Source: Official website, Last Accessed: 2017/05/18

The m900 is a portable, desktop friendly, DAC /Headphone amplifier/Preamp combo, designed to give audio professionals and enthusiasts musical and transparent audio playback from USB, S/PDIF or Toslink sources. The company states that for small DAW studio setups, portable laptop editing or mixing rigs, or just pure playback enjoyment, the m900 provides the same analog and DAC quality as their large monitor controllers, but in a rugged, portable and surprisingly affordable unit.
The m900 DAC uses the latest generation AKM 4490 chip, which features 32-bit processing and supports sample rates up to 384kHz PCM or 256x DSD. The USB interface operates in asynchronous mode allowing the m900 to be the clock master which makes the system immune to USB bus jitter. S/PDIF and Toslink inputs allow the m900 to enhance any DAW interface with reference quality D/A conversion, headphone monitoring and stereo speaker control.
An intelligent power supply design allows for two power operation modes - Low and High. Low power mode uses the USB data connector, which provides bus power along with data, allowing the m900 to operate from a single connection to the host computer. High power mode is available by connecting the included 2A USB DC power supply to a second, “power-only”, USB connector, which provides additional power to drive headphones.
The device features USB, S/PDIF and Toslink digital inputs and supports up to 192kHz (Toslink up to 96kHz), while through the asynchronous USB interface, 384kHz PCM and 256x DSD streams are supported. Analog output is through unbalanced RCA, level controlled outputs. The user have access to four different DAC filter settings to tailor playback performance to his personal preference, a simple menu for setup and calibration, a 7-segment LED display for level and setup information and a large rotary encoder for volume control and menu navigation.
According to the information published, transimpedance amplifier topology coupled to a near-zero (0.08) ohm output impedance driver, provides “headphone performance that is incredibly spacious and transparent with a tight, enveloping low end”. Grace Design's latest generation cross-feed circuit simulates an acoustic listening environment in the headphones. Familiar tracks become new again with surprise details, while audio production tasks like tracking, mixing and editing happen faster and easier, the company says.

For more information: http://www.gracedesign.com/

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