6. Multi-Mic Systems
The choice of receiver should be based on both where it will be used and the complexity of the wireless system, as both will have a bearing on the level of interference and the number of channels required. Cheaper systems generally only have a fixed single channel rather than the ability to tune to a particular frequency. This is fine if youll only use a few mics, providing you ensure when you purchase them that each one has a different frequency. Manufacturers often colour code the boxes to make this easier. With multi-mic systems however, where more complex frequency management is necessary, a receiver that can tune to a range of different frequencies is required. You should also consider whether a diversity receiver is appropriate see the Key Terms section for a full explanation.
Transmitters require power over and above anything that might be provided for the mic itself, and this will either be in the form of standard alkaline Duracell type batteries, or a rechargeable battery pack supplied with the transmitter. Alkaline batteries generally last up to about six hours, as opposed to around three for rechargeables - either way, make sure you have full power before the show begins!