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User Manual for Grace Design m900 Compact, Portable Headphone Amp, DAC, and Preamp Click to enlarge the picture
Contents of the user manual for the Grace Design m900 Compact, Portable Headphone
- Product category: DACs Grace Design
- Brand: Grace Design
- Description and content of package
- Technical information and basic settings
- Frequently asked questions – FAQ
- Troubleshooting (does not switch on, does not respond, error message, what do I do if...)
- Authorized service for Grace Design DACs
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User manual for the Grace Design m900 Compact, Portable Headphone contain basic instructions
that need to be followed during installation and operation.
Before starting your appliance, the user manual should be read through carefully.
Follow all the safety instructions and warnings, and be guided by the given recommendations.
User manual is an integral part of any Grace Design product,
and if it is sold or transferred, they should be handed over jointly with the product.
Following the instructions for use is an essential prerequisite for protecting
health and property during use, as well as recognition of liability on the part of the manufacturer
for possible defects should you make a warranty claim. Download an official Grace Design user manual in which you will find instructions on how to install, use, maintain and service your product.
And do not forget – unsuitable use of a Grace Design product will considerably shorten its lifespan!
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Product description The Grace Design m900 is a compact, portable headphone amplifier, DAC, and preamp, well suited for audio professionals, music enthusiasts, or anyone looking for transparent playback from USB, S/PDIF, or TOSLINK sources. For small DAW setups, the m900 provides the same analog and DAC quality as Grace Design's large monitor controllers, but in a rugged, portable, and surprisingly affordable unit.
The heart of the Grace Design m900 features the latest generation AKM 4490 chip, which includes 32-bit processing and support for sample rates up to 384 kHz or DSD256. 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 enhance any DAW interface with true reference-quality D/A conversion, headphone monitoring, and stereo speaker control.
The intelligent power supply design allows for two power operation modes, Low and High. Low power mode is derived from USB connection 1, which provides bus power along with data, allowing simple operation from a single connection to a computer. High power mode is available by connecting the included 2A USB DC power supply to USB connector 2, which provides additional power for high-impedance headphones.
The Grace Design m900 utilizes trans-impedance amplifier topology coupled to a zero-ohm output impedance driver for headphone performance that is spacious and transparent with a tight, enveloping low end, while the latest generation cross-feed circuit rounds out the design by emulating an acoustic listening environment in the headphones. The Grace Design m900 ships with a 2A USB power supply and two USB Type-B mini-cables (6' and 10'.) -
- USB, S/PDIF and TOSLINK digital inputs, supports up to 192 kHz (TOSLINK up to 96 kHz)
- Asynchronous USB interface for jitter free computer audio playback, supports up to 384 kHz PCM and DSD256
- Dual zero-ohm output impedance headphone outputs
- Unbalanced level controlled outputs via RCA for connecting to a stereo monitor system
- Compact, portable chassis perfect for travel, desktop or studio
- Low power mode via USB Bus power
- High power mode via included USB 2A power supply
- Four different DAC filter settings to tailor playback performance to personal preference
- Simple user setup menu for setup and calibration
- Display: 7-segment LED displays level and setup menu information
- Large rotary encoder for volume control and setup menu navigation
- Made in the USA
- 5-year transferable warranty
UPC: 823821009003 In the Box Grace Design m900 Compact, Portable Headphone Amp, DAC, and Preamp USB Wall Power Supply 2 x USB Type-B Mini Cable: 6' and 10' Limited 5-Year Warranty Table of Contents
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Technical parametersGrace Design A900 Specs | Connectors | Inputs
Digital Inputs: S/PDIF and TOSLINK
USB Power: Micro-USB 5 V, 2 A (high power input)
USB Data: Micro-USB 2.0 (for data, signal, bus power input)
Output
Stereo Line Outputs: RCA (L/R)
Headphone: 2 x 1/4" / 6.35 mm | | Display | 7-segment LED | | THD + N | THD+N 1 kHz, 22 Hz - 22 kHz BW
@1.0 V Out, No Load: <0.002%
@1.0 V Out, 32 Ohms Load: <0.010% | | Intermodulation Distortion | Intermodulation Distortion SMTPE/DIN 4:1 50 Hz, 7 kHz
@1.0 V Out, No Load: <0.008%
@1.0 V Out, 32 Ohms load: <0.009% | | Frequency Response ± 3dB | Fs=96 kHz: 0.5 Hz to 45.9 kHz | | Dynamic Range | 20 Hz to 22 kHz Bandwidth: 112 dB
20 Hz to 22 kHz Bandwidth and A-Weighting Filter: 115 dB | | Output Noise | 20 Hz to 22 kHz, Volume = 0-90: -106 dBV
A-Weighting Filter, Volume = 0-90: -109 dBV
20 Hz to 22 kHz, Volume = 90.5-99.5: -96 dBV
A-Weighting Filter, Volume = 90.5-99.5: -98 dBV | | Crosstalk | 100 Hz: <107 dB
1 kHz: <98 dB
20 kHz: <72 dB | | Attenuation | Attenuation Range: 0 to -99 dB, 0.5 dB steps | | Accuracy | Channel Tracking Accuracy: ±0.05 dB | | Maximum Output Level | Maximum Output Level, No load
Low Power Mode: +14.1 dBV (5.1 V)
High Power Mode: +15.5 dBV (6.0 V) | | Impedance | Headphone Output: 0.08 Ohms
Line Output: 47.5 Ohms | | Lock Range | S/PDIF
44.1 kHz: 43870-45420 Hz
48 kHz: 46590-49220 Hz
88.2 kHz: 87760-90830 Hz
96 kHz: 93520-98430 Hz
176.4 kHz: 175700-181640 Hz
192 kHz: 187050-196380 Hz
TOSLINK
44.1 kHz: 43900-45410 Hz
48 kHz: 46590-49190 Hz
88.2 kHz: 87840-90830 Hz
96 kHz: 93520-97530 Hz
USB Supported Sample Rates: 44.1, 48, 88.2, 96, 176.4, 192, 352.8, 384 kHz | | Power Consumption | Max, High Power Mode: 8.0 W
Max, Low Power Mode: 2.5 W | | Power Mode | Headphone Output Power
Low Power Mode1 Channel Driven
4 Ohms: 80 mW
8 Ohms: 140 mW
16 Ohms: 310 mW
20 Ohms: 350 mW
32 Ohms: 600 mW
50 Ohms: 560 mW
300 Ohms: 83 mW
600 Ohms: 40 mW
2-Channels Driven
4 Ohms: 22 mW
8 Ohms: 45 mW
16 Ohms: 90 mW
20 Ohms: 100 mW
32 Ohms: 175 mW
50 Ohms: 280 mW
300 Ohms: 83 mW
600 Ohms: 40 mW
High Power Mode1 Channel Driven
4 Ohms: 925 mW
8 Ohms: 1800 mW
16 Ohms: 1900 mW
20 Ohms: 1575 mW
32 Ohms: 1020 mW
50 Ohms: 680 mW
300 Ohms: 115 mW
600 Ohms: 57 mW
2-Channels Driven
4 Ohms: 240 mW
8 Ohms: 490 mW
16 Ohms: 940 mW
20 Ohms: 1030 mW
32 Ohms: 950 mW
50 Ohms: 650 mW
300 Ohms: 115 mW
600 Ohms: 57 mW | | Dimension | 4.0 x 5.3 x 1.8" / 101.6 x 133.4 x 45.7 mm | | Weight | Not specified by manufacturer | | | | Package Weight | 2.5 lb | | Box Dimensions (LxWxH) | 10.2 x 10.2 x 4.5" |
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