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Welcome
Thanks for purchasing the Grace Design m903 reference headphone amplifier / 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 difficulties with this or any Grace Design product, please
feel free to contact us at 303-443-7454. Our office hours are from 9 to 5, Monday through Friday, MST. Or you can email
questions to: [email protected].
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, field testing and careful refinement. 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
m903 Frontpanel Controls / Features
Unpacking and Installing your m903
m903 USB Input and Computer Audio Configuration
Accessing And Using The Setup Menu
Infrared Wireless Remote Control Operation
