I play the songs in my music collection primarily from my iMac desktop computer, using iTunes (v. 220.127.116.11). But, I would like to improve the experience by playing them wirelessly via my 5.1 surround system. That's controlled by my Denon AVR-1912 receiver (https://usa.denon.com/us/product/hometheater/receivers/avr1912). How can I do this? I connected an iogear Universal Wi-Fi N adapter to the Denon and can now listen to internet radio on the receiver. But, how do I link the iMac to the receiver or otherwise play the music stored on my computer? Neither device seems to recognize the other via my local network. Do I have to use Apple AirPort Express instead of my current adapter? Please advise. Thanks.