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 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 Block Diagram.
Specification for Sonifex RB-HD1 |
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Audio Specification |
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| 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 |
Connections |
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| 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 |
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| RB-HD1: | Stereo headphone amplifier |
Physical Specification |
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| 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 |
