Shure 545SD Classic Unidyne III Dynamic Instrument Microphone
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Description
The 545SD is a classic Unidyne III dual-impedance dynamic microphone that has been a mainstay in live sound and recording since its introduction. Its cardioid polar pattern provides uniform pickup with 15-20 dB of rear rejection, making it effective for instrument miking and public address applications. The built-in silent magnetic reed on/off switch with a lock-on option allows the microphone to be permanently set to the "on" position when desired.
Classic Design
- Unidyne III cartridge: The same iconic moving-coil element that defined Shure's legacy, delivering warm, natural instrument reproduction
- Dual-impedance operation: Switchable between low impedance (150 ohms) and high impedance via solderless connector change
- Silent magnetic reed switch: On/off switch with lock-on option eliminates switching noise during use
- Chrome-plated die-cast body: ARMO-DUR grille and stainless steel screen for lasting durability
- Uniform cardioid pattern: Consistent directionality across the frequency range with excellent feedback rejection
Specifications
- Type: Dynamic (moving coil)
- Polar pattern: Cardioid (Unidyne III)
- Frequency response: 50 Hz to 15,000 Hz
- Sensitivity (low Z): -58.0 dBV/Pa (1.3 mV) at 1 kHz
- Sensitivity (high Z): -35.0 dBV/Pa (17.6 mV) at 1 kHz
- Impedance: Dual: 150 ohms rated (250 ohms actual) / High Z
- Connector: 3-pin XLR
- Dimensions: 157 x 32 mm (6.19 x 1.25 in)
- Weight: 255 g (9.0 oz) without cable
In the Box
- Shure 545SD microphone
- Swivel stand adapter (5/8"-27 thread)














