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Sonifex RB-HD2 Dual Stereo Headphone Amplifier
The RB-HD2
The RB-HD2
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The RB-HD2 is a high performance 2-way stereo headphone distribution amplifier for driving up to 2 pairs of professional stereo headphones from a single stereo or mono input. A switch on the rear panel enables the distribution of a mono signal to all four outputs (i.e. both earpieces of a pair of stereo headphones) via the left channel input. The stereo/mono switch is located on the rear panel to prevent accidental knocking.

The XLR-3 inputs are electronically balanced and can be wired unbalanced. There are two preset controls on the rear panel that adjust the level of the master input signal to the outputs.

Each output is on a 1/4" stereo jack socket and is designed to drive 150 mW into 32 ohm to 600 ohm stereo headphones. The outputs are individually buffered with their own front panel volume control.

A LED power indicator on the front panel displays the power supply connection.

  Audio Specification
Maximum Input Level+28dBu
Input Impedance>20kohm balanced bridging (main), 10kohm unbal override
Output LevelDrives 150mW into 32-600ohm headphones
Volume Control-60dB to +18dB gain
Input Gain Range-12dB to +20dB gain (preset pots)
  Connections
Main Stereo Inputs2 x XLR 3 pin female (balanced, can be unbalanced)
Outputs2 x 0.25" (6.3mm) A/B gauge 3-pole stereo jack sockets
Remote Control9-pin D-type socket
Mains InputFiltered IEC, switchable 110-120V, or 220-240V, fused, 9W max
  Physical Specification
WeightNett: 1.35kg
Gross: 2.0kg
DimensionsRaw: 48cm (W) x 10.8cm (D) x 4.2cm (H) (1U)
Boxed: 53cm (W) x 20.5cm (D) x 6cm (H)

  Equipment Type
  Code  DescriptionPlug
RB-HD2 UKDual Stereo Headphone Amplifier, 230V (UK 3 pin to IEC)UK
RB-HD2 EUDual Stereo Headphone Amplifier, 230V (European Schuko 2 pin to IEC)EU
RB-HD2 USDual Stereo Headphone Amplifier, 115V (USA 3 pin to IEC)US
RB-HD2 AUDual Stereo Headphone Amplifier, 230V (Australasian 3 pin to IEC)AU

  Accessories for this Product
  Code  Description 
RB-RK21U rear panel rackmount kit for small RedboxRK2
RB-FR3Front panel kit without rack mountingFR3


Sonifex Ltd. 61 Station Road, Irthlingborough, Northants, NN9 5QE, UK.
Tel: +44 (0)1933 650700 Fax: +44 (0)1933 650726 EMail: sales@sonifex.co.uk