Sonifex RM-4C8-E1B - Reference Monitor RM-4C8 With RM-E1B Dolby Decoder Card
  • Sonifex RM-4C8-E1B - Reference Monitor RM-4C8 With RM-E1B Dolby Decoder Card
  • Sonifex RM-4C8-E1B - Reference Monitor RM-4C8 With RM-E1B Dolby Decoder Card
  • Sonifex RM-4C8-E1B - Reference Monitor RM-4C8 With RM-E1B Dolby Decoder Card

Sonifex RM-4C8-E1B - Reference Monitor RM-4C8 With RM-E1B Dolby Decoder Card

Code:RM-4C8-E1B Condition: New
( £4,163.88 inc. VAT)
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This version of the Reference Monitor is the RM-4C8 with the RM-E1B expansion card already fitted. So, it has all of the features of the RM-4C8 as standard together with Dolby Decoding.

The RM-E1B adds to the unit a 75ohm unbalanced AES/EBU input and output on BNC connectors with the output acting as a loop-through of the input. The BNC input can decode a Dolby E or Dolby Digital audio stream allowing you to monitor visually 8 or 5.1 audio channels respectively and to monitor audibly any 2 of those channels.


By pressing the left hand source select control, you can select the Dolby input. If a Dolby E or Dolby Digital input is detected, the Channels (CHANS) button flashes to indicate that decoding is possible. Pressing the CHANS button displays the Dolby Digital 5.1 or Dolby E 8 channel signal, using the 4 bar-graph meters.


Each meter is split into 2 sections allowing you to view L, R, C, LFE, Ls, Rs for Dolby Digital and an additional Lt, Rt for Dolby E.

Full Dolby Metadata is available using the SCi remote control software. For a more detailed description of Dolby Decoding operation please refer to the Reference Monitor handbook.


Audio Inputs 8 analogue or AES/ EBU digital channels (autoselecting)
Max level (0dB input gain): +18dBu (analogue)/0dBFS (digital)
CMRR: >60dB typical
Input Impedance: 20kΩ (analogue) 110Ω (digital with termination switchable)
AES/EBU Sample Rate: 32 to 192kHz, converted internally to 48kHz
Input Gain: 0, +6, +12 or +18dB digital gain (switchable)
Selection: 2 x Front panel rotary control with indicator LEDs

Dolby Decoding Audio Input

AES/EBU Input 75Ω transformer coupled unbalanced input
Sample Rates: 32 - 48 kHz
Audio Formats: Linear PCM
Dolby E (16, 20 and 24 bit)
Dolby Digital (16 and 32 bit)

Line Level Outputs

Audio Outputs: 1 x stereo analogue or AES/EBU digital (switchable)
Gain re Selected Input: Unity or variable, following volume control (switchable)
Maximum Output Level: +18dBu (analogue)/0dBFS (digital)
Output Impedance: <50Ω (analogue)/110Ω (digital)
AES/EBU Sample Rate: 48kHz
Distortion: <0.02% (1kHz, +8dBu output)
Noise: -84dB RMS, unity gain ref +8dBu output
Frequency Response: 20Hz-20kHz +0/-0.5dB
1kHz input:
10kHz input:
Analogue I/O, ref 0dBu

Dolby Follow Audio Output

AES/EBU Output 75Ω transformer coupled unbalanced output

Audio Modifiers

Modifier Selection: Illuminated front panel pushbuttons
DIM: Reduces speaker audio level by 10dB
CUT L & CUT R: Mutes left/right speaker audio
MONO: Combines left and right audio inputs
PHASE INVERT: Inverts phase of right audio input
M+S: Converts stereo input to Middle (sum) and Side (difference) signals

User-Variable Equalisation

Type: Parametric
Bands: Five
Centre Frequency: 200Hz to 18kHz
Bandwidth: 0.25 to 2 octaves
Boost/Cut: ±12dB
Programming: Via USB/serial control port


Configuration: Three-way with stereo mid/ high-frequency drivers & mono low-frequency driver
Power Output: 2 x 5W (HF) + 20W (LF) with protective limiter
Crossover: 500Hz (3rd order Butterworth)
Distortion (HF Outputs): < 0.05% (1kHz, 3W output)
Distortion (LF Output): < 0.05% (100Hz, 6W output)
Noise: More than 80dB below full output
Volume: Mute to full volume via front panel rotary control
Balance Trim: ±6dB via front panel rotary control
Peak Acoustic Level: 102dB SPL @ 2ft

Level Metering

Number: 4 x 26-segment tri-colour LED bargraphs
Characteristics: Selectable by switch from:
1. Dual BBC PPM + standard VU
4. Nordic PPM
5. AES/EBU digital PPM
7. Standard VU
8. Extended VU
Ballistics: According to selected characteristic
Line-Up Level: According to selected characteristic

Phase Metering

Type: 5-segment, indication at 0, 45, 90, 135 and 180 degrees

Remote Control

USB: Slave device, 19200 baud
Serial: RS232, 19200 baud, 3-wire connection
Alarm Outputs: 1. Audio underlevel/fail (latching)
2. Audio overlevel (latching)
3. Sustained phase error (latching)
4. AES/EBU input unlock (non-latching) Open-collector outputs rated at 30V,
50mA maximum
Output low/conducting in normal condition (no alarm)
Control Inputs: 1. Mute audio
2. Dim audio
3. Alarm reset
Pull-to-ground to activate inputs

Status Indicators

LIMIT: Indicates loudspeaker protection limiter is active.
CLIP: Indicates internal digital clipping due to overlevel.
LOCK: Indicates lock achieved on selected digital input(s).
OPT: For future use.


Audio Inputs: 8 x XLR 3-pin female (balanced, may be unbalanced)
Audio Outputs: 2 x XLR 3-pin male (balanced, may be unbalanced)
AES/EBU Input: 1 x BNC
AES/EBU Output: 1 x BNC
Headphones: 1/4” (6.35mm) A-gauge 3-pole stereo jack socket
USB: Type B socket
Serial: D-sub 9-pin female
Remote I/O: D-sub 15-pin male
Mains Input: Filtered 3-pin IEC male, continuously rated 85 - 264VAC, 47 - 63Hz, fused, 60W peak, 30W average
Fuse Rating: Anti-surge fuse 2A 20 x 5mm

Equipment Type

RM-4C8: Reference Monitor, 4 LED meters, 8 channel inputs & dual source selectors

Physical Specification

Dimensions (Raw): 48cm (W) x 30.5cm (D) x 4.4cm (H) (1U)
19” (W) x 12” (D) x 1.73” (H) (1U)
Dimensions (Boxed): 57cm (W) x 52cm (D) x15cm (H)
22.4” (W) x 20.5” (D) x 5.9” (H)
Weight: Nett: 4.5kg Gross: 6kg
Nett: 10lb   Gross: 13.2lb


RM-HD1: 3G/HD/SD-SDI expansion card
RM-HDE1: 3G/HD/SD-SDI & Dolby® E expansion card

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