extending the system's I/O up to 2,000 metres from the control surface.

CM-SR: Welcome
Cadac CM-SR64 stage rack front panel — 56 analogue inputs, 32 outputs, AES3 I/O and MegaCOMMS connectivity

CM-SR Series

Cadac CM logo

Introduction

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 stage rack — 16 analogue mic inputs, 24 outputs, 2.4-inch colour display and dual PSUs

Hardware

Overview

  • 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 stage rack — 32 analogue inputs, 8 outputs, OSC controllable with local gain and phantom power control

Features

Highlights

  • 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 stage rack front panel — 56 analogue inputs, 32 outputs, AES3 I/O and MegaCOMMS connectivity

56 Analogue Inputs

32 Analogue Outputs

8 AES3 Inputs

8 AES Outputs

1 Headphone Amp

2 PSUs

CM-SR64

Cadac CM-SR40 stage rack — 32 analogue inputs, 8 outputs, OSC controllable with local gain and phantom power control

32 Analogue Inputs

8 Analogue Outputs

8 AES3 Inputs

8 AES Outputs

1 Headphone Amp

2 PSUs

CM-SR40

Cadac CM-SR24 stage rack — 16 analogue mic inputs, 24 outputs, 2.4-inch colour display and dual PSUs

16 Analogue Inputs

24 Analogue Outputs

8 AES3 Outputs

8 AES Inputs

1 Headphone Amp

2 PSUs

CM-SR24

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

ANALOGUE INPUTS

Cadac CM-SR stage rack analogue input section — 16 to 56 fully programmable XLR mic inputs with 48V phantom power

  • 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.

ANALOGUE OUTPUTS

Cadac CM-SR stage rack analogue output section — 8 to 32 balanced XLR line outputs with hard mute and LED indication

  • 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.

AES3 INPUTS / OUTPUTS

Cadac CM-SR AES3 digital I/O section — 8 AES3 inputs with SRC and 8 AES3 outputs on XLR connectors

  • 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

2.4" MENU SCREEN

Cadac CM-SR feature 2.4-inch colour menu display showing analogue, AES and headphone monitoring controls

  • 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 rotary / 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.

MegaCOMMS

Cadac CM-SR MegaCOMMS ports — BNC and duplex optical LC connections carrying 128 channels of 96kHz audio up to 2000 metres

  • 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.

DUAL INTERNAL PSUs

Cadac CM-SR stage rack rear panel showing dual internal redundant PSUs for mission-critical live sound applications

  • 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.

​

Gallery

Cadac CM-SR24 remote stage rack — 4U, 16 analogue inputs, 24 analogue outputs, MegaCOMMS connectivit
Cadac CM-SR64 remote stage rack — 7U, 56 analogue inputs, 32 analogue outputs, MegaCOMMS connectivit
Cadac CM-SR40 remote stage rack — 4U, 32 analogue inputs, 8 analogue outputs, MegaCOMMS connectivity
Cadac CM-SR64 remote stage rack — 7U, 56 analogue inputs, 32 analogue outputs, MegaCOMMS connectivit
Cadac CM-SR stage rack rear panel showing dual internal redundant PSUs for mission-critical applicat

Specification

General Specification

SCREEN

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

CM-SR24 I/O

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

CM-SR40 I/O

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

CM-SR64 I/O

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

XLR

Neutrik connectors

Tolerant of 48 V connection and short circuit protected

Headphone Amp

¼ “(6.35mm) 3-pole (TRS)

With attenuator

MegaCOMMS

2 x Cadac MegaCOMMS on:

4 x BNC connectors

2 x duplex optical LC ports (requires Transceiver Cartridge)

PSU

2 x internal PSUs

100-240V AC 50-60 Hz

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

DIMENSIONS

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

WEIGHTS

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

SAMPLE RATE

96 kHz

PROCESSING DELAY

Sub 0.4 millisecond latency through complete signal chain

INTERNAL PROCESSING

40-bit floating point

ADC/DAC

24-bit

FREQUENCY RESPONSE

10 Hz to 44 kHz + 0.5 / -0.5 dB

THD+N

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

CHANNEL SEPARATION

better than 95 dB

RESIDUAL OUTPUT NOISE

< -95 dBu (10 Hz – 44 kHz)

MIC EIN

< -127 dB with 200 Ohm source impedance

MAXIMUM OUTPUT

21 dBu

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