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[. . . ] The Gradav Microphone Guide
Selecting a microphone for a particular task can be difficult. We have prepared this guide as an introduction to microphones currently available for Hire from us, with suggestions for use. As microphone choice can be a very personal matter, we recommend you use our guide as a starting point and develop your own preferences with experience. [. . . ] This value is generally higher than the `DC' resistance. Most modern microphones are designed to operate with an impedance around 200 ohms. Balancing An unbalanced signal uses only 2 conductors. One is for signal, the other is a ground reference (screen). A balanced signal still needs an overall screen, but the signal is carried on 2 conductors working together in a push/pull arrangement. Noise eg hum, that is induced in the conductors are summed. The induced noise signals are equal but completely out of phase, and so they cancel. To unbalance a balanced signal link the `out of phase' (cold) signal to the screen. Pickup Patterns Most of the microphones we use are more sensitive in some directions than others. Select a microphone whose directional characteristics best suit the task in hand. Although discussed in 2 dimensions, you will need to remember that pickup patterns are 3 dimensional. Below are listed the most popular pickup patterns we supply.
CARDIOID SUPER CARDIOID (SHORT) SHOTGUN OMNI Good rear rejection with a wide frontal pickup. This has a better rear rejection and a narrower frontal pickup with a `reach' that is longer than the standard cardioid. A still narrower frontal pickup, with an even longer reach. [. . . ] What is a good microphone for over the stage?Flown over the stage, these microphones need to be sensitive enough to pickup well at a distance, but not so directional that `hot' and `cold' spots appear. The capacitor Short Shotgun fills this role well.
Gradav Hire & Sales Ltd
Unit C6 Hastingwood Trading Estate Harbet Road, London N18 3HU
Phone 020 8803 7400 FAX 020 8803 5060 email office@gradav. co. uk [. . . ]
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