What are active microphone splitters?
2.1. Dynamic Microphone Behaviour Everyday dynamic microphones are broadly assumed to have an impedance around 250 ohms. In reality, the impedance of many widely used microphones fluctuates widely at resonant points across their frequency range, up to 2500 ohms (over 10 times higher) and down to 50 ohms, or one fifth of the nominal. These impedance fluctuations aren’t a problem when microphones are plugged into a single mixer, presenting a load that’s close to the 1200 ohms specified for most microphones. The trouble starts when more than one mixer needs to be connected across each microphone. As soon as a monitoring console is added across the F.O.H. mixer, microphone loading drops to 600 ohms (fig.1). When additional mixers are added for recording and/or broadcasting, the loading falls further, down to 300 ohms when 4 mixers’ inputs are connected. The load impedance seen by microphones is often even lower at high frequencies above 5kHz, due to the capacitance of many metres of multic
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