If you setup a sound system, then need some REMOTE speakers setup further out into the audience (so you don't need your mains turned up extremely loud), it's best to run them cabled, but you can run them WIRELESS using a nifty device made by Teach Logic (http://www.teachlogic.com/products/AirLinkWirelessSystem). It's a transmitter/receiver hardware combination. They have a model which includes the necessary DELAY for remotes which are more than 50-feet out. Call one of their dealers as listed on their website, for more details.