Sonifex RB-HD1 - Stereo Headphone Amplifier (1U)

Product Code: RB-HD1
Condition: Used
  • £249.95
  • (£299.94 inc. VAT)
  • RRP £249.95
Item in Stock | Usually dispatched within 24 hours

The RB-HD1 is a 1U rack-mount stereo headphone amplifier for driving up to two pairs of professional stereo headphones from a single stereo or mono input. One headphone socket is on the front panel with one on the rear. The main stereo input uses electronically balanced XLR-3 connectors on the rear panel, which can be wired un-balanced. The output volume for the headphones can be controlled either by a pot situated on the front panel or a VCA signal supplied externally via the remote connector.

A mono input can be mixed into the main headphone feed, for example, for mixing in talkback to the headphones. This has an input level control via a recessed adjustable potentiometer. The mono mix input can also be controlled remotely. A stereo/mono switch is recessed on the rear panel to prevent accidental knocking. With mono selected, audio is sent to both left and right ear pieces. A LED power indicator on the front panel displays the power supply connection.

RB-HD1 Diagram

Audio Specification

Input impedance:>20kΩ balanced bridging (main)
Output Level:Drives 150mW into 32Ω to 600Ω headphones
Mono Mix Input Gain Range:22dBu
Max Input Level:+28dBu
Volume Control:-80dB to +11dB gain


Main Stereo Inputs:2 x XLR 3 pin female (balanced, can be unbalanced)
Mono Mix Input:1 x XLR 3 pin female (balanced, can be unbalanced)
Outputs:2 x ¼” (6.35mm) A-gauge 3-pole stereo jack sockets
Remote Control:9-pin D-type socket
Mains Input:Filtered IEC, switchable 110-120V, or 220-240V, fused, 9W max
Fuse Rating:Anti-surge fuse 100mA 20 x 5mm (230VAC)
Anti-surge fuse 250mA 20 x 5mm (115VAC)

Equipment Type

RB-HD1:Stereo headphone amplifier

Physical Specification

Dimensions (Raw):48cm (W) x 10.8cm (D) x 4.2cm (H) (1U)
19” (W) x 4.3” (D) x 1.7” (H) (1U)
Dimensions (Boxed):53cm (W) x 20.5cm (D) x 6cm
21” (W) x 8” (D) x 2.4”
Weight:Nett: 1.35kg Gross: 2.0kg
Nett: 3lbs     Gross: 4.4lbs
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