Page 1
OWNER’S MANUAL
© 2009 CEDAR Audio Ltd
Manual version 1.00: August 2009
ADA converter
HDA headphone amplier
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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 ..............................................13
HDA: Front Panel Connections and Operation ..........................................14
CE Declaration of Conformity .....................................................................15
Specications - CEDAR ADA ..................................................................... 16
Specications - CEDAR HDA ....................................................................17
Licence and Limited Warranty ...................................................................18
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Page 5
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. If it is brought directly
from a cold environment into a warm one, moisture may condense inside it.
Always allow it to reach ambient temperatures naturally before connecting
the mains power.
n Installation site
To maintain reliability and prolong operating life, observe the following:
n
the temperature should be maintained between 5° and 30° Celsius
n
relative humidity should be in the range 30% to 80% non-condensing
n
strong magnetic elds should not exist nearby.
Do not subject the unit to strong sunlight, excessive dust, mechanical
vibration or periodic shocks. It is not susceptible to excessive heat build-
up, but should be installed away from heat sources such as radiators and
audio devices that produce large amounts of heat.
n Mains voltage and Earthing (Grounding)
Before connecting to mains power, ensure that the voltage selector is set
to the correct voltage for the local mains supply, and that the fuse is of the
correct rating, as indicated on the rear panel. The unit must be earthed
to ensure a safe operating environment and to provide electromagnetic
shielding.
n Connections
Turn off the power to all equipment before making any connections.
n Cleaning
Clean the unit only with a dry cloth. Never use abrasive pads or liquid
cleaners such as alcohol or benzene.
n Damage requiring service
The unit contains no user-serviceable parts and should not be opened by
unauthorised personnel. It should be returned to qualied service agents
when it has been exposed to liquids, when it fails to function correctly,
when it has been dropped, or when the case is damaged.
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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 user-
selectable rate: 32kHz, 44.1kHz, 48kHz, 64kHz, 88.2kHz or 96kHz.
Slave Mode
If a digital signal is present at the selected digital input, the ADA synchronises to it.
If no such signal is present, no output is generated.
Auto Mode
If a digital signal is present at the selected digital input, the ADA synchronises to
it. If no such signal is present, the ADA uses its internal master clock at the user-
selected sample rate.
Auto Lock Mode
This operates in the same manner as Auto Mode except that, if no digital signal
is present, the ADA uses its internal master clock running at the most recently
synchronised sample rate.
When operating in any other than Master Mode, the front panel power LED will
ash whenever the ADA is not synchronised to an incoming digital signal.
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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. Both outputs are active
at all times. There are also buttons to select the AES/EBU or SPDIF input or output
for the D/A and A/D sections.
You may dene the channel status bits embedded within the digital audio.
For sample rates of 32kHz, 44.1kHz and 48kHz, the status bits can be set to
Professional or Consumer mode. For sample rates above 48kHz, the status bits
will be forced to Professional mode because the ADA does not support Consumer
mode at these rates.
Front Panel LED
The LED on the front panel is normally lit to indicate that power is present. Flashing
indicates either (i) a loss of digital input or (ii) that the unit is being calibrated.
Block Diagram
Gain
Digital Send
Select
ADC
AES
Tr ansmitter
Digital Source
Select
AES
Receiver
Frequency
Select
Master
Clock
Generator
Digital Input
AES/EBU
SPDIF
DAC
L
L
L
L
R
R
R
R
Consumer
Unbalanced
Digital Output
Analogue Output
Consumer
Unbalanced
Professional
Balanced
Recovered
Clock
Professional
Balanced
Analogue Input
Select
Analogue Input
Gain
AES/EBU
SPDIF
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ADA: REAR PANEL CONNECTIONS AND
OPERATION
Inputs
XLR Analogue Inputs (Left and Right)
The XLR 3-pin sockets used for the analogue left and right channel inputs are
electronically balanced and have an impedance of greater than 10kΩ bridging.
Each XLR has the following connections:
n
Pin 1: Screen.
n
Pin 2: Signal +ve (hot)
n
Pin 3: Signal -ve (cold)
RCA Phono Inputs (Left and Right)
The left and right RCA (phono) analogue inputs are unbalanced and have an
impedance of greater than 20kΩ.
Input Level Adjustment
The input gain can be adjusted individually for the left and right channels using
the DIP switches and the preset potentiometers accessible on the rear panel. The
input gain can be set such that signals of +12, +18 or +24dBu generate full-scale
signals in the digital domain. Individual preset controls provide a further ± 3dB to
give an input level range of +9dBu to +27dBu.
The consumer input on the phono connector has a further gain of 10dB to provide
an input level range of -1dBu to +17dBu.
Input Level Settings (dB) Output Level Settings (dB)
Switch +12 +18 +24 Switch +12 +18 +24
1 OFF ON ON 3 OFF ON ON
2 OFF OFF ON 4 OFF OFF ON
S/PDIF
AES/EBU
ANALOGUE INPUTS ANALOGUE OUTPUTS
L R
LEVEL
CAUTION
:
Disconnect the mains supply before removing the equipment covers.
DIGITAL OUTPUTSRIGHTLEFT
R
FREQUENCIES
AND SYNC
MODES
230V 100mA
115V 200mA
FUSE
CEDAR ADA CONVERTER
L
DIGITAL INPUTS
RIGHT
S/PDIF
LEFT
This product must be earthed
AES/EBU
AES/EBU OUTPUT
AES/EBU INPUT
L
R
STATUS
FULL SCALE
dB SETTINGS
INPUT
SELECT
115V - 230V
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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.
n
Pin 2: Signal +ve (hot)
n
Pin 3: Signal -ve (cold)
RCA phono Outputs (Left and Right)
The RCA (phono) outputs are unbalanced and have an output impedance of less
than 75Ω.
Output Level Adjustment
The output gain can be adjusted individually for the left and right channels
using the rear panel DIP switches. Each output gain can be set such that a full-
scale digital output provides +12, +18 or +24dBu output on the analogue XLR
connectors.
The level at the unbalanced output is 10dB lower than at the balanced output.
AES/EBU Output
The digital output XLR 3-pin socket has an impedance of 110Ω, and output signals
comply with IEC 60958. The socket has the following connections:
n
Pin 1: Screen.
n
Pin 2: Signal +ve (hot)
n
Pin 3: Signal -ve (cold)
SPDIF Output
The SPDIF output has an impedance of 75Ω.
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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.
The wordlength for the A/D conversion can be set to 24, 20 or 16 bits. When the
signal is truncated from 24 bits, a psychoacoustic lter is applied to maintain
optimum signal quality.
These settings are summarised by the following tables:
Switch Status Meaning
1 ON PROFESSIONAL
1 OFF CONSUMER
2 ON DE-EMPHASIS AUTO
2 OFF DE-EMPHASIS OFF
Switch Wordlength
16-bit 20-bit 24-bit
3 OFF OFF ON
4 OFF ON ON
All current CEDAR digital processors are 24-bit, so we advise you to leave the
wordlength at 24 bits.
Digital Select Buttons
These buttons allow you to switch between AES/EBU (button out) and SPDIF
(button in) for each of the digital input and output.
Analogue Select Button
This button switches the analogue input between the balanced (button out) and the
unbalanced (button in) connectors.
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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:
n
Master Sync Mode (Switch positions 0–5)
The digital output sample rate is set by and locked to the internal clock
generator. No sync signal is used.
n
Auto Sync Mode (Switch positions 6–B)
The digital output sample rate follows the digital input. When a digital input
signal is not present, the output sample rate is set by and locked to the
internal clock generator at the frequency determined by the switch position.
n
Auto-Lock Sync Mode (Switch position C)
No output is generated until lock with a digital input signal is achieved. The
digital output sample rate then follows the digital input. If the digital input
signal is removed then the output sample rate will be set by and locked
to the internal on-board clock generator at the frequency closest to the
previous digital input.
n
Slave Sync Mode (Switch position D)
The digital output sample rate follows the digital input. When a digital input
signal is not present the digital output is turned off.
The following table summarises this. It shows the sample rate generated by the
internal clock in Master and Auto Sync modes.
FREQUENCIES AND SYNC MODES
kHz 32 44.1 48 64 88.2 96
MASTER 0 1 2 3 4 5
AUTO 6 7 8 9 A B
AUTOLOCK = C SLAVE MODE = D
Test/Calibration Mode
The calibration cycle calibrates the gain and the zero reference of the A/D
converter. For optimum performance, the ADA should be calibrated after you
change the Gain settings, ideally after a 10-15 minute settling period.
To calibrate the unit, set the rotary FREQUENCIES AND SYNC MODES switch to
position “F”. The power LED on the front panel will ash quickly for 2 – 3 seconds
and will illuminate fully when the unit is calibrated. Once calibration is complete,
reset the rotary switch to the position that you require.
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HDA: INTRODUCTION
The CEDAR HDA headphone amplier 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. A button located on the
rear panel determines which input is active, and de-emphasis on the output can
be controlled via a dipswitch. If de-emphasis is selected, the HDA will decode
50/15µs emphasis when indicated by the status bits in the incoming digital audio.
Block Diagram
Source
Select
AES
Receiver
Digital Input
AES/EBU
SPDIF
DAC
Audio
output
amp
Stereo
output
jack
x6
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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 specication.
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.
Status Select Switches
Switch Status Meaning
1 ON DE-EMPHASIS AUTO
1 OFF DE-EMPHASIS OFF
2 Reserved
3 Reserved
4 Reserved
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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.
WARNING
Use of headphones at high volume or for long periods can cause permanent
hearing damage. When connecting and using headphones, please ensure
that operating conditions are safe. If in doubt, please consult an audiologist for
guidance.
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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:
Electromagnetic Compatibility:
EN55103-1: 1997
Limits of disturbance for audio apparatus for professional use. For use in
environments 1 to 4.
EN55103-2: 1997
Immunity requirements for audio apparatus for professional use. For use in
environments 1 to 4.
Safety:
EN60950: 1992
Safety of Information Technology Equipment, Including Electrical Business
Equipment.
Page 16
SPECIFICATIONS
CEDAR ADA:
A/D Connections
Analogue Inputs: 2 x XLR 3-pin (balanced) (L & R)
2 x RCA phono (unbalanced) (L & R)
Digital Outputs: 1 x AES/EBU XLR 3-pin plug
1 x SPDIF RCA phono socket
A/D Audio Specication
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 gain (L and R adjust)
Signal to Noise: Better than 109dBfs (RMS A-weighted at 24bit)
Dynamic Range: >110dB
D/A Connections
Digital Inputs: 1 x AES/EBU XLR 3-pin socket
1 x SPDIF RCA phono
Analogue Outputs: 2 x XLR 3-pin male (balanced) (L & R)
2 x RCA phono (unbalanced) (L & R)
D/A Audio Specication
Max Output Level: +24dBu (balanced outputs)
Max Output Level: +14dBu (unbalanced outputs)
Output Impedance: <50Ω (balanced outputs)
Output Impedance: <75Ω (unbalanced outputs)
Dynamic Range: >100dB
Output Level (bal): User selectable 12dBu, 18dBu or 24dBu
Output Level (unbal): User selectable 2dBu, 8dBu or 14dBu
Page 17
CEDAR HDA:
D/A Connections
Digital Inputs: 1 x AES/EBU XLR 3-pin socket
1 x SPDIF RCA phono
D/A Audio Specication
Sampling Frequencies: 30kHz – 100kHz
Dynamic Range: >100dB
Outputs
Headphones: 6 x ¼” (6.35mm) A/B gauge 3-pole stereo jack sockets
Power: 150 mW into 32Ω - 600Ω (each ouput)
Maximum Output Level: +12dBu
Headphone Gain: -80dBu to +12dBu
Common:
Mains Power
Mains Input: IEC, 110-120VAC or 220-240VAC switchable, 50-60Hz
Consumption: 10W max
Physical
Dimensions 480mm (W) x 108mm (D) x 44mm (H) (nominally 1U)
Dimensions (Boxed) 530mm (W) x 205mm (D) x 60mm (H)
Weight 2.2kg (Gross) 1.6kg (Net)
CEDAR Audio Ltd reserves the right to alter specications without notice. E&OE.
Page 18
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
amplier;
‘this Document’ means this Licence and Limited Warranty.
2. ISSUE AND USE OF THE SYSTEM
2.1 The terms and conditions of this Document are implicitly accepted by any person or body corporate
who shall at any time use or have access to the System, and are effective from the date of supply of
the System by CEDAR Audio Limited to its immediate customer.
2.2 The Company hereby grants to the Licensee and the Licensee agrees to accept a
non-exclusive right to use the System.
3. PROPERTY AND CONFIDENTIALITY
3.1 The System contains condential information of the Company and its suppliers and all copyright, trade
marks, trade names, styles and logos and other intellectual property rights in the System including
all documentation and manuals relating thereto are the exclusive property of the Company and its
suppliers. The Licensee acknowledges that all such rights are the property of the Company and its
suppliers and shall not question or dispute the ownership of any such rights nor use or adopt any
trading name or style similar to that of the Company and/or its suppliers.
3.2 The Licensee shall not attempt to reverse engineer, modify, copy, merge or transcribe the whole or any
part of the System or any information or documentation relating thereto.
3.3 The Licensee shall take all reasonable steps to protect the condential information and intellectual
property rights of the Company and its suppliers.
4. LIMITED WARRANTY AND POST-WARRANTY OBLIGATIONS
4.1 The Company warrants that the System will perform substantially in accordance with the appropriate
section of this manual for a period of one year from the date of supply to the Company‘s immediate
customers.
4.2 The Company will make good at its own expenses by repair or replacement any defect or failure that
develops in the System within one year of supply to the Company‘s immediate customer.
4.3 The Company shall have no liability to remedy any defect, failure, error or malfunction that arises as a
result of any improper use, operation or neglect of the System, or any attempt to repair or modify the
System by any person other than the Company or a person appointed with the Company‘s prior written
consent.
4.4 In the case of any defect or failure in the System occurring more than twelve months after its supply
to the Company‘s immediate customer the Company will at its option and for a reasonable fee make
good such defect or failure by repair or replacement (at the option of the Company) subject to the
faulty equipment having rst been returned to the Company. The Company will use reasonable efforts
to return repaired or replacement items promptly, all shipping, handling and insurance costs being for
the account of the Licensee.
4.5 The above undertakings 4.1 to 4.4 are accepted by the Licensee in lieu of any other legal remedy
in respect of any defect or failure occurring during the said period and of any other obligations or
warranties expressed or implied including but not limited to the implied warranties of saleability and
tness for a specic purpose.
4.6 The Licensee hereby acknowledges and accepts that nothing in this Document shall impose upon the
Company any obligation to repair or replace any item after a time when it is no longer produced or
offered for supply by the Company or which the Company certies has been superseded by a later
version or has become obsolete.
Page 19
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, res, 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. WAIVER
The waiver by either party of a breach of the provisions hereof by the other shall not be construed as a
waiver of any succeeding breach of the same or other provisions, nor shall any delay or omission on the part
of either party to exercise any right that it may have under this Licence operate as a waiver of any breach or
default by the other party.
7. NOTICES
Any notices or instruction to be given hereunder shall be delivered or sent by rst-class post or telecopier to
the other party, and shall be deemed to have been served (if delivered) at the time of delivery or (if sent by
post) upon the expiration of seven days after posting or (if sent by telecopier) upon the expiration of twelve
hours after transmission.
8. ASSIGNMENT AND SUBLICENSING
The Licensee may at his discretion assign the System and in doing so shall assign this Licence its rights and
obligations to the purchaser who shall without reservation agree to be bound by this Licence. The original
Licensee and any subsequent Licensees shall be bound by the obligations of this Licence in perpetuity.
9. LIMITATION OF LIABILITY
The Company‘s maximum liability under any claim including any claim in respect of infringement of the
intellectual property rights of any third party shall be, at the option of the Company either:
(a) return of a sum calculated as the price received for the System by the Company from its immediate
customer depreciated on a straight line basis over a one year write-off period; or
(b) repair or replacement of those components of the System that do not meet the warranties contained
within this Document.
The foregoing states the entire liability of the Company to the Licensee.
10. CONSEQUENTIAL LOSS
Even if the Company has been advised of the possibility of such damages, and notwithstanding anything
else contained herein the Company shall under no event be liable to the Licensee or to any other persons for
loss of prots or contracts or damage (whether direct or consequential) arising in connection with the System
or any modication, variation or enhancement thereof and including any documentation or data provided by
the Company or for any other indirect or consequential loss.
11. ENTIRE AGREEMENT
The Company shall not be liable to the Licensee for any loss arising in connection with any representations,
agreements, statements or undertakings made prior to the date of supply of the System to the Licensee.
12. TERMINATION
This Licence may be terminated forthwith by the Company if the Licensee commits any material breach
of any terms of this Licence. Forthwith upon such termination the Company shall have immediate right of
access to the System for the purpose of removing it.
13. SEVERABILITY
Notwithstanding that the whole or any part of any provision of this Document may prove to be illegal or
unenforceable the other provisions of this Document and the remainder of the provision in question shall
remain in full force and effect.
14. HEADINGS
The headings to the Clauses are for ease of reference only and shall not affect the interpretation or
construction of this Document.
15. LAW
This Document shall be governed by and construed in accordance with English law and all disputes
between the parties which cannot be resolved by negotiation shall be determined by arbitration in England
in accordance with the Arbitration Act 1950 and 1979.
Page 20
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.com
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