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

Sonifex RB-HD1

The Sonifex 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.

Sonifex RB-HD1 Specifications

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   

Connections

• 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)      

Physical Specification

• Dimensions:
  
  • 48cm (W) x 10.8cm (D) x 4.2cm (H) (1U)
  • 19” (W) x 4.3” (D) x 1.7” (H) (1U)
• Weight: 
  
  • Nett: 1.35kg Gross: 2.0kg
  • Nett: 3lbs Gross: 4.4lbs