Hello, we are a company that sells simultaneous translation services for theaters, conferences etc. We are looking for a transmitter that can transmit the audio of our interpreter booths to our guided tours that have frequneze 794-820mhz. Others who are frequently from 863-865mgz (this frequency can not be used in italy). The product we are looking for is a very versatile transmitter so that when we change receivers we have no probabilities.We use sennheiser sl interpreter console.We will be grateful for advice from you and have the price for the purchase of the various pieces ..Thank you! Show More