ADA converter HDA headphone amplifier Owner’S Manual © 2009 CEDAR Audio Ltd Manual version 1.
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Table of Contents Safety Instructions......................................................................................... 5 ADA: Introduction.......................................................................................... 6 ADA: Rear Panel Connections and Operation.............................................. 8 HDA: Introduction........................................................................................ 12 HDA: Rear Panel Connections and Controls..................................
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Safety Instructions Failure to adhere to the safety instructions may cause severe damage to an ADA or HDA as well as risk of electric shock. n Unpacking Unpack the unit carefully. Save the packing materials since you may need them to transport it in the future. In addition to this manual, the unit and its packaging, the box should contain a mains lead, rubber feet, rackmounting accessories and a warranty registration card. n Water and moisture The unit must not be exposed to rain or moisture.
ADA: Introduction The CEDAR ADA is a 24-bit, 96kHz 1U rackmount unit that produces an AES/EBU or SPDIF digital audio output from a balanced or unbalanced analogue stereo audio input. It also produces a stereo balanced or unbalanced analogue output from an incoming AES/EBU or SPDIF digital input signal. At any given time, the unit operates in one of four sync modes: Master Mode The clock signals are generated internally by an on-board master clock at a userselectable rate: 32kHz, 44.1kHz, 48kHz, 64kHz, 88.
Input and Output The CEDAR ADA has analogue inputs and outputs at both professional and consumer signal levels. The professional level signals are electronically balanced and use XLR connectors, while the consumer signals are unbalanced and are carried by RCA (phono) connectors. In each case, the input level is adjustable over a range of 18dB, and the output level may be set to one of three levels, each separated by 6dB. There is a button to select professional or consumer input.
ADA: Rear Panel Connections and Operation ANALOGUE INPUTS INPUT SELECT FULL SCALE L dB SETTINGS ANALOGUE OUTPUTS L LEVEL L LEFT R R RIGHT DIGITAL INPUTS AES/EBU OUTPUT S/PDIF S/PDIF AES/EBU AES/EBU FREQUENCIES AND SYNC MODES STATUS CEDAR ADA CONVERTER 230V 100mA 115V 200mA FUSE R LEFT RIGHT CAUTION: DIGITAL OUTPUTS AES/EBU INPUT Disconnect the mains supply before removing the equipment covers.
AES/EBU Input The digital input XLR 3-pin socket has an impedance of 110Ω. It has the following connections: n Pin 1: Screen. n Pin 2: Signal +ve (hot) n Pin 3: Signal -ve (cold) SPDIF Input The SPDIF input has an impedance of 75Ω. Outputs Analogue Outputs (Left and Right) The XLR 3-pin output connectors are electronically balanced with an output impedance of less than 50Ω. They have the following connections : n Pin 1: Screen.
Rear Panel Controls Status Select Switches These switches determine the channel status of the digital signals. The channel status bits of the digital audio signal can be Professional or Consumer, as determined by switch 1. At sample rates higher than 48kHz, Consumer mode is not available, so Professional mode is used and this switch is ignored. If de-emphasis is selected (switch 2) the ADA will decode 50/15µs emphasis when the incoming channel status indicates that this is appropriate.
Frequency and Sync Mode This rotary switch selects the Synchronisation Mode and the frequency of the digital output when using the on-board clock generator. There are 4 modes of operation: Master Sync Mode (Switch positions 0–5) n The digital output sample rate is set by and locked to the internal clock generator. No sync signal is used. Auto Sync Mode (Switch positions 6–B) n The digital output sample rate follows the digital input.
HDA: Introduction The CEDAR HDA headphone amplifier is a 24-bit, 96kHz rackmount unit that receives an AES/EBU or SPDIF digital input signal and converts it to six individually buffered ¼” (6.3mm) stereo headphone outputs, each with its own volume control. Input and Output The input connectors comprise a balanced XLR-3 for the AES/EBU input and an unbalanced phono connector for the S/PDIF input.
HDA: Rear Panel Connections and controls Digital Input Select Button Switch the digital input between AES/EBU (button out) and S/PDIF (button in). Digital Inputs The signals on these connectors should meet the IEC 60968 specification. AES/EBU Input The XLR 3-pin socket has an impedance of 110Ω. It has the following connections: n Pin 1: Screen n Pin 2: Signal +ve (hot) n Pin 3: Signal -ve (cold) SPDIF Input The SPDIF input has an impedance of 75Ω.
HDA: Front Panel Connections and Operation Headphone Outputs The headphone outputs on the front panel consist of six ¼” stereo jack sockets designed to drive a maximum of 150 mW into 32Ω to 600Ω professional headphones. Volume Controls Each headphone output has its own volume control. The maximum output level is +12dBu. Power & Signal Indicator The LED on the front panel is normally lit to indicate that power is present on the unit. Flashing indicates a loss of a valid digital input signal.
CE Declaration of Conformity Equipment: CEDAR ADA and HDA Date of issue: 19 February 2003 (CEDAR ADA) Date of issue: 1 October 2009 (CEDAR HDA) Manufacturer: CEDAR Audio Ltd Address: 20 Home End, Fulbourn, Cambridge CB21 5BS, UK This is to certify that the aforementioned equipment, when used in accordance with the instructions in this manual, fully conforms to the protection requirements of the following EC Council Directives: on the approximation of the laws of the member states relating to: E
Specifications CEDAR ADA: A/D Connections Analogue Inputs: Digital Outputs: 2 2 1 1 x x x x XLR 3-pin (balanced) (L & R) RCA phono (unbalanced) (L & R) AES/EBU XLR 3-pin plug SPDIF RCA phono socket A/D Audio Specification Maximum Input Level: +27dBu (balanced inputs) Maximum Input Level: +17dBu (unbalanced inputs) Input Impedance: >10kΩ bridging (balanced inputs) Input Impedance: >20kΩ (unbalanced inputs) Input Levels: User selectable +12dBu, +18dBu, +24dBu for FSD Gain Range: Adjustable 3dB loss to 3dB
CEDAR HDA: D/A Connections Digital Inputs: 1 x AES/EBU XLR 3-pin socket 1 x SPDIF RCA phono D/A Audio Specification Sampling Frequencies: Dynamic Range: 30kHz – 100kHz >100dB Outputs Headphones: Power: Maximum Output Level: Headphone Gain: 6 x ¼” (6.
Licence and Limited Warranty 1. DEFINITIONS In this Licence and Limited Warranty the following words and phrases shall bear the following meanings: ‘the Company’ is CEDAR Audio Limited of 20 Home End, Fulbourn, Cambridge CB21 5BS, UK; ‘the System’ means an instance of the CEDAR ADA converter or the CEDAR HDA headphone amplifier; ‘this Document’ means this Licence and Limited Warranty. 2. ISSUE AND USE OF THE SYSTEM 2.
5. FORCE MAJEURE The Company shall not be liable for any breach of its obligations hereunder resulting from causes beyond its reasonable control including, but not limited to, fires, strikes (of its own or other employees), insurrection or riots, embargoes, container shortages, wrecks or delays in transportation, inability to obtain supplies and raw materials, or requirements or regulations of any civil or military authority. 6.
CEDAR ADA & HDA CEDAR ADA Serial number Inspection date QC Engineer CEDAR HDA Serial number Inspection date QC Engineer CEDAR Audio Ltd 20 Home End Fulbourn Cambridge CB21 5BS United Kingdom www.cedaraudio.com info@cedaraudio.
