Thank you for answering @Rob Watts Rob. Much appreciated. The other day i have tried installing the ifi idefender 3.0 (used to cut the vbus from source) but it needs a clean power connected through its female usb micro slot on the idefender. I didnt connect any power but it still worked. That is why im asking this question. Cause without the power the qutest still recognized the macbook pro. Can you please clarify @iFi audio ? Thank you.