Your post is quite difficult to understand. You seem to be connecting via a DJ Tech RCA2 USB interface ie sound in via USB not via your mic. Your mic is picking up everything in the room and is not recording from the hifi.
I've never used the DJ Tech interface nor USB sound input but suggest that the instructions should have told you how to configure the sound input. When you right click on the speakers symbol in system tray and open recording devices is a USB input shown?