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See also:
User Handbook Manual
Redbox
User Handbook
Matching Converters, Distribution
Amplifiers & Headphone Amplifiers
RB-UL1
Single stereo unbalanced to balanced converter
RB-UL2
Dual stereo unbalanced to balanced converter
RB-UL4
Quad stereo unbalanced to balanced converter
RB-LU4
Quad stereo balanced to unbalanced converter
RB-BL2
Single stereo bi-directional matching converter
RB-BL4
Dual stereo bi-directional matching converter
RB-PA2
Dual stereo RIAA phono amplifier
RB-LI2
Stereo line isolation unit
RB-PLI6
6 way mono passive line isolation unit
RB-DA6
6 way stereo distribution amplifier
RB-DA6G
6 way stereo distribution amplifier with output
gain control
RB-DA4x5
4 input, 4 x 5 output distribution amplifier/mixer
RB-DDA6A
6 way stereo AES/EBU digital distribution amplifier
RB-DDA6S
6 way stereo S/PDIF digital distribution amplifier
RB-DDA6W
6 way word clock digital distribution amplifier
RB-HD1
Stereo headphone amplifier
RB-HD2
Dual stereo headphone amplifier
RB-HD6
6 way stereo headphone distribution amplifier
RB-DHD6
Digital 6 way stereo headphone distribution amplifier
No 2
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Table of Contents
Related Manuals for Sonifex Redbox RB Series
Summary of Contents for Sonifex Redbox RB Series
- Page 1 Redbox User Handbook No 2 Matching Converters, Distribution Amplifiers & Headphone Amplifiers RB-UL1 Single stereo unbalanced to balanced converter RB-UL2 Dual stereo unbalanced to balanced converter RB-UL4 Quad stereo unbalanced to balanced converter RB-LU4 Quad stereo balanced to unbalanced converter RB-BL2 Single stereo bi-directional matching converter RB-BL4...
- Page 2 Information in this document is subject to change without notice and does not represent a commitment on the part of Sonifex Ltd. Sonifex Ltd shall not be liable for any loss or damage whatsoever arising form the use of information or any error contained in this manual.
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Page 3: Table Of Contents
Power Cable and Connection Ordering the Correct Mains Lead Installation Information Atmosphere Electromagnetic Radiation Fitting Redboxes WEEE & RoHS Directives - Sonifex Statement MATCHING CONVERTERS 1 RB-UL1 Single, RB-UL2 Dual & RB-UL4 Quad Stereo Unbalanced To Balanced Converters Introduction System Block Diagram... - Page 4 CON TE NTS 4 RB-PA2 Dual Stereo RIAA Phono Amplifier Introduction System Block Diagram Rear Panel Connections and Operation RCA Phono Inputs (Left and Right) Outputs (Left and Right) Output Level Adjustment Pick-up Grounding Post Technical Specifications 5 RB-LI2 Stereo Line Isolation Unit Introduction System Block Diagram Rear Panel Connections and Operation...
- Page 5 CON T EN TS 9 RB-DDA6A 6 Way Stereo AES/EBU Digital Distribution Amplifier and RB-DDA6S 6 Way Stereo S/PDIF Digital Distribution Amplifier Introduction System Block Diagrams 31-32 Rear Panel Connections and Operations AES/EBU Input AES/EBU Outputs S/PDIF Input S/PDIF Outputs Technical Specifications 10 RB-DDA6W 6 Way Word Clock Distribution Amplifier Introduction...
- Page 6 CON TE NTS 13 RB-DHD6 Digital 6 Way Headphone Distribution Amplifier Introduction System Block Diagram Front Panel Indicators & Controls Sync & Power Indicator Headphone Outputs Volume Control Rear Panel Connections and Operation AES/EBU Input S/PDIF Input Status Select Switches Digital Input Select Button Technical Specifications 14 Connectors &...
- Page 7 FI G U RE S Figures Fig A: Packing List. Fig B: Mains Cable Wire Colours Fig C: Mains Lead Table. Fig D: RB-RK1Small Redbox Front Rack-mount Kit . Fig E: RB-RK2 Small Redbox Rear Rack-mount Kit. Fig F: RB-RK3 Large Redbox Rear Rack-mount Kit. Fig 1-1: RB-UL1 &...
- Page 8 F IG UR ES Fig 8-5: RB-DA4x5 Pinout for Audio Output Group Connector. Fig 8-6: RB-DA4x5 Routing Selection Switch. Fig 8-7: RB-DA4x5 Routing Selection Switch Functions. Fig 9-1: RB-DDA6A/S Front Panel. Fig 9-2: RB-DDA6A System Block Diagram. Fig 9-3: RB-DDA6S System Block Diagram. Fig 9-4: RB-DDA6A Rear Panel.
- Page 9 WARR AN T Y Warranty Warranty and Liability - important the purchaser is advised to read this clause The Company agrees to repair or (at its discretion) replace Goods which are found to be defective (fair wear and tear excepted) and which are returned to the Company within 12 months of the date of despatch provided that each of the following are satisfied: Notification of any defect is given to the Company immediately upon its...
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Page 10: Warranty
WAR R A NT Y (ii) For any breach by the Company of any statutory undertaking as to title, quiet possession and freedom from encumbrance. Subject to conditions (a) and (c) from the time of despatch of the Goods from the Company’s premises the Purchaser shall be responsible for any defect in the Goods or loss, damage, nuisance or interference whatsoever consequential economic or otherwise or wastage of material resulting from or caused by or to the Goods. -
Page 11: Returning The Warranty Card
In order to register the date of purchase so that we can keep you informed of any design improvements or modifications, it is important to complete the warranty registration document that is enclosed and return it to Sonifex Ltd in the UK, or register online at www.sonifex.co.uk/register For your own records you should write down the serial number (which can be found on the rear of the Redbox. -
Page 12: Power Cable And Connection
Fig B: Mains Cable Wire Colours Ordering the Correct Mains Lead When ordering a Redbox from Sonifex, it is helpful if you can specify your required operating voltage and mains lead. After the product code add: UK, for 230V, UK 3 pin to IEC lead... -
Page 13: Fig D: Rb-Rk1Small Redbox Front Rack-Mount Kit
S A F E T Y & I N S TA L L AT I O N INFORMATION They can also be rack-mounted, with either the front, or rear of the Redbox positioned at the front of the rack: Front Mounting Redboxes: For rack mounting smaller (28cm) units the optional RB-RK1 (Red) or RB-RK1B (Black) kit can be used (which include 4 off M6 panel fixing screws). -
Page 14: Weee & Rohs Directives - Sonifex Statement
It gives a contact for individuals who are unsure about the correct procedure when the product has reached its “end of use”. Sonifex Ltd will be happy to give you information about local organisations that can reprocess the products, or alternatively all products that have reached “end of use” can be returned to Sonifex and will be reprocessed correctly free of charge. -
Page 15: Matching Converters
MATCHING CONVERTERS 1 RB-UL1 Single, RB-UL2 Dual & RB-UL4 Quad Stereo Unbalanced To Balanced Converters Introduction Fig 1-1: RB-UL1 & RB-UL2 Front Panel. Fig 1-2: RB-UL4 Front Panel. The RB-UL1 single, RB-UL2 dual & RB-UL4 quad stereo units are used for interfacing domestic, or semi-pro unbalanced equipment to professional balanced line levels. -
Page 16: Rear Panel Connections And Operation
MATCHING CONVERTERS Rear Panel Connections and Operation Stereo Phono Outputs Inputs Output Level Adjustment Fig 1-4: RB-UL1 Rear Panel. Output Level Adjustment Stereo Balanced Phono Outputs Inputs Fig 1-5: RB-UL2 Rear Panel. Output Phono Level Inputs Adjustment Stereo Balanced Outputs Fig 1-6: RB-UL4 Rear Panel. -
Page 17: Rca Phono Inputs (Left And Right)
MATCHING CONVERTERS RCA Phono Inputs (Left and Right) The stereo left and right RCA inputs are unbalanced and have an impedance of 10kΩ. They are routed to the stereo balanced XLR 3 pin output connectors. Outputs (Left and Right) The XLR 3 pin output plug connectors are electronically balanced with an output impedance of <50Ω. -
Page 18: Rb-Ul4
MATCHING CONVERTERS Technical Specifications Audio Specifications Maximum Input Level: +28dBu Input Impedance: >10kΩ Output Impedance: <50Ω Maximum Output Level: +28dBu Distortion: 0.01% THD @ 1kHz ref +8dB output Noise: -100dB unity gain, ref +8dB output Common Mode Rejection: >66dB typically Frequency Response: 20Hz to 20kHz ±0.1dB (600Ω... -
Page 19: Rb-Lu4 Quad Stereo Balanced To Unbalanced Converter
MATCHING CONVERTERS 2 RB-LU4 Quad Stereo Balanced To Unbalanced Converter Introduction Fig 2-1: RB-LU4 Front Panel. The RB-LU4 is a quad stereo unit for interfacing professional balanced equipment to domestic, or semi-pro unbalanced line levels. All connections are on the rear panel. The eight XLR-3 electronically balanced inputs have an impedance of 20kΩ... -
Page 20: System Block Diagram
MATCHING CONVERTERS System Block Diagram Phono Left Input 1 Left Output 1 Professional/ Consumer/Unbalanced Balanced Gain Phono Right Input 1 Right Output 1 Professional/ Consumer/Unbalanced Balanced Gain Phono Left Input 2 Left Output 2 Professional/ Consumer/Unbalanced Balanced Gain Phono Right Input 2 Right Output 2 Professional/ Consumer/Unbalanced... -
Page 21: Inputs 1-4 (Left And Right)
MATCHING CONVERTERS Rear Panel Connections and Operation Phono Outputs Stereo Balanced Output Inputs Level Adjustment Fig 2-3: RB-LU4 Rear Panel. Inputs 1-4 (Left and Right) The XLR 3 pin sockets used for the left and right channel inputs of Input 1 are electronically balanced and have an impedance of 20kΩ... -
Page 22: Technical Specifications
MATCHING CONVERTERS Technical Specifications Audio Specifications Maximum Input Level: +28dBu Input Impedance (XLR): >20kΩ balanced bridging Output Impedance (RCA) : <50Ω Maximum Output Level: +22dBu Distortion: 0.01% THD @ 1kHz, ref +8dBu output Noise: -100dB, unity gain, ref +8dBu output Common Mode Rejection: >66dB typically Frequency Response:... -
Page 23: Rb-Bl2 Single & Rb-Bl4 Dual Bi-Directional Matching Converter
MATCHING CONVERTERS 3 RB-BL2 Single & RB-BL4 Dual Bi-Directional Matching Converter Introduction Fig 3-1: RB-BL2 Front Panel. Fig 3-2: RB-BL4 Front Panel. The RB-BL2 is a bi-directional stereo unit for interfacing domestic, or semi-pro unbalanced equipment to professional balanced line levels, and vice-versa. The RB-BL4 has dual bi- directional stereo capability. -
Page 24: Fig 3-3: Rb-Bl2/Bl4 Block Diagram Single Stereo Channel
MATCHING CONVERTERS System Block Diagram Phono Left Input 1 Left Output 1 Professional/ Consumer/Unbalanced Balanced Gain Phono Right Input 1 Right Output 1 Professional/ Consumer/Unbalanced Balanced Gain Phono Left Input 2 Left Output 2 Consumer/ Professional/Balanced Unbalanced Gain Phono Right Input 2 Right Output 2 Consumer/ Professional/Balanced... -
Page 25: Balanced To Unbalanced Connections
MATCHING CONVERTERS Balanced Balanced Phono Phono Outputs Outputs Outputs Outputs Balanced RCA Phono Balanced RCA Phono Inputs Inputs Inputs Inputs Balanced Output Unbalanced Output Balanced Output LevelControl Level Control Level Control Fig 3-5: RB-BL4 Rear Panel. Balanced to Unbalanced Connections Inputs 1 (&... -
Page 26: Technical Specifications
MATCHING CONVERTERS Technical Specifications Audio Specifications Maximum Input Level: +28dBu Maximum Output Level: +28dBu Input Impedance (RCA) : >10kΩ unbalanced Input Impedance (XLR) : >20kΩ balanced bridging Output Impedance (RCA) : <50Ω Output Impedance (XLR) : <50Ω Distortion: 0.01% THD @ 1kHz, ref +8dBu output Noise: -100dB, unity gain, ref +8dBu output Common Mode Rejection:... -
Page 27: Rb-Pa2 Dual Stereo Riaa Phono Amplifier
MATCHING CONVERTERS 4 RB-PA2 Dual Stereo RIAA Phono Amplifier Introduction Fig 4-1: RB-PA2 Front Panel. The RB-PA2 is a dual stereo RIAA equalised phono amplifier. This record player preamp amplifies the small signal from your pick up cartridge (either moving magnet or high output moving coil magnetic) and provides the necessary RIAA equalisation required for vinyl records, to match it to a line input of your mixer, or amplifier. -
Page 28: Outputs (Left And Right)
MATCHING CONVERTERS Rear Panel Connections and Operation Pick-up Output Pick-up Grounding Level Grounding Post Adjustments Post Stereo Stereo Phono Balanced Phono Balanced Inputs Outputs Inputs Outputs Fig 4-3: RB-PA2 Rear Panel. RCA Phono Inputs (Left and Right) The stereo left and right RCA inputs are unbalanced and have an impedance of 47kΩ. They are routed to the stereo balanced XLR 3 pin output connectors. -
Page 29: Technical Specifications
MATCHING CONVERTERS Technical Specifications Audio Specifications Maximum Input Level: +28dBu Input Impedance: >47kΩ Input Sensitivity Range: 1mV to 25mV (ref 1kHz) Maximum Output Level: +28dBu Output Impedance: <50Ω Output Gain Range: Adjustable 38dB to 58dB gain via 4 multi-turn pots Crosstalk: Better than -80dBu at 1kHz Frequency Response:... -
Page 30: Rb-Li2 Stereo Line Isolation Unit
MATCHING CONVERTERS 5 RB-LI2 Stereo Line Isolation Unit Introduction Fig 5-1: RB-LI2 Front Panel. The RB-LI2 stereo line isolation unit is used to isolate audio signals from inter area ground hum loops, which could be caused by equipment being powered by different mains power supplies, or different phases on the same supply. -
Page 31: Inputs
MATCHING CONVERTERS Rear Panel Connections and Operation Isolated Isolated Output Output Input Input Loop Output Loop Output Output Level Output Level Adjustment Adjustment Fig 5-3: RB-LI2 Rear Panel. Inputs There are 2 input XLR 3 pin sockets. They have the following connections: Pin 1: Screen Pin 2: Phase Pin 3: Non-phase... -
Page 32: Internal Jumpers
MATCHING CONVERTERS Internal Jumpers The unit has jumpers that are used to balance the output about ground. By default these are not fitted when the unit leaves the factory. To get inside the RB-LI2, first ensure that it has been disconnected from the mains power and that the mains IEC lead to the unit has been removed. -
Page 33: Rb-Pli6 6 Way Mono Passive Line Isolation Unit
MATCHING CONVERTERS 6 RB-PLI6 6 Way Mono Passive Line Isolation Unit Introduction Fig 6-1: RB-PLI6 Front Panel. The RB-PLI6 6 way mono passive line isolation unit is used to isolate audio signals from inter area ground hum loops, which could be caused by equipment being powered by different mains power supplies or phases on the same supply. -
Page 34: Outputs
MATCHING CONVERTERS Rear Panel Connections and Operation Outputs Inputs Fig 6-3: RB-PLI6 Rear Panel. Inputs There are 6 off XLR 3 pin socket inputs. They have the following connections: Pin 1: Screen Pin 2: Phase Pin 3: Non-phase Outputs There are 6 off XLR 3 pin plug outputs. They have the following connections: Pin 1: Screen Pin 2: Phase Pin 3: Non-phase... -
Page 35: Technical Specifications
MATCHING CONVERTERS Technical Specifications Audio Specification Output Impedance: <150Ω Distortion: 0.5% THD @ 40Hz, ref +17dBu output Common Mode Rejection: <64dB typically Frequency Response: 10Hz to 36kHz ±0.5dB Connections Inputs: 6 x XLR 3 pin female (balanced) Outputs: 6 x XLR 3 pin male (balanced) Equipment Type RB-PLI6: 6 way mono passive line isolation unit... -
Page 36: Rb-Da6 & Rb-Da6G 6 Way Stereo Distribution Amplifier
AU DI O DIS TRIB UTIO N AM PLI FIERS 7 RB-DA6 & RB-DA6G 6 Way Stereo Distribution Amplifier Introduction Fig 7-1: RB-DA6 Front Panel. Fig 7-2: RB-DA6G Front Panel. The RB-DA6 and RB-DA6G are high performance 6 way stereo analogue distribution amplifiers for splitting a source to a number of different outputs. -
Page 37: Fig 7-3: Rb-Da6 Block Diagram
AUD I O D I S TRI BU T I ON AMP LI FI E R S System Block Diagrams Left Outputs Right Outputs Balanced Balanced (Mono 7-12) Left Input Balanced Gain Stereo/Mono Right Gain Input Balanced Fig 7-3: RB-DA6 Block Diagram. Left Outputs Right Outputs Balanced... -
Page 38: Connections And Operation
AU DI O DIS TRIB UTIO N AM PLI FIERS Connections and Operation Fig 7-5: RB-DA6 & RB-DA6G Rear Panel. Inputs (Left and Right) The XLR-3 input connectors can take balanced professional levels, or unbalanced by using the front panel gain controls, and by connecting the non-phase to the signal ground. The input can be configured as either a stereo input with six stereo outputs or a mono input with twelve outputs. -
Page 39: Stereo/Mono Operation
AUD I O D I S TRI BU T I ON AMP LI FI E R S Stereo/ Mono Output Gain Controls Switch Fig 7-7: RB-DA6G Front Panel. Stereo/Mono Operation The mode of operation may be switched between a stereo distributed channel to 6 stereo channels, and a mono channel to 12 mono channels, by the push button on the front panel, which is recessed to prevent accidental switching. -
Page 40: Rb-Da4X5 4 Input, 4 X 5 Output Distribution Amplifier/Mixer
AU DI O DIS TRIB UTIO N AM PLI FIERS 8 RB-DA4x5 4 Input, 4 x 5 Output Distribution Amplifier/Mixer Introduction Output Input Input/ Gain Input Gain Output Controls Selectors Controls Levels Fig 8-1: RB-DA4x5 Front Panel. The RB-DA4x5 is a 1U rack-mount combined distribution amplifier and mixer. It has 4 mono analogue audio inputs on female XLR and 4 groups of 5 outputs on 15 way D-type connectors. -
Page 41: Audio Inputs 1-4
AUD I O D I S TRI BU T I ON AMP LI FI E R S System Block Diagram Balanced XLR Input 1 Gain Balanced XLR Input 2 Gain Output 1 Balanced XLR Output 1 Switch Bank Input 3 Switch Bank Gain Gain... -
Page 42: D-Type Audio Output Groups 1-4
AU DI O DIS TRIB UTIO N AM PLI FIERS D-Type Audio Output Groups 1-4 Each output group connector has 5xDA driven balanced audio outputs on a D-type connector outputs each with an output impedance of <50Ω. Output 2 Output 4 Output 1 Output 3 Output 5... -
Page 43: Alignment Test Tone
AUD I O D I S TRI BU T I ON AMP LI FI E R S Group 1 Group 2 Group 3 Group 4 Function Routing Routing Routing Routing Input 1 SW1-1 On SW1-6 On SW2-1 On SW2-6 On Input 2 SW1-2 On SW1-7 On... -
Page 44: Rb-Dda6S 6 Way Stereo S/Pdif Digital Distribution Amplifier
AU DI O DIS TRIB UTIO N AM PLI FIERS 9 RB-DDA6A 6 Way Stereo AES/EBU Digital Distribution Amplifier and RB-DDA6S 6 Way Stereo S/PDIF Digital Distribution Amplifier Introduction Fig 9-1: RB-DDA6A/S Front Panel. The RB-DDA6A digital distribution amplifier is used for distributing digital audio data in AES/EBU format, repeating both the audio data and the status information of the input whilst re-normalising to standard digital audio levels. -
Page 45: System Block Diagrams
AUD I O D I S TRI BU T I ON AMP LI FI E R S System Block Diagrams Output XLR-3 Male AES/EBU Transmitter Output XLR-3 Male AES/EBU Transmitter Output XLR-3 Male AES/EBU Transmitter Input XLR-3 Female AES/EBU Receiver Output XLR-3 Male AES/EBU... -
Page 46: Fig 9-3: Rb-Dda6S System Block Diagram
AU DI O DIS TRIB UTIO N AM PLI FIERS Output RCA Phono S/PDIF Transmitter Output RCA Phono S/PDIF Transmitter Output RCA Phono S/PDIF Transmitter Input RCA Phono S/PDIF Receiver Output RCA Phono S/PDIF Transmitter Output RCA Phono S/PDIF Transmitter Output RCA Phono S/PDIF... -
Page 47: Rear Panel Connections And Operations
AUD I O D I S TRI BU T I ON AMP LI FI E R S Rear Panel Connections and Operations AES/EBU AES/EBU Input Outputs Fig 9-4: RB-DDA6A Rear panel. AES/EBU Input The XLR 3 pin socket has an impedance of 110Ω. It has the following connections: Pin 1: Screen Pin 2: Phase Pin 3: Non-phase... -
Page 48: Technical Specifications
AU DI O DIS TRIB UTIO N AM PLI FIERS Technical Specifications Audio Specifications RB-DDA6A Input Impedance: 110Ω ± 20% balanced Output Impedance: 110Ω ± 20% balanced Sample Freq Range: 30-100kHz (i.e. including 32kHz, 44.1kHz, 48kHz, 64kHz, 88.2kHz and 96kHz) Signal Level: 2V/7V peak to peak min/max RB-DDA6S... -
Page 49: Rb-Dda6W 6 Way Word Clock Distribution Amplifier
AUD I O D I S TRI BU T I ON AMP LI FI E R S RB-DDA6W 6 Way Word Clock Distribution Amplifier Introduction Fig 10-1: RB-DDA6W Front Panel. The RB-DDA6W 6 Way Word Clock Distribution Amplifier distributes a word clock BNC input signal to 6 word clock BNC outputs re-conditioned. -
Page 50: Fig 10-2: Rb-Dda6W System Block Diagram
AU DI O DIS TRIB UTIO N AM PLI FIERS System Block Diagram Output Transmitter Output Transmitter Output Transmitter Input Receiver Output Transmitter Output Transmitter Output Transmitter Fig 10-2: RB-DDA6W System Block Diagram. Redbox User Handbook No 2... -
Page 51: Word Clock Input
AUD I O D I S TRI BU T I ON AMP LI FI E R S Rear Panel Connections and Operations Word Clock Word Clock Outputs Input Fig 10-3: RB-DDA6W Rear Panel. Word Clock Input The Word Clock BNC input has an impedance of 75 Ω. Word Clock Outputs The Word Clock BNC outputs have an impedance of <50 Ω. -
Page 52: Rb-Hd1 Stereo Headphone Amplifier & Rb-Hd2 Dual Headphone Amplifier
H EA D PHO NE DIS TR IBU TIO N AM PLI FIERS RB-HD1 Stereo Headphone Amplifier & RB-HD2 Dual Headphone Amplifier Introduction Fig 11-1: RB-HD1 Front Panel. The 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. -
Page 53: Fig 11-3: Rb-Hd1 Block Diagram
HEA DP H O N E D I ST RI BU T IO N A MP LI F IE R S System Block Diagrams Left Input Audio Input Stereo Jack Audio XLR Amplifier Output Audio Output Amplifier Right Input Audio XLR Stereo Jack Push Stereo/Mono... -
Page 54: Front Panel Connections And Controls
H EA D PHO NE DIS TR IBU TIO N AM PLI FIERS Front Panel Connections and Controls Volume Stereo Level Output Control Fig 11-5: RB-HD1 Front Panel Controls. Stereo Outputs 1-2 (Mono Outputs1-2) The outputs available on the front and rear panel through ¼” stereo jack sockets are push- pull, designed to drive 150 mW into 32Ω... -
Page 55: Main Stereo Inputs (Left And Right)
HEA DP H O N E D I ST RI BU T IO N A MP LI F IE R S Rear Panel Connections and Operation Main Mono Stereo Remote Headphone Inputs Input Connector Mono Mix Input Stereo/ Mono Local/ Remote Switch Gain Adjustment Control Switch... -
Page 56: Mono Mix Input (Rb-Hd1)
H EA D PHO NE DIS TR IBU TIO N AM PLI FIERS Stereo/Mono Operation The mode of operation may be switched between a stereo distributed channel to 2 stereo channels, or a mono channel to two mono paired outputs (i.e. the same signal to both ear pieces) by using the push button, mounted on the rear panel to prevent accidental switching. -
Page 57: Technical Specifications
HEA DP H O N E D I ST RI BU T IO N A MP LI F IE R S Technical Specifications Audio Specifications RB-HD1 & RB-HD2: Maximum Input Level: +28dBu Input Impedance: >20kΩ balanced bridging (main) Input Gain Range: -12dB to +20dB (pre-set pots) (RB-HD2) Output Level: Drives 150 mW into 32Ω... -
Page 58: Rb-Hd6 6 Way Headphone Distribution Amplifier
H EA D PHO NE DIS TR IBU TIO N AM PLI FIERS RB-HD6 6 Way Headphone Distribution Amplifier Introduction Fig 12-1: RB-HD6 Front Panel. The RB-HD6 is a high performance 6-way stereo headphone distribution amplifier for driving up to 6 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 twelve outputs (i.e. -
Page 59: Fig 12-2: Rb-Hd6 Block Diagram
HEA DP H O N E D I ST RI BU T IO N A MP LI F IE R S System Block Diagram Fig 12-2: RB-HD6 Block Diagram. Redbox User Handbook No 2... -
Page 60: Stereo Input (Left And Right)
H EA D PHO NE DIS TR IBU TIO N AM PLI FIERS Rear Panel Connections and Operation Stereo Inputs Channel Insertion Inputs Stereo/ Mono Operation Fig 12-3: RB-HD6 Rear Panel. Stereo Input (Left and Right) The XLR-3 input connectors can take balanced professional levels, or unbalanced by using the front panel master control to increase the input level, and by connecting the non- phase to the signal ground. -
Page 61: Configuring Insert Inputs/Parallel Outputs
HEA DP H O N E D I ST RI BU T IO N A MP LI F IE R S Configuring Insert Inputs/Parallel Outputs On the main circuit board, you’ll see some jumpers (small black rectangles), the position of which will define whether a particular jack socket operates as an input or output. -
Page 62: Channel Volume Controls
H EA D PHO NE DIS TR IBU TIO N AM PLI FIERS 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. -
Page 63: Rb-Dhd6 Digital 6 Way Headphone Distribution Amplifier
AUD I O D I S TRI BU T I ON AMP LI FI E R S RB-DHD6 Digital 6 Way Headphone Distribution Amplifier Introduction Fig 13-1: RB-DHD6 Front Panel. The RB-DHD6 digital 6 way headphone distribution amplifier is a 1U rack- mount which receives a digital input signal, as either AES/EBU or S/PDIF and converts it to 6 individually buffered, jack-plug, headphone outputs, each with their own volume control. -
Page 64: Sync & Power Indicator
AU DI O DIS TRIB UTIO N AM PLI FIERS Sync & Power Indicator The LED on the front panel is normally red to indicate that power is present on the unit. However, it also has a secondary role to indicate the status of the digital inputs Flashing between red and amber –... -
Page 65: Digital Input Select Button
HEA DP H O N E D I ST RI BU T IO N A MP LI F IE R S If de-emphasis is ‘on’ (switch 1) the RB-DHD6 will decode 50/15μs emphasis when indicated by certain channel status bits in the incoming digital audio data. When ‘off’ , no de-emphasis is applied. -
Page 66: Connectors & Cabling
CO NN E C TORS & C AB LING Connectors & Cabling Many of the problems associated with installing and maintaining studio equipment are due to the use of poor cables or faulty connections. It is recommended that, wherever possible, pre-wired cables are purchased from recommended manufacturers. -
Page 67: Fig 14-4: 25 Way D-Type Connectors
CO NNE C TORS & C ABLI N G D-Type Connectors The following diagram shows the connection details for the D-type connectors as viewed from the rear of a Redbox : Pin 1 Male Pin 13 Pin 13 Female Pin 1 Pin 14 Pin 25 Pin 25... -
Page 68: Glossary
G LOS SA RY Glossary 1kHz 1000Hz or 1 kilohertz tone of 1kHz is often used for line-up and testing. ADSL Asynchronous Digital Subscriber Link - a broadband delivery system over standard telephone lines (between the exchange and the user). Audio Engineering Society. - Page 69 G LO SSA RY Digital Audio Tape. dB (decibel) A ratio of two voltages or signal levels, expressed by the equation dB=20LOG(V1/V2) Adding the suffix “u” denotes that the signal is relative to 0.775V RMS. Adding the suffix “v” denotes that the signal is relative to 1V RMS. This is radio code signal sourced from Mainflingen, near Frankfurt in Germany, which can be used to automatically synchronize the Sentinel+ audio logger and PC time to an accurate atomic clock,...
- Page 70 GLOS SA RY kbps Kilo-bits per second - the number of 1s or 0s transmitted or transferred in one second. Kilo Hertz (samples per second). Local Area Network - scheme where several computers on the same premises are connected together so that they can exchange data. Liquid Crystal Display (grey displays e.g.
- Page 71 In most European countries, including the UK, the TBU must be approved for connection to telephone company lines. Sonifex TBU’s carry British Telecom and pan European approval. The Total Harmonic Distortion is the percentage presence of signals outside the measured reference frequency.
- Page 72 w w w . s o n i f e x . c o . u k t:+44 (0)1933 650 700 f:+44 (0)1933 650 726 s a l e s @ s o n i fe x . co. u k...