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 Dual stereo bi-directional matching converter RB-PA2 Dual stereo RIAA phono amplifier RB-LI2 Stereo line isolation unit RB-PLI6
Revision 2.03 March, 2008 ©Sonifex Ltd, 2000-8 All Rights Reserved Sonifex Ltd, 61, Station Road, Irthlingborough, Northants, NN9 5QE, England. Tel : +44 (0)1933 650 700 Fax : +44 (0)1933 650 726 Email : sales@sonifex.co.uk or technical.support@sonifex.co.uk Web : http://www.sonifex.co.uk Information in this document is subject to change without notice and does not represent a commitment on the part of Sonifex Ltd.
CONTENTS Warranty i i ii iii Safety Information iii Safety of Mains Operated Equipment Voltage Setting Checks Fuse Rating Power Cable and Connection Ordering the Correct Mains Lead iii iii iii iv iv Installation Information iv Atmosphere Electromagnetic Radiation Fitting Redboxes WEEE & RoHS Directives - Sonifex Statement iv iv iv vi MATCHING CONVERTERS 1 RB-UL1 Single, RB-UL2 Dual & RB-UL4 Quad Stereo Unbalanced To Balanced Converters 1 Introduction System Block Diagram Rear Panel Connections
CO N T E N TS CON T E N TS 4 RB-PA2 Dual Stereo RIAA Phono Amplifier 13 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 13 13 14 14 14 14 14 15 5 16 RB-LI2 Stereo Line Isolation Unit Introduction System Block Diagram Rear Panel Connections and Operation Inputs Isolated Outputs Loop Outputs Output Level Adjustment Internal Jumpers Technical Specif
CON TEN TS 9 RB-DDA6A 6 Way Stereo AES/EBU Digital Distribution Amplifier and RB-DDA6S 6 Way Stereo S/PDIF Digital Distribution Amplifier 30 Introduction System Block Diagrams Rear Panel Connections and Operations AES/EBU Input AES/EBU Outputs S/PDIF Input S/PDIF Outputs Technical Specifications 30 31-32 33 33 33 33 33 34 35 Introduction System Block Diagram Rear Panel Connections and Operations Word Clock Input Word Clock Outputs Technical Specifications 35 36 37 37 37 37 HEADPHONE DISTRIBUTION AMPL
CON T E N TS CO N T E N TS f 13 RB-DHD6 Digital 6 Way Headphone Distribution Amplifier 49 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 49 49 49 50 50 50 50 50 50 50 51 51 14 Connectors & Cabling 52 XLR 3 Pin Connectors RCA Phono Connectors ¼” Jack Connector D-Type Connectors 52 52 5
FIGURES Figures Fig A: Packing List. ii Fig B: Mains Cable Wire Colours iv Fig C: Mains Lead Table. iv Fig D: RB-RK1Small Redbox Front Rack-mount Kit . v Fig E: RB-RK2 Small Redbox Rear Rack-mount Kit. v v Fig 1-1: RB-UL1 & RB-UL2 Front Panel. 1 Fig 1-2: RB-UL4 Front Panel. 1 Fig 1-3: Block Diagram For a Single Channel (x2 for RB-UL2, x4 for RB-UL4). 1 Fig 1-4: RB-UL1 Rear Panel. 2 Fig 1-5: RB-UL2 Rear Panel. 2 Fig 1-6: RB-UL4 Rear Panel. 2 Fig 2-1: RB-LU4 Front Panel.
FI G U RE S FIGURES h Fig 8-5: RB-DA4x5 Pinout for Audio Output Group Connector. 28 Fig 8-6: RB-DA4x5 Routing Selection Switch. 28 Fig 8-7: RB-DA4x5 Routing Selection Switch Functions. 29 Fig 9-1: RB-DDA6A/S Front Panel. 30 Fig 9-2: RB-DDA6A System Block Diagram. 31 Fig 9-3: RB-DDA6S System Block Diagram. 32 Fig 9-4: RB-DDA6A Rear Panel. 33 Fig 9-5: RB-DDA6S Rear Panel. 33 Fig 10-1: RB-DDA6W Front Panel. 35 Fig 10-2: RB-DDA6W System Block Diagram. 36 Fig 10-3: RB-DDA6W Rear Panel.
WARR ANT Y Warranty Warranty and Liability - important the purchaser is advised to read this clause (a) 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 becoming apparent to the Purchaser; (ii) The Goods have only been operated
WA R R A N T Y WA RR A N T Y (ii) For any breach by the Company of any statutory undertaking as to title, quiet possession and freedom from encumbrance. (d) 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.
SAFE T Y & INSTALL ATION IN FORMATION Each Redbox is shipped in protective packaging and should be inspected for damage before use. Where an item is found to have transit damage, notify the carrier immediately with all the relevant details of the shipment. Packing materials should be kept for inspection and also for if the product needs to be returned.
S A F E T Y & I NSTALL ATION INF O R MAT I ON Power Cable and Connection SAFE T Y & INS TALL ATION IN FORMAT I ON An IEC power connector is supplied with the Redbox, which has a moulded plug, attached – this is a legal requirement. If no moulded plug has been supplied with your Redbox, please contact your supplier, because an IEC connector is always supplied from the Sonifex factory.
SAFE T Y & INSTALL ATION IN FORMATION 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). Fig D: RB-RK1Small Redbox Front Rack-mount Kit . Rear Mounting Redboxes: For rear panel mounting you can use either the RB-RK2, or RB-RK3, depending on the size of your Redbox.
S A F E T Y & I NSTALL ATION INF O R MAT I ON WEEE & RoHS Directives - Sonifex Statement SAFE T Y & INS TALL ATION IN FORMAT I ON The Waste Electrical and Electronic Equipment (WEEE) Directive was agreed on 13 February 2003, along with the related Directive 2002/95/EC on Restrictions of the use of certain Hazardous Substances in electrical and electronic equipment (RoHS).
MATC HING CON VERTERS 1 1 RB-UL1 Single, RB-UL2 Dual & RB-UL4 Quad Stereo Unbalanced To Balanced Converters Introduction 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. All connections are on the rear panel. The RCA unbalanced inputs have an impedance of 10kΩ bridging and are routed to the balanced XLR-3 outputs with an output impedance of <50Ω.
1 MATC H I N G CO NVE R T E R S Rear Panel Connections and Operation MATC HIN G CO NVER TE RS - RB - UL1, RB - U L2 , RB - U L4 RCA Phono Inputs Output Level Adjustment Fig 1-4: RB-UL1 Rear Panel. RCA Phono Inputs Output Level Adjustment Stereo Balanced Outputs Fig 1-5: RB-UL2 Rear Panel. RCA Phono Inputs Fig 1-6: RB-UL4 Rear Panel.
MATC HING CON VERTERS 1 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.
1 MATC H I N G CO NVE R T E R S MATCH ING CON VERT ER S - RB - UL1, RB - U L2 , RB - U L4 Technical Specifications 4 Audio Specifications Maximum Input Level: Input Impedance: Output Impedance: Maximum Output Level: Distortion: Noise: Common Mode Rejection: Frequency Response: Gain Range: +28dBu >10kΩ <50Ω +28dBu 0.01% THD @ 1kHz ref +8dB output -100dB unity gain, ref +8dB output >66dB typically 20Hz to 20kHz ±0.
MATC HING CON VERTERS 2 2 RB-LU4 Quad Stereo Balanced To Unbalanced Converter Introduction Fig 2-1: RB-LU4 Front Panel. All connections are on the rear panel. The eight XLR-3 electronically balanced inputs have an impedance of 20kΩ bridging and are routed to eight unbalanced RCA phono outputs with an output impedance of <50Ω. The output gain can be individually adjusted for left and right channels by using pre-set potentiometers accessible through the rear panel.
2 MATC H I N G CO NVE R T E R S System Block Diagram Left Input 1 Professional/ Balanced MATCHING CON VERTE RS - RB - LU 4 Right Input 1 Professional/ Balanced Left Input 2 Professional/ Balanced Right Input 2 Professional/ Balanced Left Input 3 Professional/ Balanced Right Input 3 Professional/ Balanced Left Input 4 Professional/ Balanced Right Input 4 Professional/ Balanced Phono Left Output 1 Consumer/Unbalanced Gain Phono Right Output 1 Consumer/Unbalanced Gain Phono Left Output 2 Consum
MATC HING CON VERTERS Rear Panel Connections and Operation Fig 2-3: RB-LU4 Rear Panel. RCA Phono Outputs Output Level Adjustment 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 bridging. They are routed to an unbalanced RCA (phono) output with an output impedance of <50Ω.
2 MATC H I N G CO NVE R T E R S MATCHING CON VERTE RS - RB - LU 4 Technical Specifications 8 Audio Specifications Maximum Input Level: Input Impedance (XLR): Output Impedance (RCA) : Maximum Output Level: Distortion: Noise: Common Mode Rejection: Frequency Response: Gain Range: Connections Inputs: Outputs: Mains Input: Fuse Rating: +28dBu >20kΩ balanced bridging <50Ω +22dBu 0.01% THD @ 1kHz, ref +8dBu output -100dB, unity gain, ref +8dBu output >66dB typically 20Hz to 20kHz ±0.
MATC HING CON VERTERS 3 3 RB-BL2 Single & RB-BL4 Dual Bi-Directional Matching Converter Introduction 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 bidirectional stereo capability. All connections are on the rear panel.
3 MATC H I N G CO NVE R T E R S System Block Diagram Phono Left Input 1 Professional/ Balanced Gain Phono MATCH ING CON VERTERS - RB - BL2 & RB - BL4 Right Input 1 Professional/ Balanced Left Input 2 Consumer/ Unbalanced Right Input 2 Consumer/ Unbalanced Left Output 1 Consumer/Unbalanced Right Output 1 Consumer/Unbalanced Gain Phono Left Output 2 Professional/Balanced Gain Phono Right Output 2 Professional/Balanced Gain Fig 3-3: RB-BL2/BL4 Block Diagram Single Stereo Channel.
MATC HING CON VERTERS RCA Phono Outputs Balanced Outputs Balanced RCA Phono Inputs Inputs Balanced Outputs RCA Phono Inputs Unbalanced Output Level Control Balanced Output Level Control Fig 3-5: RB-BL4 Rear Panel. Balanced to Unbalanced Connections Inputs 1 (& 3) (Left & Right) The XLR 3 pin sockets used for the left and right channel signals of Inputs 1 & 3 are electronically balanced and have an impedance of 20kΩ bridging.
3 MATC H I N G CO NVE R T E R S MATCH ING CON VERTERS - RB - BL2 & RB - BL4 Technical Specifications 12 Audio Specifications Maximum Input Level: Maximum Output Level: Input Impedance (RCA) : Input Impedance (XLR) : Output Impedance (RCA) : Output Impedance (XLR) : Distortion: Noise: Common Mode Rejection: Frequency Response: Gain Range: Gain Range: Connections Inputs: Outputs: Mains Input: Fuse Rating: +28dBu +28dBu >10kΩ unbalanced >20kΩ balanced bridging <50Ω <50Ω 0.
MATC HING CON VERTERS 4 4 RB-PA2 Dual Stereo RIAA Phono Amplifier Introduction 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.
4 MATC H I N G CO NVE R T E R S Rear Panel Connections and Operation MATC HIN G CONVERTERS - RB - PA 2 Pick-up Grounding Post RCA Phono Inputs Output Level Adjustments Stereo Balanced Outputs Pick-up Grounding Post RCA Phono Inputs Stereo Balanced 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.
MATC HING CON VERTERS 4 Technical Specifications Connections Inputs: Outputs: Earth Tag: Mains Input: Fuse Rating: +28dBu >47kΩ 1mV to 25mV (ref 1kHz) +28dBu <50Ω Adjustable 38dB to 58dB gain via 4 multi-turn pots Better than -80dBu at 1kHz 10Hz-150kHz (-3dB) Within 0.5dB of RIAA curve 0.
5 MATC H I N G CO NVE R T E R S 5 RB-LI2 Stereo Line Isolation Unit Introduction MATCHING CON VERTE RS - RB - LI 2 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.
MATC HING CON VERTERS 5 Rear Panel Connections and Operation Isolated Output Input Input Loop Output Output Level Adjustment Fig 5-3: RB-LI2 Rear Panel. Inputs There are 2 input XLR 3 pin sockets.
5 MATC H I N G CO NVE R T E R S 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. MATCHING CON VERTE RS - RB - LI 2 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.
MATC HING CON VERTERS 6 6 RB-PLI6 6 Way Mono Passive Line Isolation Unit Introduction Fig 6-1: RB-PLI6 Front Panel. The input and output are connected together through a transformer and the unit has internal jumpers allowing the inputs and/or outputs to be balanced about ground. The unit requires no mains power for operation. This unit is useful where audio is required to be driven over a relatively long length of cable.
6 MATC H I N G CO NVE R T E R S Rear Panel Connections and Operation Outputs MATC HIN G CONVERTERS - RB - P LI 6 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.
MATC HING CON VERTERS 6 Technical Specifications <150Ω 0.5% THD @ 40Hz, ref +17dBu output <64dB typically 10Hz to 36kHz ±0.5dB Connections Inputs: Outputs: 6 x XLR 3 pin female (balanced) 6 x XLR 3 pin male (balanced) Equipment Type RB-PLI6: 6 way mono passive line isolation unit Physical Specifications Dimensions (Raw): Dimensions (Boxed): Weight: 48cm (W) x 10.8cm (D) x 4.2cm (H-1U nominally) 53cm (W) x 20.5cm (D) x 6cm Nett: 1.5kg Gross: 1.
7 AU DI O DI S T R I B U T I O N A M P LI F I E R S 7 RB-DA6 & RB-DA6G 6 Way Stereo Distribution Amplifier Introduction AUD IO D ISTR IBUTIO N AM PLIFIERS - RB - DA6 & RB - DA 6 G Fig 7-1: RB-DA6 Front Panel. 22 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. The RB-DA6 has 1 stereo input and 6 stereo outputs with gain control on both inputs.
AUDIO D ISTRIBUTION AMP LIFIERS 7 System Block Diagrams Left Outputs Balanced 1 2 3 4 Right Outputs Balanced (Mono 7-12) 5 6 1 2 3 4 6 5 6 Left Input Balanced Gain Right Input Balanced Stereo/Mono Gain Fig 7-3: RB-DA6 Block Diagram. Left Outputs Balanced 1 2 3 4 Left Input Balanced Right Input Balanced Stereo/Mono Fig 7-4: RB-DA6G Block Diagram.
7 AU DI O DI S T R I B U T I O N A M P LI F I E R S Connections and Operation AU D IO DISTRIB UTION AMP LIFIERS - RB - DA6 & RB - DA 6 G Fig 7-5: RB-DA6 & RB-DA6G Rear Panel. 24 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.
AUDIO D ISTRIBUTION AMP LIFIERS Output Gain Controls 7 Stereo/ Mono Switch Fig 7-7: RB-DA6G Front Panel. Technical Specifications Audio Specifications Input Impedance Output Impedance Maximum Input Level Maximum Output Level Frequency Response Gain Range Common Mode Rejection Distortion Noise >20kΩ bridging <50Ω +28dBu +28dBu 20Hz to 20kHz ± 0.1dB (600Ω load, ref 1kHz) Adjustable 8dB loss to 18dB gain >66dB typically 0.
8 AU DI O DI S T R I B U T I O N A M P LI F I E R S 8 RB-DA4x5 4 Input 4 x 5 Output Distribution Amplifier/Mixer Introduction AUDIO D ISTR IBUTIO N AMP LIFIERS - RB - DA 4 x5 Output Input Gain Gain Input Controls Selectors Controls 26 Input/ Output 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.
AUDIO D ISTRIBUTION AMP LIFIERS 8 System Block Diagram Balanced XLR Input 1 Gain Balanced XLR Input 2 Gain Balanced XLR Input 3 Output 1 Switch Bank Gain Gain Meter 1 Output Gain Meter 2 Output Gain Reference Tone Meter In 2 Meter Out 1 Meter Out 2 Meter 1 Meter 2 Meter In 3 Meter In 4 Meter Out 3 Meter Out 4 Meter 3 Output 1 Switch Bank Gain Meter 3 Output Meter 4 Output 1 Switch Bank Gain Meter 4 Output Fig 8-2: RB-DA4x5 Block Diagram.
8 AU DI O DI S T R I B U T I O N A M P LI F I E R S AUDIO D ISTR IBUTIO N AMP LIFIERS - RB - DA 4 x5 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 1 8 9 15 Output 1 Output 4 Output 3 Output 5 Fig 8-4: RB-DA4x5 Audio Output Group15-Way D-Type Plug. Function Out + Pin No. Out - Pin No. Signal Ground Pin No.
AUDIO D ISTRIBUTION AMP LIFIERS Function Input 1 Input 2 Input 3 Input 4 Test Tone Group 1 Routing SW1-1 On SW1-2 On SW1-3 On SW1-4 On SW1-5 On Group 2 Routing SW1-6 On SW1-7 On SW1-8 On SW1-9 On SW1-10 On Group 3 Routing SW2-1 On SW2-2 On SW2-3 On SW2-4 On SW2-5 On 8 Group 4 Routing SW2-6 On SW2-7 On SW2-8 On SW2-9 On SW2-10 On Fig 8-7: RB-DA4x5 Routing Selection Switch Functions.
9 AU DI O DI S T R I B U T I O N A M P LI F I E R S 9 RB-DDA6A 6 Way Stereo AES/EBU Digital Distribution Amplifier and RB-DDA6S 6 Way Stereo S/PDIF Digital Distribution Amplifier AU D IO DIS TR IBUTIO N AM PLIFIE RS - RB - D DA6A & RB - D DA 6 S Introduction 30 Fig 9-1: RB-DDA6A/S Front Panel.
AUDIO D ISTRIBUTION AMP LIFIERS 9 System Block Diagrams Output XLR-3 Male AES/EBU Transmitter Output XLR-3 Male Output XLR-3 Male AES/EBU Transmitter Input XLR-3 Female AES/EBU Receiver Output XLR-3 Male AES/EBU Transmitter Output XLR-3 Male AES/EBU Transmitter Output XLR-3 Male AES/EBU Transmitter Fig 9-2: RB-DDA6A System Block Diagram.
9 AU DI O DI S T R I B U T I O N A M P LI F I E R S Output RCA Phono S/PDIF Transmitter AU D I O D ISTR IB UTION AMP LIFIER S - RB - D DA6A & RB - D DA 6 S Output RCA Phono 32 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 Transmitter Fig 9-3: RB-DDA6S System Block Diagram.
AUDIO D ISTRIBUTION AMP LIFIERS 9 Rear Panel Connections and Operations AES/EBU Input AES/EBU Outputs 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 AES/EBU Outputs The XLR 3 pin sockets have an impedance of 110Ω. They have the following connections: Pin 1: Screen Pin 2: Phase Pin 3: Non-phase S/PDIF Input S/PDIF Outputs Fig 9-5: RB-DDA6S Rear Panel.
9 AU DI O DI S T R I B U T I O N A M P LI F I E R S AU D I O D ISTR IB UTION AMP LIFIER S - RB - D DA6A & RB - D DA 6 S Technical Specifications 34 Audio Specifications RB-DDA6A Input Impedance: Output Impedance: Sample Freq Range: Signal Level: 110Ω ± 20% balanced 110Ω ± 20% balanced 30-100kHz (i.e. including 32kHz, 44.1kHz, 48kHz, 64kHz, 88.
AUDIO D ISTRIBUTION AMP LIFIERS 10 10 RB-DDA6W 6 Way Word Clock Distribution Amplifier Introduction The RB-DDA6W 6 Way Word Clock Distribution Amplifier distributes a word clock BNC input signal to 6 word clock BNC outputs re-conditioned. It is used in distributing reference clocks for digital audio systems. It has a single female BNC input which is distributed to 6 female BNC outputs.
10 AU DI O DI S T R I B U T I O N A M P LI F I E R S System Block Diagram Output BNC TTL Transmitter AUD IO DISTRIB UTION AMP LIFIERS - RB - D DA 6 W Output BNC 36 TTL Transmitter Output BNC TTL Transmitter Input BNC TTL Receiver Output BNC TTL Transmitter Output BNC TTL Transmitter Output BNC TTL Transmitter Fig 10-2: RB-DDA6W System Block Diagram.
AUDIO D ISTRIBUTION AMP LIFIERS 10 Rear Panel Connections and Operations Word Clock Input Word Clock Outputs 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.
11 H E A D P H O NE DISTRIBUTION A M P LI F I E R S 11 RB-HD1 Stereo Headphone Amplifier & RB-HD2 Dual Headphone Amplifier Introduction HEADPHONE DISTRIBUTION AMPLIFIERS-RB-HD1 & RB-HD2 Fig 11-1: RB-HD1 Front Panel. 38 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. One headphone socket is on the front panel with one on the rear.
HEADPHONE DISTRIBUTION AMP LIFIERS 11 System Block Diagrams Left Input Audio XLR Audio Input Amplifier Stereo Jack Output VCA Audio Output Amplifier Right Input Audio XLR Stereo/Mono Control Switch Input Mono Mix Gain Remote Connector Stereo Jack Output Local/Remote Control Switch Volume Fig 11-3: RB-HD1 Block Diagram. XLR Master Input Audio Input Amplifier Volume Audio Output Amp Stereo Jack Output Stereo Push Switch Stereo/Mono Control Switch Fig 11-4: RB-HD2 Block Diagram.
11 H E A D P H O NE DISTRIBUTION A M P LI F I E R S Front Panel Connections and Controls HEADPHONE DISTRIBUTION AMPLIFIERS-RB-HD1 & RB-HD2 Volume Stereo Level Output Control 40 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 pushpull, designed to drive 150 mW into 32Ω to 600Ω professional headphones. Each output is individually buffered.
HEADPHONE DISTRIBUTION AMP LIFIERS 11 Rear Panel Connections and Operation Main Stereo Inputs Mono Mix Input Mono Mix Input Gain Adjustment Remote Connector Local/ Remote Control Switch Fig 11-7: RB-HD1 Rear Panel. Main Stereo Inputs Stereo/ Mono Switch Stereo Input Gain Adjustment Fig 11-8: RB-HD2 Rear Panel.
11 H E A D P H O NE DISTRIBUTION A M P LI F I E R S HEADPHONE DISTRIBUTION AMPLIFIERS-RB-HD1 & RB-HD2 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.
HEADPHONE DISTRIBUTION AMP LIFIERS 11 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 to 600Ω headphones Volume Control: -80dB to +11dB gain Mono Mix Input Gain Range: 22dBu (RB-HD1) 2 x XLR 3 pin female (Balanced, can be wired unbalanced) 1 x XLR 3 pin female (Balanced, can be wired unbalanced) 2 x ¼” (6.
12 H E A D P H O NE DISTRIBUTION A M P LI F I E R S 12 RB-HD6 6 Way Headphone Distribution Amplifier Introduction HE ADPHO NE DISTRIB UTION AMP LIFIERS - RB - H D 6 Fig 12-1: RB-HD6 Front Panel. 44 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.
HEADPHONE DISTRIBUTION AMP LIFIERS 12 System Block Diagram Redbox User Handbook No 2 H E A D P H ON E D ISTRIBUTION AMP LIFIER S - R B - H D 6 Fig 12-2: RB-HD6 Block Diagram.
12 H E A D P H O NE DISTRIBUTION A M P LI F I E R S Rear Panel Connections and Operation HEAD PH ON E D IST RIB UTION AMP LIFIERS - RB - H D 6 Stereo Inputs 46 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 nonphase to the signal ground.
HEADPHONE DISTRIBUTION AMP LIFIERS 12 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. The drawings below show the different jumper settings available. Each input/output can be configured individually, so you could have three jacks set as inputs and three as outputs if needed.
12 H E A D P H O NE DISTRIBUTION A M P LI F I E R S 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.
AUDIO D ISTRIBUTION AMP LIFIERS 13 13 RB-DHD6 Digital 6 Way Headphone Distribution Amplifier Introduction Fig 13-1: RB-DHD6 Front Panel. Useful for connection to digital mixing desks, digital routers and matrices, the RB-DHD6 connects directly to an AES/EBU or S/PDIF output to provide the highest quality audio directly to the headphones. The input connectors consist of a single balanced XLR-3 for the AES/EBU input and a single unbalanced phono connector for the S/PDIF input.
13 AU DI O DI S T R I B U T I O N A M P LI F I E R S 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 – indicates a loss of a valid digital input signal.
HEADPHONE DISTRIBUTION AMP LIFIERS 13 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. The switch is ‘on’ when it is down. Digital Input Select Button This button is used to switch the digital input between the AES/EBU XLR connector (button out) and the S/PDIF phono connector (button in).
14 CO N N E C TO RS & C A B LI NG 14 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. If you need bespoke cables making, please ensure that a qualified engineer carries out the work.
CO NNE C TORS & C ABLING 14 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 14 Pin 13 Pin 13 Pin 25 Pin 25 Female Pin 1 Pin 14 Fig 14-4: 25 Way D-Type Connectors. Male Pin 10 Pin 9 Pin 9 Pin 15 Pin 15 Female Pin 1 Pin 10 Fig 14-5: 15 Way D-Type Connectors. Pin 1 Male Pin 6 Pin 5 Pin 5 Pin 9 Pin 9 Fig 14-6: 9 Way D-Type Connectors.
15 G LO SS A RY 15 Glossary G LOS S A RY 1kHz ADSL 54 1000Hz or 1 kilohertz tone of 1kHz is often used for line-up and testing. Asynchronous Digital Subscriber Link - a broadband delivery system over standard telephone lines (between the exchange and the user). AES Audio Engineering Society. AES/EBU Professional digital audio standard covering frame format, connections and interfaces. Interface is usually on XLR sockets and plugs.
GLOSSARY DAT dB (decibel) DLS DSP EBU EIN ENG EON EQ FM FSD 3G Gain GRAM HDLC Hybrid IEC ISDN Redbox User Handbook No 2 G LOS S A RY DCF DDS & DDS-2 DI Digital Audio Tape. 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.
G LOS S A RY G LO SS A RY kbps kHz LAN LCD LED LNB MCR MDU MF MHz Mix-minus Mono MP3 MPEG MSF Musicam MUX Pan PFL PI Code PPM Promo PS Name (RDS) PSU PTY 56 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. on calculators).
GLOSSARY Racks Room TBU TCP/IP Telephone Balance Unit (TBU) or Hybrid THD TMC TP U UPS VHF VP VSWR VU WAP X21 XLR Redbox User Handbook No 2 G LOS S A RY RDS Reverb RF RJ-45 S/PDIF SPL TA T/B Often called the Master Control Room (MCR) or Central Apparatus Room (CAR), the racks room is an engineering area containing studio routing to transmitter equipment.
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