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Sonifex RM-4C8-HDE1 - Reference Monitor RM-4C8 with RM-HDE1 Dolby Decoder Card

£4,098.00 £3,415.00 (ex. vat)

Sonifex RM-4C8-HDE1

  • Sonifex RM-4C8-HDE1
  • Sonifex RM-4C8-HDE1
  • Sonifex RM-4C8-HDE1 Rear

Sonifex RM-4C8-HDE1 - Reference Monitor RM-4C8 with RM-HDE1 Dolby Decoder Card

The Sonifex RM-4C8-HDE1 is a version of the RM-4C8 Reference Monitor with the RM-HDE1 expansion card already fitted. So, it has all of the features of the RM-4C8 as standard together with the ability to de-embed audio from an SDI stream and then decode a Dolby digital audio signal from that de-embedded audio.

The RM-HDE1 adds to the unit a 75ohm 3G/HD/SD-SDI input and output on BNC connectors with the output acting as a loop-through of the input. The monitor can take a 3G/HD/SD-SDI input and de-embed audio from any selected audio group, with left and right speakers being able to monitor any 2 channels within that group. The 4 channels in a group are shown on the 4 bar-graph meters. If a Dolby E or Dolby Digital input is detected on the selected input, 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.

With full remote control via GPI, RS232 or USB, a 5 band parametric equaliser, 6 front panel modifier buttons and the ability to take the optional 3G/HD/SD-SDI expansion cards, the RM-4C8 is a flexible and versatile monitoring solution.

The same high level of care has been taken in the design of the RM-4C8 as in the RM-2S4 to ensure that it will be the best sounding 1U rack-mount audio monitor that you listen to.

Sonifex RM-4C8-HDE1 Specifications

Audio Inputs

  • 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 

SDI Specification

  • SDI Input: 1 x BNC, 3G/HD/SD-SDI
  • SDI Outputs: 1 x BNC, 3G/HD/SD-SDI, Re-clocked
  • Impedance: 75Ω
  • Output Alignment Jitter: <0.2UI
  • Output Level: 800mV +/- 10%
  • Return Loss: <15dB at 1500MHz
  • SDI Supported Standards:
    • 270Mbps, SMPTE-259M-C (SD)
    • 1.485 or 1.4835Gbps, SMPTE-292M (HD)
    • 2.97 or 2.967Gbps, SMPTE-424M (3G)
  • Supported Video Formats:
    • 525/59.94 (SMPTE-125M)
    • 625/50 (ITU-R BT.656)
    • 720p/23.98, 24, 25, 29.97, 30, 50, 59.94, 60 (SMPTE-296M) 
    • 1035i/59.94, 60 (SMPTE-260M)
    • 1080i/50, 59.94, 60 (SMPTE-274M) 
    • 1080p/23.98, 24, 25, 50, 59.94, 60 (SMPTE-274M) 
    • 1080pSF/23.98, 24, 25, 29.97, 30 (RP-211) 
    • 1080i/50 (SMPTE-295M)
    • 1080p/50 (SMPTE-295M)
  • Embedded Audio:
    • 48kHz, synchronous (HD asynchronous)
    • SMPTE-272M-ABC
    • SMPTE-299M

 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
  • Crosstalk: Analogue I/O, ref 0dBu
    • 1kHz input: <-90dB
    • 10kHz input: <-85dB   

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 
    • 2. BBC PPM 
    • 3. EBU PPM 
    • 4. Nordic PPM 
    • 5. AES/EBU digital PPM 
    • 6. DIN 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)
  • HD-SDI Input: 1 x BNC 75Ω HD-SDI input
  • HD-SDI Output: 1 x BNC 75Ω HD-SDI output (reclocked loop through)
  • 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-HDE1: 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
Manufacturer Sonifex
Model Sonifex RM-4C8-HDE1
Sonifex RM-4C8-HDE1
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Studiocare Professional Audio Ltd.

Unit 2, 56 Evans Road


L24 9PB

+44 (0) 151 707 4545
+44 (0) 845 345 8910

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