Audio Authority 979T User manual

User Manual
Model 979T and 979R
Digital Audio Converters

2
Table Of Contents
1.0 Introduction . . . . . . . . . . . . . . . . . . . . . . . 3
2.0 Checking Package Contents . . . . . . . . . . . . . . . 3
3.0 Installation . . . . . . . . . . . . . . . . . . . . . . . . 4
4.0 Specications . . . . . . . . . . . . . . . . . . . . . . 5
5.0 Limited Warranty . . . . . . . . . . . . . . . . . . . . 6
6.0 Regulatory Compliance . . . . . . . . . . . . . . . . . 7
7.0 Contact Information . . . . . . . . . . . . . . . . . . . 8
WARNINGS
• Read these instructions before installing or using this product.
• To reduce the risk of re or electric shock, do not expose this unit to rain or mois-
ture.
• This product must be installed by qualied personnel.
• Do not open the cover—there are no user-serviceable parts inside.
• Do not expose this unit to excessive heat.
• Install only in dry, indoor locations.
• Clean the unit only with a dry or slightly dampened soft cloth.
LIABILITY STATEMENT
Every effort has been made to ensure that this product is free of defects. Audio
Authority cannot be held liable for the use of this hardware or any direct or indirect
consequential damages arising from its use. It is the responsibility of the user of the
hardware to check that it is suitable for his/her requirements and that it is installed
correctly. All rights are reserved. No parts of this manual may be reproduced or
transmitted by any form or means electronic or mechanical, including photocopying,
recording or by any information storage or retrieval system without the written
consent of the publisher.
Audio Authority reserves the right to revise any of its hardware and software
following its policy to modify and/or improve its products where necessary or
desirable.
Audio Authority and the Double-A Symbol are registered trademarks of Audio
Authority Corp. Copyright June, 2007. All third party trademarks and copyrights are
recognized.

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1.0 INTRODUCTION
Thanks for purchasing this digital audio converter from Audio Authority.
The 979T converts stereo analog audio signals to digital pulse code
modulated audio signals, and the Model 979R converts digital audio
to stereo analog audio signals. These products are useful when audio
equipment to be interconnected does not have matching audio signal
facilities. These converters are also useful when pre-installed audio
wiring requires stereo audio to travel over one coaxial cable.
Each converter houses high-performance audio A-to-D or D-to-A circuitry
in a small, mountable package. The Model 979R accepts 44.1KHz to 192
KHz PCM audio inputs. Model 979T is factory-set for 48KHz output but
also allows 96KHz sample rate to be selected by internal jumper.
Audio Authority offers an extensive line of audio and video switchers,
converters, and distribution amps available for purchase online at
www.audioauthority.com or through authorized dealers.
1.1 FEATURES
• High bandwidth
• Model 979R accepts either coaxial or optical PCM inputs
• Model 979T delivers both coaxial and optical outputs simultaneously
• Nominal digital audio signal is 0.5 volt at 75 ohms
• Nominal analog audio level is 1 volt RMS
• Compact form factor: 1.33 x 3.36 x 4.25 (HxWxD, inches)
2.0 CHECKING PACKAGE CONTENTS
Before attempting to use this unit, please check the packaging and make
certain the following items are contained in the shipping carton:
• Audio Converter
• 12V DC Power Adapter
• User Manual
Note: Please retain the original packing material in case you need
to return the unit. If you nd any items are missing, contact Audio
Authority immediately. Have the model number and invoice available
for reference when you call.

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3.0 INSTALLATION
Before connecting these products, make sure that the signal levels of the
related equipment match the levels specied for the 979 converters:
• Nominal digital audio signal is 0.5 volt at 75 ohms
• Nominal analog audio level is 1 volt RMS
Most consumer audio equipment matches these parameters and will not
cause any problems.
• Connect these converters using high-quality patch cords. Do not
connect cables longer than 20 feet (6m) into or out of these products.
Either optical or coaxial cables may be used on the digital connections.
• If desired, mount the 979R or 979T to a surface using the built-in
mounting holes.
• The Model 979R accepts common sample rates from 44.1 to 192KHz.
If the 96KHz sample rate is required from the Model 979T, contact
Audio Authority Service at 800-322-8346 for instructions.
• Power the converter(s) from the included 12 volt DC power supply and
observe desired performance.
If you encounter difculty, contact the Audio Authority Technical Service
department via email: [e-mail], or call 800-322-8346
or 859-233-4599.
POWER
SUPPLY
ANALOG
INPUTS:
LEFT
AND
RIGHT
DIGITAL
OUTPUTS:
OPTICAL
OR
COAXIAL
POWER
INDICATOR

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4.0 SPECIFICATIONS
Model Number 979R 979T
Analog/Digital D to A converter A to D converter
Digital Input/Output Type Coaxial+optical Coaxial+optical
Input Impedance 75 ohms 47.5K ohms
Min Load Impedance 10K ohms 75 ohms
Multi-channel No (2 channel PCM only) No (2 channel PCM only)
Frequency Response 44.1-192KHz sample rate 48/96KHz sample rate
Agency Approvals FCC, CE FCC, CE
DC Input Connector 5.5 x 2.1mm 5.5 x 2.1mm
DC Input Voltage/Polarity 12V/center positive 12V/center positive
Max DC Input Current 75mA 75mA
Power Supply 571-013 571-013
POWER
INDICATOR
DIGITAL
INPUTS:
COAXIAL
OR
OPTICAL
ANALOG
OUTPUTS:
RIGHT
AND
LEFT
POWER
SUPPLY

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5.0 LIMITED WARRANTY
Should any consumer product from Audio Authority fail due to defects in
materials or workmanship within one year from the date of the original
sale to the end-user, Audio Authority guarantees that we will replace
the defective product at no cost. Freight charges for the replacement
unit will be paid by Audio Authority (ground service only). A copy of
the invoice showing the item number and date of purchase (proof-of-
purchase) must be submitted with the defective unit to constitute a valid
in-warranty claim.
Units that fail after the warranty period has expired may be returned to
the factory for repair at a nominal charge, if not damaged beyond the
point of repair. All freight charges for out-of-warranty returns for repair
are the responsibility of the customer. Units returned for repair must
have a Return Authorization Number assigned by the factory.
This is a limited warranty and is not applicable for products which, in our
opinion, have been damaged, altered, abused, misused, or improperly
installed. Audio Authority makes no other warranties either expressed
or implied, including limitation warranties as to merchantability or tness
for a particular purpose. Additionally, there are no allowances or credits
available for service work or installation performed in the eld by the end
user.
5.1 WARRANTY SERVICE PROCEDURES
If you suspect a product defect, contact Audio Authority’s Technical
Service Department at 800-322-8346 or 859-233-4599 for assistance
in verifying the problem. If a defect or potential defect is suspected, a
replacement unit will be shipped immediately on a defect-exchange basis
and a Return Authorization Number will be issued for the return of the
defective product. Replacement units are sent out at the Manufacturer’s
Suggested Retail Price which is debited to the Customer’s Credit
Card at the time of shipment. Once we receive the defective unit
back at the factory, it will be evaluated under the conditions of this
warranty and if found to be in-warranty, a full credit will be issued to the
Customer’s Credit Card. Return freight charges for the defective unit
are the customer’s responsibility. Please contact our Technical Service
Department for complete details concerning all in and out of warranty
service matters.
We appreciate your condence in our products and services and will
always strive to meet or exceed your needs.

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6.0 REGULATORY COMPLIANCE
The 979T and 979R have been tested for compliance with CE and FCC
rules and regulations. The Power Adaptor/Supply included has been
tested for compliance with UL, CE, and CSA rules and regulations and is
RoHS compliant.
7.0 CONTACT INFORMATION
If you have questions or require assistance with this product in areas
not covered by this manual, please contact Audio Authority using the
information below.
Audio Authority Technical Service
800-322-8346 M-F 8:30 AM to 5:00 PM, EST
International: 859-233-4599 Fax: [phone]
Send email to: [e-mail]
Audio Authority Corporation
2048 Mercer Road
Lexington, Kentucky 40511-1071
USA

2048 Mercer Road, Lexington, Kentucky 40511-1071
Phone: [phone] • Fax: [phone]
Customer Toll-Free USA & Canada: 800-322-8346
www.audioauthority.com
752-565
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