Sonifex RB-DS2
Stereo Delay Synchronizer & Time-Zone Delay


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The Sonifex RB-DS2 is a stereo audio delay synchronizer used for resynchronizing audio to video following delay processes such as standards conversion, transmission delay, logo insertion, video aspect ratio conversion and network delays. It can be used for fixed installations to correct a permanent audio delay, or on an intermittent basis to provide occasional correction, for example for live links. Accepting digital audio signals up to 96kHz, 24 bit, the sonic quality of the RB-DS2 is superb and silent switching is used to provide the smoothest, cleanest audio delay available.

The RB-DS2 has both balanced analog and AES/EBU digital audio inputs and outputs on 3-pin XLR connectors. It can act as a combined A/D and D/A unit meaning that analog inputs can be delayed and output as AES/EBU or vice-versa. It is a stereo delay, but can also be used as a dual mono delay, to process each audio path separately, or as a mono delay only.

As standard the RB-DS2 can provide up to 10.5 seconds of delay at 96kHz sampling, 24 bit (42 secs at 48kHz, 16 bit). An internal Compact Flash™ expansion allows up to 2GB of memory to be accessed providing delay times of over 4 hours, for example, to delay a program output across different time-zones, or to shift a broadcast program by 1 hour for a satellite rebroadcast. Delay times can be selected in samples, fields, frames, metres, milliseconds and with the Compact Flash™ expansion, in hh:mm:ss. Frame and field definitions can be for PAL (25 frame) or NTSC (30 frame) signals.

A front panel blue vacuum fluorescent display with rotary controller is used for selecting the various settings of the delay, which include the source (analog or digital), channels, sample rate, sample bit width, format (PAL or NTSC), delay units and the delay itself. Additionally, input peak digits can be selected from +12dBu, +18dBu and +24dBu for FSD and two left and right pre-set potentiometers on the rear panel allow the input gain range to be altered by ±3dB around the selected peak digits.

The analog output gain range can be altered in software from -6dBu to +24dBu output level, ref FSD. Both analog and digital outputs can be separately muted and a front panel Bypass button disengages electro-mechanical relays to divert both analog and digital inputs to their outputs. This is also disengaged automatically when a power-fail occurs.

All of the settings in the unit can be saved to one of 8 configuration settings. These Configs can be viewed, edited, saved and loaded, and also remotely loaded by using one of the 8 GPI contacts, meaning that any setting, such as delay time or Bypass, can be altered instantaneously using a GPI signal. The RB-DS2 also has an RS232 serial port for remotely controlling the unit and there are 4 remote outputs which can be used for signalling. The front panel controls can be locked-out for situations where remote control is being used to run the unit, or where physical security is required.

This product has settings that can be adjusted using the Sonifex SCi (Serial Control Interface) software. To download a copy of the SCi software, please visit the Sonifex website.

Sonifex RB-DS2 Specifications:

  • A/D:
    • Maximum Input Level:  +28dBu
    • Input Impedance:  > 10 kOhm bridging
    • Analog & Digital Input Levels:  Selectable +12dBu, +18dBu, +24dBu for FSD
    • Analog Pre-set Input Gain Range:  Adjustable 3dB loss to 3dB gain (L & R adjust)
    • Signal to Noise:  Better than -101dBFS (RMS A-weighted at 24bit)
    • Dynamic Range:  > 110dB
    • Distortion & Noise:  > 96dB THD + N at 1kHz
  • D/A:
    • Maximum Output Level:  +24dBu
    • Output Impedance:  < 50 Ohms
    • Dynamic Range:  > 100dB
    • Analog Output Gain Range:  Selectable -6dBu to +24dBu output level, ref FSD
    • Sampling Frequency:  Selectable 32kHz, 44.1kHz, 48kHz 64kHz, 88.2kHz or 96kHz,
    • Sample Width:  Selectable 16-bit or 24-bit
    • Channels:  Stereo or dual mono
    • Format (Fields & Frames):  PAL, NTSC
    • Delay Units:  Samples, fields, frames, milliseconds, hh:mm:ss, (with CF expansion)
    • Maximum Delay:  10.5 seconds @ 96kHz, 24bit, stereo (excluding memory expansion)
  • Rear Panel Connections:
    • Analog Inputs:  2x XLR 3-pin female (balanced) (L & R
    • Analog Outputs:  2x XLR 3-pin male (balanced) (L & R)
    • Digital Inputs:  1x AES/EBU XLR 3 pin female
    • Digital Outputs:  1x AES/EBU XLR 3 pin male
    • Remote I/O Port:  15-way ‘D’-type plug, 8 GPI inputs, 4 GPI outputs
    • Serial Comms Port:  9-way ‘D’-type plug
    • Memory Expansion:  Internal Compact Flash™ storage card supporting up to 2GB. CF cards must be PIO Type 4 or higher.
    • Mains Input:  Filtered IEC, continuously rated 85-264 VAC, 47-63Hz, fused, 60W peak, 30W average
    • Fuse Rating:  Anti-surge fuse 2A 20 x 5mm
  • Front Panel Controls:
    • Display:  Vacuum fluorescent display
    • System Navigation:  Rotary selector with integral push-switch
    • Audio Bypass:  Via push-button
  • Physical Specifications:
    • Dimensions:
      • Unit: 19" W x 6.2" D x 1.7" H (1RU) (48 x 15.8 x 4.2 cm)
        This product is deeper than standard Redboxes
      • Boxed: 23.2" W x 10.8" D x 4.3" H (59 x 27.5 x 11 cm)
    • Weight:
      • Net: 3.5 lbs (1.6 kg)
      • Gross: 4.8 lbs (2.3kg)
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