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

All models are housed in red-anodised aluminium cases with apertures for fixing screws, they can be attached to any flat surface, or rack-mounted from the front with the standard front panels, or in reverse, with the rear panel facing out of the rack, using accessory panels.

RB-HD1 Headphone Amplifier – One Output

A rack-mounting stereo headphone amplifier for driving up to two pairs (in parallel) of professional stereo headphones from a single stereo or mono input. An additional mono input (for example, talkback) can be mixed into the main headphone feed. The level of the headphone outputs may be controlled by local or remote controls and the mono input can be switched on and off remotely.

The front panel has a power LED, a 6.35mm stereo headphone socket, and a volume control. This controls the level of the signal sent to both headphone sockets.

The main stereo input is from electronically balanced XLR-3 connectors on the rear panel, which can be wired un-balanced. Mono or stereo operation may be selected by an adjacent switch. The mono input is also an XLR, and has a screwdriver-operated local level control. A 6.35mm, A-gauge, stereo socket provides the second headphone outlet. It is connected in parallel with the connector on the front. A 9-pin D-sub connector provides access to the remote control ports; a switch selects local or remote operation. Power is connected to an IEC inlet. The red-anodised case has apertures for fixing screws to mount the unit to a flat surface, such as the underside of studio furniture.

Main inputs: +28dBu maximum, 20 kohms, balanced. Mono input: 20kohms, balanced. Output: 150mW into 32 to 600 ohm headphones. Volume control: -80dB to +11dB gain. Power source: 110-120V or 220-240V AC, 9W maximum. Dimensions: 1U, 108mm deep. Weight: 1.6kg.

Included accessories: Handbook, AC power cordset with plug.
Optional accessories: The RB=RK2 (1U) rear-panel kit allows the device to be rack-mounted in reverse. The RB-FR2 front-panel kit allows the device to be used without rack-mounting ears.

 

 

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)

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

Audio Specification

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

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

RB-HD2: Dual 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

Audio Specification

Input impedance: >20kΩ balanced bridging, >10kΩ unbalanced override
Output Level: Drives 150mW into 32Ω to 600Ω headphones
Individual Volume Control: -60dB to +18dB gain
Max Input Level: +28dBu
Override Inputs: +3dBu for full volume at +18dB gain
Master Vol Control: ±10dB gain

Connections

Main Stereo Inputs: 2 x XLR 3 pin female (balanced, can be unbalanced)
Insert Inputs/Parallel Outputs: 6 x ¼” (6.35mm) A-gauge 3-pole stereo jack sockets (unbalanced)
Outputs: 6 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

RB-HD6: 6 way stereo headphone distribution 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): 58.5cm (W) x 22.5cm (D) x 7cm (H) 23” (W) x 8.9” (D) x 2.8” (H)
Weight: Nett: 1.35kg Gross: 2.0kg Nett: 3lbs     Gross: 4.4lbs

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