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. …