Sonifex RB-HD2 Dual Stereo Headphone Amplifier
The Sonifex 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 pre-set controls on the rear panel that adjust the level of the master input signal to the outputs. Each output is on a ¼” stereo jack socket and is designed to drive 150mW 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.
RB-HD2 Block Diagram.
Technical Specification For RB-HD2 |
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Audio Specification |
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| Input impedance: | >20kΩ balanced bridging (main) |
| Max Input Level: | +28dBu |
| Input Gain Range: | -12dB to +20dB gain (pre-set pots) |
| Output Level: | Drives 150mW into 32Ω to 600Ω headphones |
| Volume Controls: | -80dB to +11dB gain |
Connections |
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| Main Stereo Inputs: | 2 x XLR 3 pin female (balanced, can be unbalanced) |
| Outputs: | 2 x ¼” (6.35mm) A-gauge 3-pole stereo jack sockets |
| 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 |
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| RB-HD2: | Dual stereo headphone amplifier |
Physical Specification |
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| 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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