Many friends need optical input function and a higher specification USB DAC for wired connection to a computer or mobile phone. So Zishan upgraded the MD2 model on the basis of MD1. Suggestion: If you only use U disk or Bluetooth to buy MD1. If you want optical input function or high-spec USB DAC, buy MD2.Looking back, it turns out that MD2 has put all the industry benchmarks (mainstream) into it (too difficult).1. Support U disk, compatible with most music formats and U disk file systems on the market APE, FLAC, WAV, MP3, M4A, WMA, AIFF, AAC, DSF, DFF, ISO, CUE, even multi-channel DTS5.1, etc. Analyze CUE and ISO in seconds. PCM up to 384k 32bit DSD hard decoding up to DSD256 Support U disk common file systems such as NTFS, EXFAT, FAT32, and support multiple partitions.2. The latest QCC5125 Bluetooth 5.0 module. At the same time, it supports APTX-HD or LDAC, which adds a lower latency aptx-ll protocol compared to CSR8675.3. USB DAC solution compatible with Amanero Italian digital interface The USB DAC solution is ATSAM3UxC, and Zishan rewrote the CPLD code to adapt to MD2. The driver is compatible with Amanero Italian digital interface. Linux, MAC, mobile phones do not need to be driven. Windows driver download address:https://amanero.com/drivers/setupuac2.exe Computer music software foobar2000, QQ music, Netease music, etc. can choose DSD: WASAPI (push): speaker (Combo384Amanero) as a USB decoder output, you can easily support PCM 384K, DSD256. The mobile phone needs to cooperate with the independent power supply board in the store to supply MD2 Connect the mobile phone after independent power supply.4. Optical input The MD2 optical fiber is designed as an input, which greatly facilitates buyers to connect TVs, set-top boxes, CDs and other audio sources. Abandoning the soaring shortage of AK4118, using the CS8416, which is extremely easy to lock frequency, the focus is on the slave mode.The CPLD+ crystal oscillator solution is used to bypass the I2S signal jitter of the CS8416. MD2 optical input supports up to PCM192K.5. Coaxial output supports DoP Simply put, it means that the DSD signal is transmitted through the coaxial cable. But at the same time, you need the decoder to support the DoP function. If the decoder DAC in your hand is a DoP-supporting decoder such as ES9038 or mojo, when you use coaxial fiber to connect to MD2 playback Real DSD signal transmission and playback can be realized when DSD music. Compared with MD1, MD2 upgrades the coaxial to PCM384K DoP128.6. Flagship CS43198 DAC chip MD2 contains two crystal company's current flagship CS43198 chips, one CS43198 per channel. The NOS filter function of CS43198 is opened, which reduces modern oversampling technology. I believe that the good quality of I2S coupled with CS43198 NOS will meet your nostalgic taste .At the same time, a plug-in op amp socket is provided for buyers to replace their favorite op amp. The current standard op amp LM4562.7. Simple but not simple power supply The host only needs a TYPE C data cable to power the whole machine. It adopts BOOST+N LDO design that has nothing to do with the input power, regardless of the quality of the input power, even if it is powered by a counterfeit charging head, it will not play a big role in the player. Impact. But it is recommended to use at least 5V 1A charging head. It also provides a voltage of up to 13V and a total of 26V for the op amp, which is suitable for most op amps in the market that require high-voltage performance.8. Comes with a cute (on the mountain) remote control With a cute (on the mountain) remote control, it is convenient for Ge You to remotely cut songs while lying down. Manual and firmware link: Link: https://pan.baidu.com/s/1aPZ2RDXd-COR3um68JXx1g Extraction code: rkej