Shure Americas | 545SD Classic Unidyne® Instrument Microphone | Vintage Microphones, Retro Microphones, Legacy mics

Classic Microphones

Iconic microphones that feature elegant, renowned product design with Shure sound quality.

Downloads: User Guide; Brochure

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Cardioid Polar Pattern: Picks up the most sound in front of the microphone and some from the sides. Less susceptible to feedback in high volume environments.
Tailored Frequency Response: Smooth, extended response. Tuned to accentuate specific types of instruments, or voices.

545SDClassic Unidyne® Instrument Microphone

Shure

Dynamic: Simple, rugged diaphragm/coil. handles extreme volume levels without distortion.

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.

545SD-LC Cable not included

Exceptionally uniform cardioid pattern minimizes feedback
Selectable dual-impedance operation
Silent magnetic reed on/off switch with lock option
Cardioid, dynamic
Frequency response: 50 to 15,000 Hz

Type: Dynamic
Frequency Response: 50 to 15,000 Hz; View Larger
Polar Pattern: Cardioid (unidirectional)--uniform with frequency, symmetrical about axis
Impedance: Dual. Microphone rating impedance is 150 ohms (250 ohms actual) for connection to microphone inputs rated at 19 to 300 ohms and "High" for connection to high-impedance microphone inputs. Wired for low impedance as supplied. To change impedance, see sections on lmpedance Selection and Connections in User Guide.
Output Level (at 1,000 Hz): LOW: Open Circuit Voltage* -58.0 dB (1.3 mV); HIGH: Open Circuit Voltage* -35.0 dB (17.6 mV); *0 dB = 1 volt per Pascal (1 Pa = 94 dB SPL)

Polarity: Positive pressure on diaphragm produces positive voltage on pin 2 (with respect to pin 3).
Switch: Built-in magnetic reed on/off switch with lockplate.
Cartridge Shock Mount: Internal rubber vibration-isolator Swivel Adapter; Positive action, adjustable through 90 degrees from vertical to horizontal, permits easy removal for handheld use, suitable for mounting on stand with 5/8"- 27 thread
Case: Chrome-plated die casting with ARMO-DUR® grille and stainless steel screen
Dimensions: See User Guide
Net Weight (less cable): 255 grams (9 oz)

	Name	Availability
	S37A Desk Stand Desk Stand, gray finish, for use with various Shure swivel adaptors and shock mounts.	Where To Buy
	R45 Cartridge for 545 Series and PE54 Direct replacement cartridge for Shure 545 Series and the PE54 series microphones.	Where To Buy
	A55M Shock Mount Microphone Clip Isolation mount and swivel adapter securely attaches Shure models SM57, SM58, SM86, Beta57A, Beta58A, Beta87A, and Beta87C to standard microphone stands.	Where To Buy
	A25D Microphone Clip Securely mounts the SM58, SM57, SM87A, Beta 87A, Beta 87C and all other microphones with 3/4-inch and larger handles to a standard microphone stand.	Where To Buy
	A26M Dual Microphone Mount Allows two Shure SM57, Beta 57A, or 545 Series microphones to be placed vertically on a standard microphone stand.	Where To Buy
	A55HM Snap-in "Shock Stopper" Mount Shock Stopper Isolation Mount/Swivel Adapter, Half Mount, for SM57, SM58, Beta 57A, Beta 58A, Beta 87A, Beta 87C or any Shure tapered handle mic.	Where To Buy