Handbook

48
Redbox User Handbook No 2
12
HEADPHONE DISTRIBUTION AMPLIFIERS - RB-HD6
Master Level Control
The master level control will set the maximum level of all channels and will need to be
set high if an unbalanced consumer input level (-10dbu) is used. This level control can
be disabled by setting jumpers within the unit. See Page 46 for details on removing
the equipment covers. The two jumpers JP25 and JP26 can be found near the volume
potentiometer VR1 :
Jumper JP25 JP26
Enable Master Level Control On On
Disable Master Level Control O O
Fig 12-7: RB-HD6 Master Level Control.
Channel Volume Controls
Each channel has its own volume control so that you have control of the signal volume to an
individual output whether it is from the master input or the override input.
Technical Specications
Audio Specications
Input Impedance: >20kΩ balanced bridging (main),
>10kΩ unbalanced (insert points)
Maximum Input Level: +28dBu
Output Level: Drives 150 mW into 32Ω to 600Ω headphones
Override Inputs: +3dBu for full volume at +18dB gain
Individual Volume Control: -60dB to +18dB gain
Master Volume Control: ±10dB gain
Connections
Main Stereo Inputs: 2 x XLR 3 pin female (Balanced, can be wired unbalanced
Insert Inputs & 6 x ¼” (6.35mm) A-gauge 3-pole stereo jack sockets
Parallel Outputs: (unbalanced, jumper congured)
Outputs: 6 x ¼” (6.35mm) A-gauge 3-pole stereo jack sockets
Mains Input: Filtered IEC, 110V-120V, or 220-240V switchable, fused,
9W maximum
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 amplier
Physical Specications
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 (H)
21” (W) x 8” (D) x 2.4” (H)
Weight: Nett: 1.35kg Gross: 2.0kg
Nett: 3lbs Gross: 4.4lbs
HEADPHONE DISTRIBUTION
AMPLIFIERS