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Sonifex RB-HD1

Stereo Headphone Amplifiers

The Sonifex RB-HD1  range of stereo headphone amplifiers accept balanced-line signals and provide one, two or six separate outputs to drive professional headphones.

SKU: 101566

Original price was: €420.Current price is: €395.


Sonifex RB-HD1

Stereo Headphone Amplifier

Broadcasters Warehouse -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 unbalanced. 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 earpieces. A LED power indicator on the front panel displays the power supply connection.

RB-HD1 Diagram

RB-HD1 Block Diagram.

Technical Specification For RB-HD1

Audio Specification

Input impedance: >20kΩ balanced bridging (main)
Output Level: Drives 150mW into 32 Ω to 600 Ω 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” (6.35 mm) 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 × 5 mm (230VAC)
Anti-surge fuse 250mA 20 × 5 mm (115VAC)

Equipment Type

RB-HD1: Stereo headphone amplifier

Physical Specification

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