Attention: Fosi series products are not compatible. Please do not purchase if using this series of machines. Thank you
Due to the wide variety of machine models, we do not have so many machines to test compatibility. Before placing an order, you can ask customer service if they are compatible with your machine model. Thank you!!! Currently, the SX22B has been found to be incompatible with the( Douk A5 )model. So friends who use Douk brand machines should pay attention··







Discrete components adopt transconductance linear current mode technology, upgrading the front-end, DAC decoder, headphone amplifier, singing amplifier, and electronic frequency divider.

Sound quality characteristics: dynamic and realistic, rich in details. The replay music soundstage framework is very precise, allowing you to immerse yourself in an extraordinary music environment; The combination of artistic conception and realm! The notes are in place, with outstanding concentration and unwavering qualities. Every subtle musical detail can be easily captured in place. The pinnacle of operational amplifiers!