From the course: Microphone Techniques: Essentials
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Impedance
From the course: Microphone Techniques: Essentials
Impedance
- Now when we consider impedance on a microphone this Shure SM57 says it's impedance is 150 ohms. Most microphones that are professional microphones have a balanced output anywhere from 50 ohms up to 1,000 ohms. Almost all of them fit between 50 ohms and 600 ohms. What we need to take away from that information is just that we connect those microphones to inputs that are also low impedance inputs. Those impedance's don't need to match exactly. In fact, for a 150 ohm microphone output, you might see a spec that says it's ideal to connect it to a 1500 ohm input. 1500 ohm input is still low impedance. High impedance starts around 10 or 20,000 ohms and it doesn't work to connect low impedance devices with high impedance inputs, or vice versa, high impedance devices with low impedance inputs. There are some pre empts that actually let you set the the pre empt input impedance manually so that you can specifically match the pre empt input to the microphone output.
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Contents
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Reading the frequency response chart4m 36s
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The proximity effect1m 30s
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Evaluating the Neumann KM 84 and KM 1841m 52s
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Evaluating the Shure SM582m 27s
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Evaluating the Royer R-122 MKII2m 14s
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Evaluating the Audix D61m 20s
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Evaluating the Shure Beta 872m 9s
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Blind evaluations of three mics3m 17s
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Polar graphs and sensitivity2m 12s
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Polar pattern shapes5m 7s
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Demonstration of polar patterns4m 32s
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Frequency variations2m 31s
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Sensitivity6m 46s
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Impedance1m 3s
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Equivalent noise1m 38s
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Maximum sound pressure level (SPL)4m 8s
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