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GUSTARD A20H HIFI DAC/Headphone Amplifier/Double AK4497EQ/XMOS DSD256 384Khz




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Product Details

Driver and User Guide: https://download.shenzhenaudio.com/Gustard/Gustard%20A20H/A20H-ALL.zip

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


• The latest top-level decoding chip AKM AK4497EQ x2,left/right channel independent, isolated interference,the sound is more pure;
• CPLD programmable logic chip,the logic of its own construction of digital integrated circuits,clock management,2nd PLL digital shaping,DOP demodulation,PCM/DSD depop switch exclusive technology.For excellent sound quality and laid a solid foundation;
• Full Discrete Component High Current Pure Class A balanced headphone amplifier,each channel uses two independent amplification units to form a symmetrical output line,single-ended and balanced output at the same time,providing an excellent listening platform for the majority of headphone lovers;
• Native fully balanced architecture,from DA to the amplifier circuit,without any conversion,the full four-way output volume;
• DAC and headphone amplifiers each use a custom 50W audio dedicated toroidal transformer,fully independent power supply.
• Analog LPF circuit using independent development of discrete lines,carefully adjust the parameters of each level,until the best working condition;
• High/low selectable gain in preamp mode.Supports 60 analog lossless volume adjustment.Remote control with the post-amplifier,active speaker;can also turn off the pre-function,DA line straight out.RCA single-ended and XLR balanced output at the same time;
• A20H use Native full-balanced design,from decoding to volume control,including the amp section are fully balanced design.
• Full interface support DSD hardware decode:IIS supports DSD64,DSD128,DSD256,DSD512;

SPDIF,Optical,AES/EBU support DSD64(DOP mode);

USB support DSD64,DSD128,DSD256;
• Digital filtering,DSD provides Wide BW/Narrow BW;PCM provides Short Delay Shar /Short Delay Slow/Sharp/Slow/Low-
• XOMS U8,Support PCM384/DSD256;
• Adjustable screen brightness.If no operation after 30 seconds to restore the default brightness;
• All-aluminum chassis.
• DAC Size: 330(L)* 260(W)* (H) 65MM (without protruding parts);
• Package size: 420 (L) * 360 (W) * 175MM (H);
• With packaging weight: 6.5KG;
• International voltage AC100V-240V;
• Frequency response: 20Hz-20kHz +/- 0.1dB
• Line Output (off-stage): RCA Output Level: 2.0Vrms @ 0dBFS, XLR Output Level: 4.0 Vrms @ 0dBFS
• XLR interface definition: US standard
• Headphone AMP maximum output power:2400mW @ 32Ω
Load power:

32Ω  2400mW

64Ω  1230mW

150Ω  530 mW

300Ω 264 mW

600Ω 132 mW

Rigorous design,rational layout,clean workmanship,excellent materials

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.

AK4118 receive demodulation - sent to the CPLD for processing;
CPLD programmable logic chip, self-built logic functions of digital integrated circuits, clock management, 2nd PLL digital shaping, DOP demodulation, PCM / DSD depop switch and other exclusive technology;

Fully discrete circuit High Current Pure Class-A Balanced Headphone Amplifier.
Professional team design.
The input stage adopts audio special low-noise tube, full-DC amplification, carefully debug each level work in the best working condition.
The final stage use 4xMedium power tube, Big Output Power, most of the headset to play the best results;

2X50W custom toroidal transformer.Completely independent power supply, do not interfere with each other.For high-quality sound to provide better power supply environment and power;

Multistage filtering and voltage regulation.,To ensure clean and stable power supply;

Relay array,60 files simulation of lossless volume adjustment;

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), 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 MacOSsystems, Linux kernel support system, and is compatible with partial support OTGfunction of iOSAndroid smart devices .
USA ACCUSILICON femtosecond crystal;

Full interface supports DSD.
IIS supports DSD64, DSD128, DSD256, DSD512;
USB support DSD64, DSD128, DSD256;
Coaxial / fiber / AES / EBU support DSD64 (DOP mode);
Frequency response



Headphone amplifier 2-channel each connected 32Ω load,Output power at 2400mW: distortion and waveform.

I2S Pin definition

Questions & Answers

  • Q: is the volume knob of the black model in the newest revision black or silver?
  • A: Dear Oliver,This is silver volume knob.Thank you.
  • Oliver 2/8/18 3:45 AM Asked.
  • Q: HI! Which switching state is the default setting in the phase invert option
  • A: Dear,Please choose dis option.Thank you.
  • Soli 1/19/18 2:14 AM Asked.
  • Q: Hi, the product description gives the following values : 32Ω 2400mW 64Ω 1230mW 150Ω 530 mW 300Ω 264 mW 600Ω 132 mW Are these values for the balanced XLR headphone output or the unbalanced 6,5mm single ended headphone output? I would like to know the values above (output power at different impedance levels) for both the balanced and unbalanced headphone output, as they usually are different, please. Thank you.
  • A: Dear, balanced headphone output: 32Ω 2400mW 64Ω 1230mW 150Ω 530 mW 300Ω 264 mW 600Ω 132 mW unbalanced headphone output: 8Ω 600mW 16Ω 307.5mW 37.5Ω 132.5 mW 75Ω 66 mW 150Ω 33 mW
  • Joe 1/18/18 3:08 AM Asked.
  • Q: Hi, could you provide the Max Ouput Power for both unbalanced SE and balanced XLR headphones outputs, please?
  • A: Dear Joe,Headphone AMP maximum output power:2400mW @ 32Ω.Thank you.
  • Joe 1/17/18 5:08 AM Asked.
  • Q: Hi, Does the output connect directly to active studio monitors or will it require an audio interface?
  • A: Dear Arun,yes,please open pre mode.Thank you.
  • Arun Gopal 12/21/17 1:56 AM Asked.