GUSTARD A20H Dual AK4497 XMOS USB PCM/DSD DOP DAC Decoder and Class A Full Balanced Amplifier

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Price: $836.00
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1.  Dual AK4497 class A full balance amp,native full balance.
2.  Decoder and amplifier all-in-one ,well proportioned,double power supply design.
3. Clock management ,2nd PLL digital plastic,DOP demodulation/modem,PCM/DSD depop switch and other exclusive technology.
4. All interfaces support DSD decoding,digital broadcasting,USB supports 384K DSD256.

Technical features:
1. The latest hi-end AKM AK4497EQ decoding chips, make no interference in L/R channels and purer sound
2.  Clock management ,2 nd PLL digital plastic,DOP demodulation/modem,PCM/DSD depop switch and other exclusive technology.
3.  Using full discrete component large current hi-end full-balanced amplifier,each channel uses two separated amplifier unit to form asymmetric output circuits.
4.  Native full balance architecture, there is no any transition from DA to amp circuits,it is a complete four-way output volume.
5.  Using two customized 50w audio specialized ring transformers to supply power separately to the amp and decoder,so that their power supply has no interference to each other.
6.  Using own-created individual analog LPF cirtuits,the parameters of each level has been carefully adjusted to achieve the best conditions.
7.  The all interfaces support DSD decoding :IIS supports DSD64,DSD128,DSD256 decoding; SPDIF,Optical,AES/EBU support DSD64 decoding(DOP mode); USB supports SD64,DSD128,DSD256 decoding.
8.  Rich digital filtering,two kinds of DSD: Wide BW/Narrow BW;six kinds of PCM: Short Delay Shar p / Short Delay Slow / Shar p / Slow / Low-dispersion Short Delay Filter/ Super Slow.
9.  Adjustable screen brightness:it will return to the default brightness after 30s’no-operation;it will automatically remember the current brightness,and the next time you start up, it will keep the last setting.
10.  The USB uses the USBAUDIO specialized U8 chip from XMOS,it can support PCM384, DSD256.
11.  Full aluminum alloy box,two colors(silver and black) are available.

Size:330*260*65 mm(w*d*h)
Size with package:420*360*175 mm(w*d*h)
Weight with package:6.5kg
Frequency response:20Hz-20kHz+/-0.1dB
Output circuit(turning off the pre-amp):RCA output level: 2.0Vrms@0dBFS, XLR output level : 4.0 Vrms @0dBFS
XLR interface:American standard (1 ground wire,2 positive line,3 negative line)
Earphone max output power: 2400mW@32Ω

Load power:
32Ω         2400mW
64Ω         1230mW
150Ω         530mW
300Ω         264mW
600Ω         132mW

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 iOS, Android smart devices .

American  ACCUSILICON femtosecond crystal;

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

I2S Pin definition


Shipping Fees

Worldwide Free Shipping on SHENZHENAUDIO, Please allow 1-3 business days for conduct Quality Control in order to ensure the products quality.

If a customer would like the order reshipped, they’ll be charged a reshipment fee. Customers may also be subject to a restocking fee of up to 20 percent of the product cost.

Which Couriers To Use?

Given the amount of shipping partners we work with and the vast coverage area we serve, there are likely regions with much longer transit times than others. If you have any feedback, suggestions, or problems with the courier of your shipment, please feel free to submit a support ticket via the "Contact Us" button below.

Our goal is to provide our customers with the best shipping experience possible at a reasonable cost. This is why we constantly negotiate with existing shipping partners for lower rates and actively test new couriers for potential opportunities.

PO boxes or APO/FPO

The ability to ship to PO boxes or an APO/FPO address depends on the item's weight. If an item weighs more than 9 pounds, we won’t be able to ship to these addresses because of our current courier agreements.

To determine if your order is eligible for shipment to PO boxes or an APO/FPO address, please contact SHENZHENAUDIO Support.

Estimated Delivery Time

For customers in the continental United States:
5 to 14 business days from the date of shipping

For customers in Hawaii and Puerto Rico:
2 to 4 weeks from the date of shipping
International customers can expect longer shipping times, depending on the country in which they live:

Canada: 1 to 3 weeks from the date of shipping
Australia, New Zealand, Germany, France, and the UK: 2 to 4 weeks from the date of shipping
Other countries not listed above: 3 to 6 weeks from the date of shipping

Please keep in mind that these are rough estimates and shipments can be delayed due to unforeseen circumstances, like postal strikes or severe weather.

If, for some reason, you don’t receive your order within the estimated time frame provided above and suspect that it might be lost in transit, please submit a support ticket from your transactions page and we can look into the order with the courier. Lost-in-transit requests must be submitted to SHENZHENAUDIO Support within 4 months of the date of shipping or before the courier archives the tracking information.

Easy 30-Day Return Policy

If you are dissatisfied with your purchase for any reason, you may return it to SHENZHENAUDIO within 30 days of the received date, subject to the conditions and exclusions below.

Eligibility Conditions

Please read conditions below. If all conditions are not met, SHENZHENAUDIO reserves the right to refuse the return. All returned items must be in new condition, in their original unaltered box (including an intact UPC code) and must include all packing material, blank warranty cards, manuals and accessories. SHENZHENAUDIO can only refund the original purchase price. Shipping and handling fees are nonrefundable.

Defective or Damaged Items

Defective items may be repaired, exchanged or refunded at our discretion for the same model or manufacturer's equivalent model.


Depending on where you live, the time it may take for your exchanged product to reach you, may vary. Please allow 3-5 business days for mail-in exchanges to be processed.

Refunds & Credits

Once we receive and inspect your item(s), we will credit your account. Please allow 5-7 days for a credit to appear on your account. In most cases, we will issue your refund in the same way you made the original purchase. Please note: we can only refund the original purchase price. Shipping and handling fees are nonrefundable.

You will be responsible for paying for your own shipping costs for returning your item. Shipping costs are non-refundable. If you receive a refund, the cost of return shipping will be deducted from your refund.


To return your product, you should mail your product to: 4F 405, Building F, No.2 Shangxue Science and Technology North, Bantian Street, Longgang Dist, ShenZhen, 518129 Guangdong, China

If you’ve done all of this and you still have not received your refund yet, please contact us at