GUSTARD DAC-X20 Pro Super Ultimate 2 x ES9028Pro I2S XMOS HiFi DAC 384KHz DSD DOP Decoder

SKU: X20-Pro
Price: US$829.98
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  • Double ES9028PRO,native full balance,a class division line,double power source.
  • The first domestic adaptive master clock technology,two asynchronous and synchronous clock mode.
  • Clock management,2nd PLL digital plastic,DOP demodulation,PCM/DSD depop exclusive technology such as the switch.
  • The whole interface support DSD DOP decoding,PCM384K DSD256.


  NOTE: Black only has no USB version.Thank you!



DAC-X20 pro core chip uses two ES9028PRO,left and right channels for each one.

First use of adaptive technology and asynchronous master clock master clock technology.

Two clock mode can be freely selected.
Full interface supports DSD decoding. USB support DSD hardware solution,Coaxial Optical

AES / EBU support DOP decoding, which can be accessed several

Broadcast SACD listening to music.

Full interface supports 24Bit 192khz (USB 32B 384K).
Using CPLD programmable logic device. MESNAC ES9018.
3-speed gain,volume can be adjusted,a total of 100 stalls adjustable

Volume attenuation from 0 to -99DB.
USB sub card using XMOS program, PCM up to 32B 384khz, DSD up to DSD128.
Six kinds of input methods:IIS fiber`BNC coaxial port`

AES/EBU`USB,through the key switch.
Adopt TFT LCD display,adjustable contrast
Power supply with two O-type transformers,digital and analog independent power supply,

And the use of discrete components regulation.
Fully balanced analog line discrete components.Unbalanced RCA output simultaneously.

Gustard X20 Pro

IR Remote Control
Driver/software CD(Windows,Mac OS,iOS,Android 4.0 or higher)
Power Cable
Original Packaging


Adopt more humane modular XMOS USB daughter card.

Analog circuit use High-end discrete lines.
Doul ESS Technology Sabre Reference 32bit ES9028PRO DAC chip,R and L sound Chanel one on each side.
SNR up to 129db,distortion rate -120db
Automatic adaptation master clock technology and Asynchronous master clock technology
Two clock mode can be freely selected.
XMOS 32bit USB receiver chip which is best performance asynchronous USB audio solution. 
CPLD programmable logic device.Soft control.
Three files gain,volume can be adjusted.Attenuation adjustable from 0 to -99DB.
TFT LCD screen,adjustable contrast.
Power supply with two 50W O-type transformers,Digital and Analog independent power supply,and use Discrete Components regulation Voltage stabilization.
Full balance Discrete components Analog Line.Balance / RCA output simultaneously.
Digital Input:balanced Spdif AES/EBU port,RCA,Toslink Optical input and USB,(Key switch)
Both 110/120v and 220/240v version supported.
Power Supply:AC 230V 50 / 60Hz (AC 115V 50 / 60Hz),Power Consumption: <50W
Dimensions (excluding protruding part): W 380MM * H 65MM * D 260MM
Package Size:L 470MM*W 360*H 175MM
Extensive digital filtering


ESS Technology ESS ES9028PRO Sabre Reference 32-bit DAC

8 mono to 2 stereo configuration,4 D/A converters per channel

Digital Input:


PCM:16-24bit /44.1、48、88.2、96、176.4、192 kHz




PCM:16-24bit /44.1、48、88.2、96、176.4、192 kHz



PCM:16-24bit /44.1、48、88.2、96、176.4、192 kHz




PCM:16-32bit /44.1、48、88.2、96、176.4、192、352.8、384kHz

DSD Native:DSD64、DSD128、DSD256、DSD512



USB:16-32bit / 44.1、48、88.2、96、176.4、192、352.8、384 kHz


Analog Output: 

RCA Output:3.0 Vrms @0dBFS
XLR Output:6.0 Vrms @0dBFS 
Frequency:20-20K Hz +/-0.15dB

Mac OS X 10.6.4 and above don't need to install the driver

USB 2.0 interface can replay 1BIT/2.8224MHz or asynchronous sampling rate 5.6448MHz DSD Digital Signals.
This is supported DSD64/DSD128/DSD256.
Coaxial / Optic / AES / EBU support DOP64,can connect Digital Music Player playback SACD MUSIC

2*ES9028PRO,L and R channel are use one,sound stable,rich in detail,dynamic flexible,each other don't interfere.

Automatic adaptation master clock technology and Asynchronous master clock technology.
Two clock mode can be freely selected.
CPLD Digital Integer technology

Independent analog PCB,digital and analog separate design.

Analog LPF circuit using Fully discrete circuit  Class-A line.
Fully discrete circuit  Class-A work flexibility. It is free to adjust the parameters of each level.
Technical experience and long debugging process, to achieve the best working condition.

Two 50W O-type transformers. The best choice for high-end equipment.
Coupled better and more efficient. A more stable job, to bring you more beautiful sound.

ACCUSILICON femtosecond crystal:

Multi-level regulator+multi-stage filter power scheme:

XOMS U8 USB Professional SOUND CARD:
XMOS USB using the latest and highest-level U8 (8 core) USB AUDIO scheme,PCM highest support 32Bit 384K,
DSD Support DSD64 (2.8224MHz), DSD128 (5.6448MHz),DSD256,with leading system compatibility:
Compatible includes 32/64-bit Microsoft Windows XP,WindowsVista,Windows7,Windows8,Windows 8.1,Windows 10 and other mainstream Windows systems,supports Apple MacOS systems,Linux kernel support system,and is compatible with partial support OTG function of iOS,Android smart devices.

Frequency response:



Customer Questions & Answers


Will the X-20 Pro be able to be synchronized with 2 other X-20 Pros to create a multichannel DAC?  thanks,  jjk

11/15/16 9:16 PM Asked.

Hi Steve,it can't do it.Thank you.

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Hi - Would you say that this is a better Dac than the A20H? Help me understand what you mean that the X20 Pro has 4 D/A per channel - I thought it has just two ES9028 chips? Does each channel has it's own independent power supply? Do the chips operate in mono or stereo?

11/21/16 9:01 PM Asked.

Hi Garth,x20 pro just DAC,A20H is head amp+DAC.X20 PRO DAC better than A20H DAC.X20 PRO have 4 channel, 2 slices ES9028PRO, not independent power supply,it's stereo.ES9028PRO have 8 channels.Thank you.

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hi  what is the difference between pro and no pro ( what the chips change)  thx

11/22/16 7:16 PM Asked.

Hi thomas,    The x20 had stop product,the chip is ES9018.  The X20 pro is the newest version,with new chip:ES9028.    Best Regards  Kerwin  Shenzhenaudio

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Does the new "X-20 Pro" come with the new XMOS XU-208 usb decoding chip or with old XMOS-U8 usb decoding chip (like the "X-20" did if my memory is correct)?

11/23/16 11:51 AM Asked.

Hi Jared,new "X-20 Pro" come with the XMOS-U8 usb decoding chip.Thank you.    

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Can you tell me what opamp the X20 Pro uses? Can I go straight from the X20 Pro into my amplifier controlling volume from the dac?    

11/23/16 9:40 PM Asked.

Hi Garth,X20 PRO is division line,it does not need to be operational,you can go straight from the X20 Pro into my amplifier controlling volume from the dac.Thank you.

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Hi  I plan on connecting the Gustard X20u to my Music Server To do that it must conform to Linux USB Audio 2.0 standards. Can you confirm that please  Best Regards  Trevor

11/27/16 9:07 PM Asked.

Hi Trevor,yes,Gustard X20u pro support conform to Linux USB Audio 2.0 standards.Thank you.:)

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Do it play over 20khz or its frequency responce is limited by 20khz ?

11/28/16 3:28 PM Asked.

Hi George,    According to the sampling theorem,the upper limit of frequency is half of the current input digital signal sampling rate,when working in PCM mode.    Thank you.

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Hello,  I would like to reclock the 9028Pro with my PinkFaun I2S Bridge card. How do I do it? thanks

11/29/16 9:59 AM Asked.

Hi jjk,it can't do it.Thank you.

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Can I get a 100 vac 50/60 model as I live here in Japan?

11/30/16 6:38 PM Asked.

Hi JimO,Of have 110V and 220V version.Thank you.

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I would like to know if I can use the HDMI output of my notebook to input i2s dac. thank you

12/2/16 1:23 PM Asked.

Hi salvatore,it can't.Thank you.

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