Gustard A22 technical features:

• The left and right channels are each using a AKM company's flagship chip AK4499 for dual mono audio digital-to-analog conversion. The two-channel DAC circuits are completely independent and independently grounded, and do not interfere with each other to achieve optimal performance.
• Using CPLD programmable logic chip, self-developed logic function digital integrated circuit, built-in clock management, 2nd PLL digital shaping, DOP demodulation, PCM/DSD depop switch and other exclusive technologies, laying a solid foundation for excellent sound quality;
• 8-channel hybrid discrete IV conversion circuit and independent adder circuit, fully meet the requirements of AK4499 output current, and ensure high sound quality from the source;
• The digital and analog circuits each use a specially customized 50W audio dedicated toroidal transformer, which is completely independent and does not interfere with each other;
• Native fully balanced architecture, without any conversion, complete two-channel fully balanced output;
• The analog LPF circuit uses the discrete line independently developed by Gustard, and has carefully adjusted each level of parameters to achieve the best working condition;
• Supports high-quality digital volume adjustment of 0dB~-90dB total 90 positions, with remote control for easy adjustment of volume;
• All input interfaces support DSD:
IIS supports DSD64, DSD128, DSD256, DSD512;
SPDIF, AES/EBU support DSD64, DSD128 (in DOP mode);
Optical supports DSD64 (in DOP mode);
USB supports DSD64, DSD128, DSD256, DSD512;
• A wide range of digital filter options
The PCM has six digital filters available: Short Delay Sharp Roll-off/Short Delay Slow Roll-off/Sharp Roll-off/Slow Roll-off/Super Slow Roll-off/Low Dispersion Short Delay Filter,
DSD has 2 digital filters available: L-BW and H-BW
• The A22's built-in USB digital audio interface daughter board uses an XMOS USB audio controller XU208, which supports up to PCM768 DSD512.
• The brightness of the screen is adjustable, it will be automatically remembered after 10 seconds of operation, and the previous settings will be automatically maintained at the time of power-on;
• Dimensions: width 330* deep 260* height 65MM (without protruding parts);
• Package size: length 420* width 360* height 175MM;
• Packing weight: 7.5KG;
• International voltage AC100V-240V (requires manual adjustment);
• Frequency response: 20Hz-20kHz +/-0.08dB

• Line output level:
RCA output level 3.0 Vrms @0dBFS,
XLR output level 6.0 Vrms @0dBFS

• XLR pin definition: US standard (1 ground, 2 hot, 3 cold) 

The full interface supports DSD decoding.

IIS, USB support: DSD64, DSD128, DSD256, DSD512 hard solution;

Coaxial (RCA), AES/EBU support: DSD64, DSD128 hard solution (DOP mode);

Optical support: DSD64 hard solution (DOP mode);

Digital input:

• IIS, USB support PCM format: 16-32bit/44.1, 48, 88.2, 96, 176.4, 192, 352.8, 384, 768kHz; DSD64, DSD128, DSD256, DSD512;

Coaxial supports PCM format: 16-24bit / 44.1, 48, 88.2, 96, 176.4, 192, 384 kHz; DOP64, DOP128

Optical, AES/EBU support PCM format: 16-24bit / 44.1, 48, 88.2, 96, 176.4, 192 kHz; DOP64

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