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GUSTARD A22 DAC Dual AK4499 XMOS Balanced DAC

The MQA version is available later.

We have systematically studied the chips of AKM (Asahi Kasei). Now, based on the careful debugging of their previous generation flagship chip AK4497, we released Gustard’s first audio DAC product with dual AK4499. That is, A22.

The analog LPF circuit of the A22 still uses the full discrete Class A circuit that we have applied for many years. This discrete circuit has been very matured after many years of practical application.

This time we also made targeted adjustments to other peripheral circuits of the AK4499 chip to improve the overall quality of the A22. A22 is very good in both user function and performance.

The Gustard A22 is an audio DAC that uses two AK4499EQs for dual mono audio digital-to-analog conversion.

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;

The newly designed 8-channel hybrid discrete IV conversion circuit and independent adder circuit fully meet the requirements of the AK4499’s large output current, ensuring high sound quality from the source;

Multiple sets of independent power supply circuits ensure sufficient energy and no interference with each other;

The analog LPF circuit of the A22 is a fully discrete Class A circuit that is specially designed and tuned for the AK4499 chip.

CPLD programmable logic chip, digital integrated circuit with its own logic function, clock management, 2nd PLL digital shaping, DOP demodulation, PCM/DSD depop switch and other exclusive technologies, laid a solid foundation for excellent sound quality.

Each discrete device only needs to consider its own performance separately, so there are fewer application limitations than using integrated op amp chips, so that the performance of individual components can be fully utilized.

Unlike transistors inside an integrated circuit that are integrated into the die and cannot be adjusted and changed, the use of discrete devices is more flexible. We can freely adjust the parameters of each stage to achieve optimal operation. Also because of its It is more developable and relatively controllable for parts that produce distortion, giving a different variability in sound style for different audio DAC circuits.

The disadvantage of discrete devices is that their distribution parameters have a great influence, and it is difficult to design and debug. It requires certain technical experience and a long debugging process. Moreover, the consistency of the discrete circuits is relatively weak, so the materials need to be more reliable.

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.

A22’s power supply circuit uses multiple independent voltage regulators and multi-stage filtering to achieve independent power supply to the left and right channels and avoid mutual interference;

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;

The A22’s built-in USB digital audio interface daughter board uses an XMOS USB audio controller XU208, which supports up to PCM768 DSD512.( No USB input version without this module);

A22 USB digital audio daughter board built-in audio clock source using ACCUSILICON femtosecond crystal oscillator AS318-B;

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

IIS:

 

 

 

Features:

>High-Performance Dual AK4499 Flagship DAC Chipset.

>Full-Balanced Native Architecture.

>HiFi XMOS XU208 USB Signal Receiver Chip.

>CPLD Programmable Logic Chip.

>8-Channel Hybrid Discrete I/V Conversion Circuit.

>Support Hi-res signal decoding with up to 32-Bit/768kHz and DSD512 natively.

>Dedicated Independent Powersupply.

>Multiple PCM & DSD Digital Filters.

>DSD Support Across Full Interface.

>Frequency Response: 20Hz-20kHz.

>Line Out Level(RCA): 3.0Vrms@0dBFS.

>Line Out Level(XLR): 6.0Vrms@0dBFS.

>Fully Discrete Class A LPF Circuit.

>XLR Pin Configuration: US Standard(1 ground, 2 hot, 3 cold).

>Dimensions: 330mm*260mm*65mm.

>Packing Size: 420mm*360**175mm.

>Packing Weight: 7.5Kg.

Gustard has released its latest flagship desktop DAC system, the Gustard A22. It serves as your premium DAC with its HiFi AK4499*2 Dual DAC chipset providing industry-leading ultra-low distortion and high SNR ratings.

Flagship Performance, Flagship Chips:

Gustard has chosen the premium AK4499 to be the decoding heart of the flagship A22. They have equipped two AK4499 DAC chips, one for each channel for a completely balanced architecture. Users are greeted with ultimate clean output with super-low distortion and high SNR ratings. It also features an 8-channel hybrid discrete I/V conversion circuit, fully meeting the requirements of AK4499 output current, and ensuring high sound quality output.

Advanced CPLD Programmable Logic Chip:

Gustard has equipped the A22 with a custom-developed CPLD Programmable logic chip. It provides various digital integrated circuit managing functions such as, providing built-in clock management, 2nd PLL digital shaping, DOP demodulation, PCM/DSD depop switch, and other exclusive technologies, laying a solid foundation for HiFi sound performance.

High-Resolution Signal Decoding:

The Gustard A22 support high-resolution signal decoding with up to 32-Bit/768kHz PCM Decoding and up to DSD512 native DSD decoding support. It supports DSD decoding across all the supported interfaces. With USB/IIS it supports full DSD512 support, with SPDIF/AES/EBU it supports up to DSD128, and Optical input supports up to DSD64.

High-Performance LPF Circuit:

The Gustard A22 supports the same trusted fully discrete Class-A LPF circuit that Gustard has utilized in its previous high-tier devices. It uses the discrete line independently developed by Gustard and has carefully adjusted each level of parameters to achieve the best working condition.

Independent Power Supplies For Both Channels:

Gustard A22’s power supply circuit utilizes multiple independent voltage regulators and multi-stage filtering to achieve an independent power supply to both channels. This helps in avoiding any issues of electrical noise interference and providing a clean output for its users.

Accurate Volume Adjustment With Remote Control:

The Gustard A22 supports 0dB-90dB volume adjustment with precise 90-level adjustments. It comes with remote control for easy control and adjustments.