About our AIYIMA Our design concept is to satisfy more audio enthusiasts' pursuit of sound quality. The use of audio electronic products needs to be used in strict accordance with the correct connection and matching, so as to achieve the maximum use effect of the product. Through your computer and other audio source input, choose the AIYIMA DAC A2 decoder match our A07 TPA3255 Power amplifier, with your bookshelf passive speakers, this is undoubtedly a very perfect combination. We offer Brand technical support and service,any problem ,pls ask me!thank you ver much. Let you enjoy HIFI music! Thank you for your choice!