GUSTARD A20H / XMOS PCM/DSD USB DAC Double AK4497 Headphone Amplifier

Geshide /GUSTARD – A20H  XMOS USB PCM/DSD DOP DAC Decoding Machine Double AK4497 Headphone Amplifier

Highlight

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,DSD512 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.

Parameters:

Size:330*260*65 mm(w*d*h)

Size with package:420*360*175 mm(w*d*h)

Weight with package:6.5kg

Voltage:AC100v-240v

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;

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, DSD512;

USB support DSD64, DSD128, DSD256;

Coaxial / fiber / AES / EBU support DSD64 (DOP mode);

Frequency response

THD+N

SNR

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

I2S Pin definition