Using Wireless Mic w/ Surround Sound

by Kevin
(Versailles, OH, USA)

I just built a new shop for my business in order to give presentations for new equipment coming out in the agricultural industry. The shop is 100' x 60'. I currently have a Sony 200W 2 Ch. Audio Receiver with 4 speakers running off that to each corner of the shop. I would like to get a wireless microphone and have the audio go through that particular receiver/speakers. However, I don't even know if this is possible. The only systems I see are the ones that you wear the Mic receiver on your hip. What options do I have? Any help would be greatly appreciated. Thanks!