<b>About our AIYIMA</b><br> Our design concept is to satisfy more audio enthusiasts' pursuit of sound quality. <br> 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. <br> Through your computer and other audio source input, choose our TUBE A3 PRO bluetooth vacuum tube preamp and A07 2 Channel Power amplifier, with your bookshelf passive speakers, this is undoubtedly a very perfect combination. <br> We offer Brand technical support and service,any problem ,pls ask me!thank you ver much <br> Let you enjoy HIFI music! Thank you for your choice!<br>