![]() ![]() Now that we knew what we were looking for, we set out to determine how easy or difficult it might be to find this information. If the microphone connections are not properly matched to the device's input connector, there may be no audio, or funny sounding audio, or the microphone might be damaged if there is an unexpected voltage appearing on the device's connection points.Īnd finally, just because two connectors mate does not mean that each is wired the same. In the Shure product line, there are different wiring schemes available depending on the microphone model. It is imperative that the circuit function of each connection point be known so that the proper microphone wiring can be determined. Common circuit functions include: ground, audio send, audio return, and DC bias. This specification will be the name of the connector, such as: XLR female, 3.5 mm mini-phone jack, TRS 1/4 inch female phone jack, screw terminals, TINI QG connector.Įach of these connectors has at least two connection points and most have three (or more) connection points. Vital Microphone Input Specification #3a, #3b, And #3cĪ) The type of microphone input connector on the deviceī) How many connection points are inside the connectorĬ) What is the function of each connection point If a microphone is selected whose impedance is greater than the device's input impedance, the microphone will not deliver its full signal level to the device and the audio will be noisy and low in level. If a microphone is selected whose impedance is lower than, or equal to, the device's input impedance, the microphone will work as long as it provides the proper signal level - see #1 above. ![]() In the Shure product line, there are different impedances available depending on the microphone model. Contrary to popular audio mythology, the impedance of a microphone does not need to exactly match the input impedance of the device. This specification will be given in ohms. Proper matching of the microphone's signal level to the device's required input level is imperative.Ĭalled 'input impedance' or 'actual input impedance', this specification is important as it determines the proper impedance range of the chosen microphone. If a microphone is selected whose signal level is too great for the device, the audio will be distorted and unintelligible. If a microphone is selected whose signal level is too low for the device, the audio will be noisy and low in level. In the Shure product line, there is a wide variation of microphone signal levels available depending on the model. This specification might be given in millivolts (mV), or volts (V), or in a minus dB form (-dBV, -dBm, -dBu, -dBs). Typically, these specifications will be provided in the Owner's Manual, most of which (for current or recent products) are online and free.Ĭalled 'Input Sensitivity' or 'Nominal Input Level', this specification indicates how strong of a signal the microphone must supply to satisfy the microphone input of the device. To select the proper microphone, it is essential to have specifications for the microphone input of your device. Instead, we've provided a few signposts that will help your navigate this sometimes-frustrating journey. ![]() It's Apps' mission to problem-solve.Īccording to Apps chief Michael Pettersen, one recurring question is: " Will my microphone (wired or wireless) model 'X' work with my whatchamacallit?" Or " Why doesn't my Shure mic work as expected with my new i-Thingamabob?" While we'd love to have the microphone input specifications of every device in the world that needs a microphone, it's just an impossible task. They come every day from customers all over the world through a variety of channels - email, phone and via the interface on the company's Find An Answer (FAQ) database. The eight-member team of Shure's Applications Engineering Group gets a lot of questions.
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