Shure 545SD-LC Classic Unidyne Dynamic Microphone

The predecessor to the SM57, the 545SD Classic Unidyne® Instrument Microphone is a dual-impedance, unidirectional, dynamic microphone.

Shipped connected for low-impedance operation, the 545SD features a silent magnetic reed on/off switch with lock-on option. A favorite for instrument pickup and recording, the 545SD can also be used on lecterns in public address systems.

Shure 545SD-LC Features

• Exceptionally uniform cardioid pattern minimizes feedback
• Selectable dual-impedance operation
• Silent magnetic reed on/off switch with lock option
• Cable not included

• 535SD-LC classic Unidyne dynamic microphone1
• Mic clip1

• Transducer TypeDynamic
• Polar PatternCardioid
• Frequency Response50 Hz - 15 kHz
• Rated Output Impedance150 ohms (250 ohms actual)
• Output Level, Open Circuit Voltage at 1kHz
  • L: -58.0 dB (1.3 mV)
  • H: -35.0 dB (17.6 mV)
• Switchbuilt-in magnetic reed on/off switch with lockplate
• Cartridge Shock Mountinternal rubber vibration isolator
• Swivel Adapterpositive action, adjustable through 90° from vertical to horizontal, permits easy removal for handheld use, suitable for mounting on stand with 5/8 in.-27 thread
• Housingchrome-plated die casting with ARMO-DUR grille and stainless steel screen
• Weight (without cable)9 oz

About Dynamic Microphones at Sound Productions

If you’re looking for an all-purpose, heavy-duty microphone, look no further than a dynamic microphone. Equally outstanding in both the studio and live on stage, dynamic mics are an affordable, versatile, and classic option for nearly every miking application. Popular uses include live performances, studio recordings, man-on-the-street style interviews, as well as podcasts that aim for a professional “radio voice” polish.

Dynamic microphones work using a coil attached to a magnet. When sound waves cause the coil to vibrate up and down against the magnet, an electromagnetic current is induced; in simple terms, this turns the sound into an electronic signal to be channeled into a recorded version or—in the case of live sound—into a speaker to distribute the sound to the audience.