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Welcome
Thanks for purchasing the Grace Design m903 reference headphone amplier / DAC / monitor controller. The m903 rep-
resents a powerful combination of pristine audio performance, robust mechanical construction and steadfast reliability.
While we strive to build all our products to be simple to setup and intuitive to operate, we do suggest that you spend a
little time familiarizing yourself with the features and operational functions outlined in this manual. Doing this will make
your experience with the m903 more productive and enjoyable.
In the event that you encounter any technical or operational diculties with this or any Grace Design product, please
feel free to contact us at 303-443-7454. Our oce hours are from 9 to 5, Monday through Friday, MST. Or you can email
questions to: info@gracedesign.com.
Also, please remember to visit our website www.gracedesign.com for the latest Grace Design product information,
owner’s manuals and technical documents.
Grace Design has been building audiophile quality products since 1995. The technology developed for the m903 has
evolved through a process of extensive listening, eld testing and careful renement. Regardless of what type of moni-
toring you do, your m903 will faithfully serve as an invisible link between your source audio and your headphones or
speaker systems. We sincerely hope it helps you achieve a new level of excellence in your work!
Contents
Important Safety Information 3
m903 Key Features 4
m903 Frontpanel Controls / Features 4
m903 Rearpanel 5
Unpacking and Installing your m903 5
Powering up the m903 6
Power-Up Sequence 6
Input Connections 7
Output Connections 7
Selecting an Input Source 7
m903 USB Input and Computer Audio Conguration 8
Accessing And Using The Setup Menu 9
Infrared Wireless Remote Control Operation 13
Block Diagram 14
Specs 15
Cleaning and Maintenance 16
Warranty Information 16
Manual Revisions 17
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