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PAGE 10

5  Specifications

 

THD+N 1kHz, 22Hz-22kHz BW

@1.0V out, no load

<0.002%

@1.0V out, 32 Ohm load

<0.010%

Intermodulation Distortion SMTPE/DIN 4:1 50Hz, 7kHz

@1.0V out, no load

<0.008%

@1.0V out, 32 Ohm load

<0.009%

Frequency Re/-3dB

Fs=96kHz

0.5-45.9kHz

Dynamic Range

20-22kHz bandwidth

112dB

20-22kHz bandwidth and A weighting filter

115dB

Output Noise

20-22kHz, volume=0-90

-106dBV

A weighting filter, volume = 0-90

-109dBV

20-22kHz, volume=90.5-99.5

-96dBV

A weighting filter, volume = 90.5-99.5

-98dBV

Crosstalk

100Hz

<107dB

1kHz

<98dB

20kHz

<72dB

Attenuation Range

0 to -99dB, 0.5dB steps

Channel Tracking Accuracy

+/-0.05dB

Maximum Output Level, No load

Low Power Mode

+14.1dBV (5.1V)

High Power Mode

+15.5dBV (6.0V)

Impedances

Headphone Output

0.08 Ohms

Line Output

47.5 Ohms

Input Lock Range

Sample Rate

Lock Range

S/PDIF

44.1kHz 

43870-45420Hz

48kHz

46590-49220Hz

88.2kHz

87760-90830Hz

96kHz

93520-98430Hz

176.4kHz

175700-181640Hz

192kHz

187050-196380Hz

TOSLINK

 44.1kHz

43900-45410Hz

48kHz

46590-49190Hz

88.2kHz

87840-90830Hz

96kHz

93520-97530Hz

USB supported sample rates

44.1, 48, 88.2, 96, 176.4, 192, 352.8, 384kHz

Power Consumption

Max, High Power mode

8.0W

Max, Low Power mode

2.5W

Dimensions

4” x 5.25” x 1.8”

Headphone Output Power / Low Power Mode

Output Power mW

Load Resistance Ohms

1 Channel Driven

2 Channels driven

4

80

22

8

140

45

16

310

90

20

350

100

32

600

175

50

560

280

300

83

83

600

40

40

Headphone Output Power / High Power Mode

Output Power mW

Load Resistance Ohms

1 Channel Driven

2 Channels driven

4

925

240

8

1800

490

16

1900

940

20

1575

1030

32

1020

950

50

680

650

300

115

115

600

57

57

Summary of Contents for m900

Page 1: ...m900 Headphone Amp DAC Preamp Owner s Manual Revision A 05 06 2017 Grace Design Lunatec LLC 4689 Ute Highway Longmont CO 80503 info gracedesign com www gracedesign com 1 303 823 8100 ...

Page 2: ... 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...

Page 3: ...ply and 2 USB type B mini ca bles one 6 and one 10 If you are missing any of these items please contact us at 1 303 823 8100 Setting UpYour m900 The m900 is designed to sit on your desktop or atop your audio center Its small low profile stature easily fits on any desk or media center furniture Put your unit wherever you like as long as it s within reach The top mounted volume control will sit comf...

Page 4: ...ug is inserted in to the headphone jack of any headphone amplifier there is a brief moment when the output of the amplifier gets shorted to ground If there is music playing when this happens there will be high current flow which will likely cause the supply current to the m900 to rapidly rise above the maximum current which a computer or external USB power supply can deliver If an over current con...

Page 5: ... it needs and the result is a very pleasing simulation of an acoustic space while maintaining the tonality and balance of the original source Computer Configuration The m900 computer audio connection is an asyn chronous USB interface With asynchronous mode USB operation the m900 USB DAC becomes the clock master to which the computer s USB bus is synced The computer is synced to a crystal based aud...

Page 6: ...port htm Under m900 locate and save the driver file titled XMOS Stereo USB Audio Class2 Driver Begin with your m900 disconnected from your com puter Double click on the driver file to run and follow the instructions in the installation dialog 1 Open install dialog 2 Accept terms and click next 3 Choose default location and install ...

Page 7: ...PAGE 6 4 Installation Complete 5 Connect your m900 6 You re ready to go ...

Page 8: ... or USB 2 mode which are selected in the m900 setup menu see using the setup menu below These modes will show up in the OS playback settings differ ently In USB 1 mode the m900 will show up in the OS playback device dialog as m900 In USB 2 mode the m900 will show up in the OS playback device dialog as XMOS USB Audio ...

Page 9: ...dicate that current level does not match the power up level DAC FILTER Changes the response of the digital filter Push and release the encoder to scroll through the filter response modes sharp roll off linear phase For linear phase response and time coherency Fast roll off protects against aliasing distortion from high ampli tude high frequency content Best for recordings that are loud compressed ...

Page 10: ... FS will be displayed for briefly and change to indicate the incoming sample rate 44 1 kHz 48 kHz 88 2 kHz 96 kHz Because the m900 s display is only 2 characters the higher sample rates are abbreviated as 176kHz 192kHz 354kHz 384kHz DSD rates are shown as DSD64 DSD128 DSD256 ...

Page 11: ...0V Impedances Headphone Output 0 08 Ohms Line Output 47 5 Ohms Input Lock Range Sample Rate Lock Range S PDIF 44 1kHz 43870 45420Hz 48kHz 46590 49220Hz 88 2kHz 87760 90830Hz 96kHz 93520 98430Hz 176 4kHz 175700 181640Hz 192kHz 187050 196380Hz TOSLINK 44 1kHz 43900 45410Hz 48kHz 46590 49190Hz 88 2kHz 87840 90830Hz 96kHz 93520 97530Hz USB supported sample rates 44 1 48 88 2 96 176 4 192 352 8 384kHz ...

Page 12: ... repair defective workmanship without charge provided the customer has appropriate proof of purchase and that the product has its original factory serial number In order for Grace Design to provide efficient and timely warranty service it is important that you mail the completed warranty registration card enclosed with all of our products within 10 days of the original date of purchase You may als...

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