We have created LiveVoice in a way that it will use only very little bandwidth. Technically, for example with a 100 Mbit connection, you can provide LiveVoice to about 1400 listeners!
To test the speed of your internet connection, we have a speed-test site for you.
Please note: Most standard WIFI routers have a limit of 250 devices that can be connected at the same time. But if you have expect more than 250 visitors at you event, we are sure your technical staff will offer more than one router anyways 😉