1. The ES9039Q2M chip changes the style of the company in the past, and the sound is very delicate, sweet and transparent. The first sound feels like listening to AK4499 EX. This style has changed too much, and the sound is really comfortable. The details, the flavor, the sound field, and the dynamics are very in place. You know that this is Bluetooth, and this effect has made many traditional CD players ashamed. 2. The LPF circuit of the decoding part has been redesigned to produce a better effect, and the audio capacitor makes the sound more delicate. The filter part uses a gold robe capacitor for better performance and lower ripple. BT39 also supports the USB input function of the TPYE C port, which can be connected to a computer or mobile phone through a USB cable. 3. Improvements are constantly being made, and the cost performance of the BT39 is quite good, which can be played with those big desktop computers. 4. The BT39 Bluetooth receiver decoder uses a ES9039Q2M decoding chip, and the sound is similar to ES9038Q2M in charm and dynamics. The Bluetooth chip uses QCC5125, supports LDAC, supports 24BIT, 96KHZ bit rate transmission. Internal power supply is the basis of good sound, and the op amp part is positive or negative 12V power supply, ensuring the performance of the op amp.