Lucid SRC9624 User manual

SRC9624
High Definition Sample Rate Converter
User’s Guide

TABLE OF CONTENTS
Section 1 Introduction 1
Section 2 Operator Safety Summary 2
Section 3 Fast Setup 4
Section 4 Product Description
SRC9624 Front Panel 7
SRC9624 Rear Panel 8
Section 5 Using the SRC9624 9
Section 6 Specifications 15
Section 7 Warranty and Service 16
Section 8 Declaration of Conformity 17
Rev A.01, March 2000
Part number 53SR960A01
Specifications subject to change without notice.
©2000 Lucid. All rights reserved.
Lucid is a registered trademark of Symetrix, Inc.
Mention of third-party products is for informa-
tional purposes only and constitutes neither an
endorsement nor a recommendation. Lucid
assumes no responsibility with regard to the
performance or use of these products.
Under copyright laws, no part of this manual may
be reproduced or transmitted in any form or by
any means, electronic or mechanical, including
photocopying, scanning, recording, or by any
information storage and retrieval system, without
permission in writing from Lucid.
6408 216th St. SW
Mountlake Terrace, WA 98043
Tel: [phone]
Fax: [phone]
Email: [e-mail]
Web site: www.lucidaudio.com

1
The Lucid SRC9624 High Definition Sample Rate Converter is a two-channel digital audio
sample rate converter intended for playback, mastering, post production, broadcast, or any
application requiring an extremely adaptable sample rate converter of the highest possible
quality.
The SRC9624 supports a range of sample rates and 16-, 20-, and 24-bit word sizes. Using
asynchronous conversion algorithms, it handles any input rate from 30 kHz to 100 kHz, in-
cluding varispeed and common pull-up and pull-down rates. The SRC9624 also supports
single- and dual-wire connections in 96 kHz (high-resolution) digital audio so you can interface
gear using either format. It can also convert two single-wire stereo streams at rates up to 96 kHz
to any standard common output rate, providing you with two sample rate converters in a single
box. Finally, AES11 and word clock external sync capabilities, along with a wide range of
industry-standard internally generated clocks, ensure easy synchronization between almost any
digital audio equipment, whether it’s professional or consumer.
We recommend that you read this manual from cover to cover. Somewhere between the con-
fines of the two covers you should find the answers to most (98%) of your questions, both
technical as well as musical. Please feel free to contact us if you have additional questions,
comments, or suggestions.
Phone:[phone]
Fax:[phone]
WWW: www.lucidaudio.com
Email: [email protected]
INTRODUCTION SECTION 1
SRC9624 Front view.
SRC9624 Rear view.

2
Equipment Markings
The lightning flash with arrowhead symbol within an
equilateral triangle is intended to alert the user of the
presence of uninsulated “dangerous voltage” within the
product's enclosure that may be of sufficient magnitude to
constitute a risk of electric shock to persons.
The exclamation point within an equilateral triangle is
intended to alert the user of the presence of important
operating and maintenance (servicing) instructions in the
literature accompanying the product (i.e. this manual).
Caution To prevent electric shock, do not use the polarized plug
supplied with the unit with any extension cord, receptacle, or other outlet
unless the blades can be fully inserted.
Terms
The following are notational conventions used in this user guide:
Note Identifies information that needs extra emphasis. Supplies extra information to help you to better use
the product.
Caution Identifies information that, if unheeded, may cause damage to the Lucid product or other equipment in
your system.
Warning Identifies information that, if ignored, may be hazardous to your health or that of others.
CAPITALS Controls, switches, or other markings on the product’s chassis.
Important Safety Instructions
Please read and keep these instructions. Follow all warnings and instructions.
Mains Voltage Selection The Lucid SRC9624 uses an auto-sensing power supply and can
operate from 90 to 250 VAC, at 50–60 Hz. Therefore, there is no
need for the user to set the mains voltage prior to use.
Power Source This product is intended to operate from a power source that does
not apply more than 250V rms between the power supply conductors
or between either power supply conductor and ground. A protective
ground connection, by way of the grounding conductor in the power
cord, is essential for safe operation.
Grounding The chassis of this product is grounded through the grounding
conductor of the power cord.To avoid electric shock, plug the power
OPERATOR SAFETY SUMMARY
AVIS: NE PAS OUVRIR
Il ne se trouve a l’interieur aucune piece pourvant entre reparée l’usager.
SEE OWNERS MANUAL.VOIR CAHIER D’INSTRUCTIONS.
S’adresser a un reparateur compétent.
RISQUE DE CHOC ELECTRIQUE
No user serviceable parts inside.Refer servicing to qualified service personnel.
CAUTION
WARNING: TO REDUCE THE RISK OF FIRE OR
ELECTRIC SHOCK DO NOT EXPOSE
THIS EQUIPMENT TO RAIN OR MOISTURE
DO NOT OPEN
RISK OF ELECTRIC SHOCK
SECTION 2

3
cord into a properly wired receptacle before making any connections
to the product. A protective ground connection, by way of the
grounding conductor in the power cord, is essential for safe opera-
tion. Do not defeat the safety purpose of the grounding plug.The
grounding plug has two blades and a third grounding prong. The
third prong is provided for your safety. When the provided plug does
not fit your outlet, consult an electrician for replacement of the outlet.
Danger from If the protective ground connection is lost, all accessible conductive
Loss of Ground parts, including knobs and controls that may appear to be insulated,
can render an electric shock.
Proper Power Cord Use only the power cord and connector specified for the product and
your operating locale. Use only a cord that is in good condition. Protect
the power cord from being walked on or pinched, particularly at plugs,
convenience receptacles, and the point where they exit from the apparatus.
Operating Location Do not operate this equipment under any of the following conditions:
explosive atmospheres, in wet locations, in inclement weather, improper
or unknown AC mains voltage, or if improperly fused. Do not install
near any heat source such as radiators, heat registers, stoves, or other
apparatus (including amplifiers) that produce heat. Unplug this apparatus
during lightning storms or when unused for long periods of time.
Stay Out of the Box To avoid personal injury, do not remove the product covers or panels.
Do not operate the product without the covers and panels properly
installed. Only use accessories specified by the manufacturer. Clean
only with a damp cloth.
User-serviceable parts There are no user serviceable parts inside the SRC9624. In case of
failure, refer all servicing to the factory. Servicing is required when the
SRC9624 has been damaged in any way, such as when a power supply
cord or plug is damaged, liquid has been spilled or objects have fallen
into the apparatus, the apparatus has been exposed to rain or moisture,
does not operate normally, or has been dropped.

4
FAST SETUP SECTION 3
This section discusses getting signals in and out of the SRC9624 and using it.
Digital Input Connections
It is not necessary to connect all of these connectors at any given time. The connectors used or
not used depend on your specific application. The INPUT SOURCE switches let you select the
input source from the three connectors provided.
Connect the AES/EBU input connectors to AES/EBU digital audio sources. For long cable
runs, you should use 110-ohm shielded twisted pair cable.
Connect the Coaxial (S/PDIF) connectors to consumer audio digital outputs. This connector
floats from the chassis ground.
Use the Optical connector to connect to S/PDIF optical digital outputs.
Digital Output Connections
Like the digital inputs, it is not necessary to connect to all of these connectors at once. Use the
ones you need; they are all active at once, and there is no interaction between them.
Connect the AES3 outputs to any AES/EBU receiver. For long cable runs, you should use 110-
ohm shielded twisted pair cable.
Connect the Coaxial (S/PDIF) connectors to consumer audio digital inputs. This connector
floats from the chassis ground.
Use the Optical connectors to connect to a S/PDIF optical digital input.
Sync Connections
The AES11 XLR connector accepts either sync signals or digital audio (of course, the audio is
ignored). You enable this connector via the OUTPUT SAMPLE RATE selector switch. This
input accepts both “black” AES signals (i.e., signals with AES clock info but no audio) as well as
normal AES digital audio signals. In the latter case, the audio is stripped out of the signal,
leaving the clock only. The input accepts sample rates from 30 kHz to 100 kHz.
The WORD IN BNC connector accepts word clock. This input does not terminate. If the
SRC9624 is the last unit in a chain, you must use a tee connector at the input along with a 75-
ohm terminator. The input accepts sample rates from 30 kHz to 100 kHz.
The WORD OUT BNC connector follows the sample rate of the outputs. It is NOT a thru
connection of the WORD IN connector.

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Mode Selection
Each portion of the SRC9624 uses three-position toggle switches to move the selection up or
down. For the inputs, if the digital receiver does not achieve lock (no signal, or bad signal), the
INPUT STATUS LEDs will not illuminate. Once the input locks, the status LEDs display the
status information contained in the input signal.
The toggle switches and their associated LED stacks are designed to allow scrolling down or up
through each user-controllable parameter.
Nonvolatile Memory
Approximately a half second after the last switch change, the LEDs will blink, indicating that
the current configuration has been written to nonvolatile RAM. The next time the unit is
powered up, it will remember its last state and initialize in that configuration.
Routing
The routing switch determines how the inputs connect to the outputs. Choose an appropriate
setting for your application.
Independent The two inputs drive the two outputs. The signals remain separate. The
output sample rate of both outputs depends on the setting of the OUTPUT
SAMPLERATE selector switch.
Distribution The SRC9624 acts as a distribution amplifier, with Input A driving both
outputs.
96 kHz Dual These settings allow the SRC9624 to convert signals to or from the 96 kHz
AES Settings dual-wire AES format.
The first Dual AES mode takes a stereo 96k signal which has been split into 2 mono signals
running at a 48k frame rate, and converts it to 1 stereo signal on 1 wire, at any of the possible
sample rates.
The second Dual AES mode does the opposite. It takes a single wire 96k signal and splits it into
2 wires—1 with left and 1 with right—both running at a 48k frame rate. The output sample
rate should be set to the signal rate in this case (i.e., 96k). If you were to set the output rate to
48k, the signal will actually be sent at a 24 kHz frame rate, a format which is not generally
used.
Input A Source
The INPUT A switch selects the desired source connection for INPUT A. The INPUT A
STATUS LEDs monitor certain bits in the digital audio stream—pro or consumer, and audio

6
or non-audio (e.g., AC3). These bits are fed through the unit to the output. If the selected
input is not present, the input A source LED flashes.
Input B Source
The INPUT B switch selects the desired source connection for Input B, either XLR, coaxial, or
TOSLINK. The INPUT B STATUS LEDs will monitor certain bits in the digital audio
stream—pro or consumer, and audio or non-audio (e.g., AC3). These bits are fed through the
unit to the output. If the selected input is not present, the Input B source LED flashes.
Output Sample Rate
The OUTPUT SAMPLE RATE switch determines the sample rate of the digital audio output
on both outputs A and B. For word clock input, AES11 Sync input and Input A input, the
selected sync source’s LED will flash if a valid clock signal is not present on that connector. For
the internal clock frequencies, the selected sync source’s LED illuminates.
Output Dither
This switch determines the word length of all outputs. None indicates no dithering. Settings of
20-bit or 16-bit indicate that the output signal has been dithered, using triangular PDF dither-
ing, to these word lengths.

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PRODUCT DESCRIPTION - SRC9624 FRONT PANEL SECTION 4
Feature Description
ROUTING LEDs indicate the current signal routing. The toggle switch moves
the selection up or down. There are four routing modes.
Independent Input A drives Output A, Input B drives
Output B.
Distribution Input A drives Output A and Output B.
96 kHz Dual Inputs A and B receive two-wire AES signals at
AES (source) 96 kHz sample rate. The SRC9624 merges the
two signals, and outputs at the selected sample
rate in single-wire format via Output A.
96 kHz Dual Input A receives 96 kHz signal and the SRC9624
AES (receiver) converts it to two-wire format. The outputs appear
on Digital Output A and Digital Output B.
INPUT A STATUS LEDs indicate the settings of the status bits in the signal applied
to Input A. The LEDs illuminate only when the input has locked
on a valid signal.
INPUT A SOURCE LEDs indicate the signal source for Input A. The toggle switch
moves the selection up or down.
INPUT B STATUS LEDs indicate the settings of the status bits in the signal applied
to Input B. The LEDs illuminate only when the input has locked
on a valid signal. The toggle switch moves the selection up or
down.
INPUT B SOURCE LEDs indicate the signal source for Input B. The toggle switch
moves the selection up or down.
OUTPUT SAMPLE LEDs indicate the output sample rate. The output sample rate can
be derived from the sync inputs, Input A, or set to 32 kHz,
44.1 kHz, 48 kHz, 88.2 kHz, or 96 kHz.
OUTPUT DITHER LEDs indicate the output dither setting. The toggle switch moves
the selection up or down. The SRC9624 uses triangular PDF
function dithering. There is no noise shaping.
POWER SWITCH Turns the unit on or off.

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PRODUCT DESCRIPTION - SRC9624 REAR PANEL
IEC POWER Accepts AC mains voltage. The SRC9624 uses a switching power
CONNECTOR supply that automatically adjusts to the applied voltage. Ensure
that your AC mains voltage is between 90–250 VAC, 50–60 Hz.
Sync Connectors
WORD OUT BNC connector. Supplies word clock signal at the same rate as the
output sample rate. This is not a thru-connection to the WORD
IN connector.
WORD IN BNC connector. Accepts word clock signal from an external
source. This is a bridging input (non-terminating). If the SRC9624
is the last unit connected to the word clock cable, the cable must
be terminated. Use a tee connector and a 75-ohm terminator.
AES11 XLR-female connector. Accepts AES11 (AES/EBU) signals. This
could be a sync-only signal or it could be a digital audio signal
(the audio portion is ignored).
Digital Output A and B
The two sets of outputs are driven separately and there is no interaction between the connec-
tors. Connect to any or all, as required by your application. Signals appearing at these outputs
vary according to the setting of the ROUTING selector switch.
OPTICAL (S/PDIF) TOSLINK connector. Carries S/PDIF signal.
COAXIAL (AES3-S/PDIF) BNC* connector. Carries S/PDIF-AES3 signal.
AES3 XLR-male connector. Carries AES3 signal. Long cable runs require
110-ohm shielded twisted-pair cable.
Digital Input A and B
The digital inputs are all separate; any or all may be connected. The actual connector used as
the signal source depends on the setting of the INPUT A SOURCE or INPUT B SOURCE
selector switches. Input A may also be used as a sync or sample rate source.
OPTICAL (S/PDIF) TOSLINK connector. Carries S/PDIF signal.
COAXIAL (AES3-S/PDIF) BNC* connector. Carries S/PDIF-AES3 signal.
AES3 XLR-male connector. Carries AES3 signal. Long cable runs require
110-ohm shielded twisted-pair cable.
*BNC to RCA adapters are included with the SRC9624. Use these adapters if you are
connecting to equipment with RCA/coaxial connectors.
SECTION 4