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level of sound pressure before clip or distortion, the better. Frequency Response - The frequency response curve illustrates the microphone’s ability to transform acoustic energy into electric signals, and whether it will do so faithfully or will introduce colouration. With frequency response charts, the rule of thumb is the more linear (flat) it is, the better. Phase Response – In terms of microphone impulse response it is important that microphones react to transients in a constant way to avoid anomalies such as phase cancellation. This is especially important where multiple microphones are used. It is always wise to be aware of the phase response of a particular microphone and ensure any combinations of microphones are well matched. When is it best to use an Omnidirectional Microphone? By far the most popular types of lavalier microphone used in broadcast are omnidirectional, and are ideal in a controlled environment. With these microphones artists are able move around and turn their heads without affecting the sound quality and level. This is applicable to both lavalier and headset microphones, except you will have a much higher signal to noise ratio with the headset mic because the capsule is that much closer to the sound source. What about Cardioid and Super Cardioid? When should I use these? Miniature cardioid mics are becoming more widely used because of the style of modern TV and Film recording. For example, reality shows are frequently shot in a documentary style and often outside, while game shows increasingly use PA systems for audience monitoring. As the ambient noise is that much higher, directional microphones are favoured to acquire more separation and better sound quality. In very hostile environments there is often no other alternative than to use a highly directional Super Cardioid microphone. What are the advantages of a headset microphone over a lavalier mic? The simple answer is the proximity of the microphone to the sound source. The closer it is the more sensitive it is. Unlike cameras you cannot zoom a microphone capsule – unfortunately. Can lavalier mics and headset mics be used on a wireless system – if so what do I need? Yes they can, especially if you are using a DPA miniature capsule as all of these are designed to be used with both 48V phantom powering. DPA also has a clever adapter system that matches to all professional wireless beltpacks. It is simply a matter of choosing the correct adapter. TV-BAY MAGAZINE: ISSUE 77 MAY 2013 | 59 TV-BAY077MAY13.indd 59 02/05/2013 21:19