Post by NPAudio on Mar 27, 2021 10:55:23 GMT
As a company that has only focused on HIFI webcast audio for the past ten years, Xiangsheng has core patents and underlying audio standard implementation and optimization technology blessings, and has a deep understanding of the entire digital audio playback and industry. Digital audio playback has shifted from traditional pure offline high-definition music playback to online high-definition playback. The most important reason is the application of music copyright.
However, as a company with HIFI audio research and development as its core, Xiangsheng did not give up. After the research and development of D300REF, it was transferred to the X86 platform in 2017 and engaged in the research and development of X86 motherboards. After hard work, it became an Intel motherboard cooperative development company. At the same time, it cooperates with third-party BIOS brands to customize Xiangsheng HIFI-level BIOS firmware. From the successful independent research and development of the first version of the X86CPU board to the development of four versions of the HIFI-level X86 motherboard in the last three years, the hardships in the middle are unimaginable for a niche HIFI company. Because of the four major versions of the ARM+FPGA patent architecture, the optimization of the ARMCPU board, the optimization of the CPU noise and delay of the new portable platform, and the research and development of all ALLIn, the fourth edition met the requirements. The USB output quality has reached the same level as Xiangsheng’s latest CD-ONE. It has reached the USB output with ultra-low noise, ultra-low latency, clean and transparent sound, and full of emotion. Experimenting on the A300, the A300USB+ custom driver output sound has significantly exceeded the A300SD /USB hard disk playback, many USB decoders have also gained a new life, and the response of the network interface has also been significantly improved, which is not comparable to the existing general NAS.
The research and development of All In has also led to the core reason why Xiangsheng has fewer new products in the past three years.
Windows startup interface
After three years of research and development and in-depth optimization of AllIn, we are well aware of the vicious circle of low sales and huge investment in niche industries. It took three years to build a CPU motherboard and almost invested all the research and development resources of Xiangsheng. Coupled with the 5-year update cycle of the CPU motherboard, as the function and performance requirements of the APP increase, the operating pressure is increasing. Although the windows platform is updated slowly now, the three-year cycle of research and development has led to a platform that can only meet the needs of audio, with average performance, and a vicious circle in the long run. Therefore, Xiangsheng's independent AMC platform, although the desktop function is still powerful, is more used for low power consumption and mobile platforms. The following is the information of AMC Xiangsheng self-research platform:
After our analysis, the most basic transformation for consumer motherboards to meet the requirements of AMCHI-FI is the power supply system. To make external USB, HDMI and other audio-related core interfaces from 5V power supply to IO 3.3V power supply all must use low-noise linearity To optimize the power supply, it also requires a motherboard design with ultra-low EMI and a design with as much power margin as possible. Thinking about it this way, the motherboards on the market now can only be as close as possible to pure ATX-powered motherboards, and integrated GPUs, without any external plug-in graphics cards, PCIE and other behaviors that increase EMI, and CPU power consumption is as much as possible The motherboard is low and can make full use of the advantages of ATX power supply. However, some low-power 12V/24V single power supply motherboards, 5V and 3.3V power supplies are all switching power supplies DC-DC switch mode step-down, noise is very large, even linear power supply is meaningless, so NUC, etc. are directly excluded Single power supply motherboard. As a result, a comprehensive screening of the three major brands of motherboards around the world was carried out.
However, research on thousands of in-production motherboards of the three major brands found that after the introduction of the ATX-12V standard many years ago, most motherboards almost did not fully use the 5V and 3.3V in the ATX standard for IO power supply, which led to the most basic The IO linearization can not be achieved. But in the end, we found that it was possible to use the original power supply of the ATX power supply in less than 10 motherboards of ASROCK, and finally confirmed that the two motherboards met the requirements of IO linearization. However, IO linearization is only the basis. Measured by self-developed standards, there is still a certain gap from AMC. Even if the ATX power supply uses the extremely luxurious Hi-END power supply, the motherboard part is designed with a relatively low cost, and it is still the noise of the USB output. And the chip power response has obvious effects. For example, the power supply of the phase-locked loop is based on a 3.3V step-down, the related filtering is relatively general, some useless chips need to be disabled, the board-level power supply needs to be strengthened, etc., these are not finished products Of consumer motherboards. For this reason, Xiangsheng actively communicated with its partner of intel motherboard and the help of its own OEM customers, and finally it was difficult to reach an agreement with ASROCK: based on all the information of Intel chips, the amount of HIFI is small, so the motherboard optimization After the completion of Xiangsheng, ASROCK provides support. ASROCK completely re-developed the BIOS according to the requirements of Xiangsheng, reaching the standard of audiovisual HIFI.
The large current output is 5V, and each 12V independently can reach up to 14A rated current.
DC output internal resistance <3 milliohms, noise 1~3mv
The second-level ultra-high-performance high-frequency low-impedance capacitor capacity> 20000uf.
Innovative circuit and design 12V power supply efficiency can reach 80% normally.
Therefore, AMC has two platforms, one for mobile and desktop products, and one for pure home consoles:
The hardware platform is the two cores of AMC, in fact, system optimization is also a crucial part. However, Windows systems for professional audio use, home versions and personal versions are difficult to meet the demand. One reason is that the system is compatible with too many useless components and functions for comprehensive purposes. The second reason is that Microsoft uses the personal Windows system to promote its own products, so there are too many interferences and effects that affect the audio and video that cannot be uninstalled. Therefore, Xiangsheng’s customized system, based on the latest LTSC version of Windows enterprise level, deletes useless components again. No ads, no app store, no Xiaona, no pulse, no native built-in Office and other components that are not related to audio and video, so it’s not easy to upgrade. (Only upgrade safety-related), a particularly lightweight genuine operating system. At the same time, Xiangsheng has once again customized the components that are not related to audio and video, and optimizes the depth configuration for audio and video, so as to achieve a safe and efficient genuine enterprise multi-language customization system for audio and video.
As the top three industrial design company in Asia for Red Dot Concept Design, Shenzhen Zhixing Design relies on years of design experience to design and optimize the appearance of MR2 for a year, which fully reflects the beauty of the integration of music, life and professionalism. On the basis of using the AMC mobile platform, Xiangsheng relies on previous FPGA optimization experience, as well as the direct support of the original XMOS R&D engineer, integrates its own experience and algorithm core into the XMOS implementation, supports DSD512 and PCM768khz, which is more excellent The IIS output quality. At the same time, the industry’s unique military-quality reference clock products are customized, and the ultra-low phase noise in the top audio area is still achieved in the case of +-1ppm in the temperature range of 90 degrees. However, most of the audio custom clocks 45.1584MHZ and 49.152MHZ drift up to +-20ppm under a wide temperature range, and the phase noise is only equivalent to the Xiangsheng reference clock, including the industry’s single ultra-low noise clock of hundreds of yuan, such as crystek. ,accusilicon.
The impact of USB driver on sound is also very important. MR2 custom-made professional audio manufacturers customize ultra-low latency, high-priority pure stereo playback ASIO audio special paid driver, which is significantly lower than XMOS and other free delays, and the sound Transparency, details are obviously enhanced, and it is completely born for the ultimate music.
MR2 USB has high-quality USB output and deeply optimized 1000M network throughput, Windows+RoonCore-level processing power, but because of the integrated analog board, it is regrettable that SATASSD hard disk cannot be built-in, so the MR2 pure USB network turntable version is introduced. Its appearance is almost the same as MR2, add built-in SSD hard disk (optional), you can add 1000M network interface as much as possible. Remove the MR2USB part and the analog DA amp board, because it has more space and allows the CPU to be turbocharged for a long time, so that the heat dissipation is better, the performance is stronger, and the cost is lower, so the MR2 pure USB network turntable version will be in early 2021 Launched, the price is only 9999RMB, MR2 19999RMB.
Based on AMC architecture ASROCK cooperation customized optimization platform
Customized top-level ultra-low internal resistance top-level A-core high-power transformer (primary is only 4 ohms)
The main board PCB is fully shielded and installed.
All-aluminum CNC is common without screw design.
Enjoy sound USB/network digital tuning technology.
Independent external 3.5-inch 2.5-inch unlimited capacity pure sex line luxury power supply hard drive access.
Two versions to meet different needs.
D1 is divided into two versions. In addition to the general functions mentioned above, the D1 premium version is configured as follows:
The enterprise-level 256G SSD disk is the system disk
190W Hi-END pure line power supply system.
In order to strengthen the in-depth cooperation with Intel and motherboard manufacturers to achieve higher sales, the MR2 USB turntable version and the D1 premium version are set as the company's strategic products, similar to A1, pursuing greater sales and extremely low profit margins. The MR2 USB turntable version starts from 9999, while the D1 premium version is only 14999.
D1 Deluxe Edition (two colors of silver and black), premium version of wireless Blu-ray optical drive module
D1 black premium version and deluxe version rear
The built-in high-performance full-linear Blu-ray drive can play various types of discs such as CD/DVD-Audio/Blu-ray, and supports track grab storage.
Add high-power and high-performance power filter module designed by Xiangsheng.
AMC 250W ultra-high-power Hi-END linear power system
The system disk is upgraded to an enterprise-level 512G SSD.
Through the introduction of AMCD1, it is not difficult to know that AMC can not only meet almost all the needs of audio. For this reason, the function of D1 is far more than that. The following functions are gifted, but its performance is far from ordinary products. For example, the HDMI output function of AMCD1 does not optimize the phase-locked loop clock, but optimizes the phase-locked loop power supply, IO power supply and the power supply system of the entire motherboard, and adopts the Hi-END-level high-power linear power supply standard, which makes the picture quality obvious Clear and better colors.
Video: HDMI2.0 Output: 4K@60kz UHD, DP1.2
192khz 7.1 channel ASIO optical fiber output, separated from 1 HDMI audio and video.
At the end of the conference, Xiangsheng updated a product that users have been mentioning: A300REF. Xiangsheng also responded. The A300REF delay is because of a reference decoder developed by Xiangsheng, which is a very ideal solution except for only supporting 384khz and DSD256. The PCB has been completed. The current stage is the software debugging stage. The original decoding of A300REF is the decoding part of MR2, so if this decoding exceeds the MR2 decoding part, A300REF will use the MR2 decoding part. The following are the characteristics of this reference decoder:
Lossless upscaling + NOS, lossless upscaling + Pure DSD, original mode.
HDMI IIS and USB are the best sound quality interfaces.
The unique clock system of military industry level.
At the same time, Xiangsheng brought the latest customized reference fuse 0.5A, 20mm samples. The fuses of all existing Xiangsheng products are qualitatively improved, the sound is warm and durable, and the reference level is restored. No matter A1, P1, A300, or D300REF, there is an immediate effect, which is suitable for all existing products of Xiangsheng . At the same time, there will be a high-power series of about 5A in the custom test, and the products for the AMC machine are priced at 300 yuan. 0.5A is currently in production, and group buying activities will be opened upon arrival, so stay tuned.
