One is that it does not provide I2S MCLK signals. The other is that its 24M crystal oscillator is used in addition to frequency multiplication for BT 2.4G band use, but also divides 44.1k 48k. 96k comes out to I2S, and non-integer frequency division, CSR8675 does not have fractional frequency division, you can imagine how bad the quality of I2S that comes with CSR8675, even the frequency is not accurate. For the first point, most of the solutions on the market are used DACs that do not require MCLK such as ES9038K2M or PCM5102. For the second point, some manufacturers use Bluetooth SPDIF signals and then use DIR9001 chips to convert I2S, which are better solutions. Our perfect solution is: CPLD provides I2S signal to Bluetooth, Bluetooth follows this I2S signal, only responsible for spitting data, not generating clock signal. It is really implemented on ZS-MD1. Now the Bluetooth of ZS-MD1 works in slave mode. When connecting to a mobile phone for -HD or LDAC, safely say that it basically meets the definition of HIFI. Colour:black+silver Material:Metal Size:28 x 84 x 80mm Package Contents: 1 x Player Decoder Host 1 x USB Cable 1 x Remote Control(2 AAA batteries not included) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. 4. BOOST+N LDO design of input power supply.Only a TYPE C data cable is needed to power the host.Adopting BOOST+NLDO design that has to do with input power supply, charging power supply will not have a big impact on the player.It is recommended to use at least 5V 500mA charging .It also provides operational amplifiers with a voltage of up to ±13V and a total of 26V, which is suitable for most operational amplifiers in the market that require high-voltage performance. 2. Complete interfaces and functions and mini size.With LCD, five-way button, coaxial, optical fiber, , 3.5 headphone jack lineout. Can connect to U disk, support multiple partitions, support multiple file systems NTFS, EXFAT, FAT32. Can be connected to mobile phone Bluetooth, support for -HD and LDAC at the same time. Connected to USB, used as a USB .Compact size 28x84x80mm. It is a good solution for your home HIFI, car, laptop USB sound card, square dance, etc. 5. Deeply customized CSR8675.Realize slave mode work of Bluetooth CSR8675.There are many products using Bluetooth CSR8675 on the market, but CSR8675 has two fatal problems. 3. NO PLL and ALL Signal comes from CPLD.Dual crystal oscillators + CPLD I2S solution. All signals come from CPLD and there is no frequency multiplication phase-locked loop. Audio crystal oscillator is divided by CPLD until the .CPLD takes over the main control and Bluetooth I2S, and at the same time synthesizes SPDIF signal output in real time. 1. Compatible with most music formats and U disk file systems on the market.For APE, FLAC, WAV, MP3, M4A, WMA, AIFF, AAC, , , , CUE, even multi-channel DTS5.1, etc.Analyze CUE and 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.