PAGE 1
1 Welcome
The m900 represents a new level of performance for
compact, personal audio playback devices. With zero
Ohm output impedance headphone outputs and a
remarkable USB power supply design, the m900 delivers
incredible playback performance with compact, stylish
ergonomics.
Setup and operation is of the m900 simple. While
mostly plug and play, there are a few operational con-
cepts that are helpful to understand. We encourage you
to read this manual thoroughly to familiarize yourself
with the unit so you can use and enjoy it to its fullest
extent.
If you have any questions, please visit our website for
more information:
www.gracedesign.com
, or feel free to
call us directly at 1.303.823.8100. We’d love to hear from
you!
2 Connections and Controls
2.1 REAR PANEL
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3
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4
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1 - Line Outputs
Unbalanced, level controlled line outputs via a pair
of gold plated RCA phono jacks. These outputs are
designed to connect to a power amp, powered speakers,
preamps, or headphone amps. When headphones are
connected to the right hand front panel jack, the line
output signal is muted.
2 - S/PDIF Input
Accepts up to 192kHz, 24 bit PCM digital audio signal.
Automatic de-emphasis equalization. The m900 setup
menu contains an input select option that toggles be-
tween the USB, S/PDIF or TOSLINK input. See the Setup
Menu section in this manual for more setup information.
3 - TOSLINK Optical Input
Accepts up to 96kHz, 24 bit PCM digital audio signal.
Automatic de-emphasis equalization. The m900 setup
menu contains an input select option that toggles be-
tween the USB, S/PDIF or TOSLINK input. See the Setup
Menu section in this manual for more setup information.
4 - USB Connector #2 - High Power Input
Use this power connection to operate the m900 in
High Power mode. This connector carries only DC power
and no USB data. Once the included low noise 2A USB
power supply is plugged into this input, the m900 will
enter High Power mode (indicated by “HP” on the 7-seg-
ment display).
5 - USB Connector #1 - Data / Signal / Bus Power Input
Asynchronous USB 2 interface for bit perfect, zero
interface induced jitter DAC operation. Accommodates
44.1kHz to 384kHz PCM and 64X - 256X DSD. Driverless
Contents
1 Welcome
1
2 Connections and Controls
1
2.1 REAR PANEL
1
2.2 FRONT PANEL
2
2.3 TOP PANEL
2
3 Operation
2
4 Using the Setup Menu
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5 Specifications
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6 Cleaning and Maintenance
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7 Warranty Information
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