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Block Diagram

UNBALANCED LINE OUTPUT AMPLIFIER

UNBALANCED ANALOG INPUT

BALANCED ANALOG INPUT

BALANCED INPUT AMP

UNBALANCED INPUT AMP

2-CHANNEL

2-CHANNEL line 1

HEADPHONE OUTPUTS

INPUT SELECT

CROSSFEED

LINE OUTPUT LEVEL CONTROL

HEADPHONE OUTPUT LEVEL CONTROL

UNBALANCED ANALOG OUTPUT

CROSSFEED ENABLE

TRANSIMPEDANCE HEADPHONE AMPLIFIER

MONO

LINE OUTPUT LEVEL CONTROL

2-CHANNEL line 2

BALANCED LINE OUTPUT AMPLIFIER

BALANCED ANALOG OUTPUT

BALANCE

LEVEL

MUTE

ANALOG INPUTS

DIGITAL INPUTS

OUTPUTS

DAC

INPUT SELECT

AES INPUT

AES3 RX

S/PDIF INPUT

TOSLINK INPUT

CLOCK

AUDIO

32-bit / 384kHz DSD 64x DSD 128x

USB

module

s-Lock PLL

Master clock

DOP

FIXED DAC OUTPUT

Содержание m920

Страница 1: ...Owner s Manual Rev B all contents Grace Design Lunatec LLC www gracedesign com 303 823 8100 m920 High Resolution Monitoring System ...

Страница 2: ...ments Grace Design has been building superlative quality professional audio products since 1995 The technol ogy developed for the m920 has evolved through a process of extensive listening testing and careful re finement Regardless of what type of monitoring you do your m920 will faithfully serve as an invisible link between your source audio and your headphones or speaker systems We sincerely hope...

Страница 3: ...r electrical shock hazard SERVICE INFORMATION The Grace Design m920 contains no user service able components Contact Grace Design for repair and upgrade information In the event that your Grace Design m920 needs to be returned to the fac tory contact us for a return authorization number m920 Key Features Stereo analog inputs balanced 4dBu XLR and unbalanced 10dBv RCA Ultra low distortion 32 bit 38...

Страница 4: ... on parts and labor m920 Front Panel Controls Features FS 44 48 INPUT DSD AES BAL UNBAL S PDIF TOS USB GRACE DESIGN VOLUME sLock 2x 4x 8x xfeed 920 HP L1 L2 PHONES high resolution monitoring system 1 3 4 5 6 8 9 2 7 10 1 ILLUMINATED POWER SWITCH illuminates white when unit is powered on 2 ROTARY INPUT SELECTOR SWITCH selects be tween all available inputs 3 S LOCK INDICATOR LED illuminates when s L...

Страница 5: ...eve something is missing contact your Grace Design dealer and they will make sure you re taken care of SAVE YOUR BOX We strongly encourage you to save the box and shipping materials supplied with your m920 They are specially designed to properly protect these valuable components and in the unlikely event that you need to return them for service only these OEM shipping materials can ensure their sa...

Страница 6: ...ondition In the event that line voltage drops below 85 VAC for 100 120 VAC or 170 VAC 200 240VAC the m920 will switch into low voltage detection mode In this mode both headphone and line outputs are muted and the 7 segment led will begin to flash The m920 will automatically return to the previous operating state when proper line volt age is restored POWER UP SEQUENCE The m920 s headphone outputs a...

Страница 7: ...uts are provided via two TRS jacks These outputs should be connected to powered speakers a preamplifier or power amplifiers using standard balanced cables Connection to an unbal anced input is also possible See diagrams below for proper termination pin 3 pin 1 pin 2 TIP RING SLEEVE Balanced Input XLR Balanced Output 1 4 TRS SHIELD HOT GND RING IS OPEN TIP RING SLEEVE Unbalanced Input RCA Balanced ...

Страница 8: ...will pose their own set of complications in setting up the m920 as the audio playback device In the event that plug and play operation does not occur you will need to look at some specific setup variables for your player and OS In this case we will direct you to a very well written and comprehensive document by our friend and colleague Charles Hanson from Ayre Acoustics http www ayre com usb htm T...

Страница 9: ...ll extinguish The m920 features a second PLL in addition to the s Lock circuit This circuit provides a wide bandwidth lock range and achieves excel lent recovered clock jitter performance even when s Lock is inactive Note that in USB mode the m920 is the clock master so there is no need to lock to an incoming signal About x Feed crossfeed When listening to loudspeakers in a room your left ear hear...

Страница 10: ...hed the output you wish to adjust push the encoder again to enter the balance setting When no balance offset has been made both the left and right speaker symbols are shown in the 7 segment display Turning the rotary encoder clockwise results in a balance adjust to the right This will be indicated by the right facing speaker symbol changing to the corresponding balance offset value Turning the rot...

Страница 11: ... complete details on how to configure your computer for playback over USB please refer to the computer setup chapter of this manual To change this setting Push and hold the rotary encoder to enter the setup menu Now rotate the encoder until you reach the USB class select menu item indicated by either the U1 or the U2 symbol in the 7 segment display Push and release the encoder to toggle between an...

Страница 12: ...e setup menu LEVEL OFFSET ADJUST With three independently controlled analog out puts headphones line 1 and line 2 the m920 is designed to function as a high performance monitor controller for the professional studio or any type of playback scenario To enhance its flexibility in inte grating into any playback setup each output level can be offset by 9 5 dB in 5 dB steps This allows matching of loud...

Страница 13: ... phase brick wall filter It has a steep roll off to prevent any high frequency signals from causing aliasing artifacts It also causes a con siderable amount of pre ringing and post ringing at the Nyquist frequency when passing transient information This filter is great for looking at con verter performance on a test bench where it might be subject to artificially high amplitude signals near 20kHz ...

Страница 14: ...en rotate the encoder until you reach the two line output mode options as indicated by the letters L1 or L2 Push and release the encoder to toggle between either mode which again we be indicated by the letters L1 or L2 L1 is what refer to as grouped operation where both line outputs are selected and adjusted together in unison L2 is what we call round robin where each line output is selected and a...

Страница 15: ...UP Pushing this button during normal operation toggles between the 3 available outputs phones line 1 and line 2 The newly selected output indicator LED will illuminate and its corresponding level will be displayed on the 7 segment display Pushing and holding this button enters the m920 setup menu From here you can control the setup menu in the same way as from the front panel volume encoder only w...

Страница 16: ...NTER button only with the m920 To disable muting simply press the PLAY PAUSE button again The output will return to the current level setting and the display will return to solid In addition to pushing the mute button mute can be turned off by making any volume change on remote control or on the m920 itself LEFT CROSSFEED Pressing this button toggles the x feed status on the m920 The current x fee...

Страница 17: ...balanced line output of the L1 can be configured as a fixed DAC output In this configuration the selected DAC source is output on the L1 connector without passing through the attenuator circuitry This provides the purest signal path for the most critical DAC applications and prevents accidental changes in volume balance etc Caution should be taken when using this operating mode as full amplitude s...

Страница 18: ...power amps that are connected to the m920 before proceeding with the firmware update 1 Connect the m920 to the PC via USB and turn on the m920 2 Start the XMOS USB Audio ST Firmware Upgrade application If the m920 is properly connected the Upgrade window should display Device opened If there is a problem with the connection the Upgrade window will display No device found Please plug in the device ...

Страница 19: ... m920 will display UF on the 7 segment display to indicate that it is Updating Firmware Do not interrupt the unit or disconnect the USB during this sequence The update process may take a few minutes Once completed the new firmware version will be displayed on the 7 segments At this time power cycle the m920 to return to normal operation Should an error occur during the update process an error code...

Страница 20: ...TROL HEADPHONE OUTPUT LEVEL CONTROL UNBALANCED ANALOG OUTPUT CROSSFEED ENABLE TRANSIMPEDANCE HEADPHONE AMPLIFIER MONO LINE OUTPUT LEVEL CONTROL 2 CHANNEL line 2 BALANCED LINE OUTPUT AMPLIFIER BALANCED ANALOG OUTPUT BALANCE LEVEL MUTE ANALOG INPUTS DIGITAL INPUTS OUTPUTS DAC INPUT SELECT AES INPUT AES3 RX S PDIF INPUT TOSLINK INPUT CLOCK AUDIO 32 bit 384kHz DSD 64x DSD 128x USB module s Lock PLL Ma...

Страница 21: ...ne Out 20dBu 100k Ohm load 0 00075 ATTENUATOR Channel matching 0 05dB Attenuator Range 97 5dB OUTPUT NOISE FLOOR BALANCED INPUT Balanced Output volume at maximum 22 22kHz 93dBu Balanced Output volume at minimum 22 22kHz 99dBu Unbalanced Output volume at maximum 22 22kHz 103dBu Unbalanced Output volume at maximum 22 22kHz 105dBu VOLUME SETTINGS FOR UNITY GAIN balanced in balanced out 95 unbalanced ...

Страница 22: ...ce at its option any defective parts or repair defective workmanship without charge provided the customer has appropriate proof of purchase and that the product has its original factory serial number 4 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 ...

Страница 23: ...page23 Manual Revisions Revision Page Change Date Initials A all Initial release 02 15 2014 edg B 13 added minimum phase filter information 4 2 14 edg ...

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