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Item # 270939 | Customer Ratings: Ratings ( 5 Based on 2 reviews)

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Shure UNIDYNE III 545SD Dual Impedance Unidirectional Microphone
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      Shure UNIDYNE III 545SD Dual Impedance Unidirectional Microphone (270939)
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A favorite for instrument pickup and recording.

The UNIDYNE III Model 545SD is a dual-impedance, unidirectional, dynamic microphone. Shipped connected for low-impedance operation, the mic features a silent magnetic reed on/off switch. The UNIDYNE III is a favorite for instrument pickup and recording, and can be used on lecterns for public address systems such as those used in political conventions and legislatures, convention halls, hotels, public auditoriums, stadiums, schools, and churches. (545SD-LC Cable not included).

Shure UNIDYNE III 545SD Dual Impedance Unidirectional Microphone Features:

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


Shure UNIDYNE III 545SD Dual Impedance Unidirectional Microphone Specifications:

  • Type: Dynamic
    Frequency Response: 50 to 15,000 Hz
    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.
    Output Level (at 1,000 Hz): Open Circuit Voltage*: Low: -58.0 dB (1.3 mV); High: -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 (Length x Diameter): 6-3/16" x 1-1/4" (157 x 32 mm)
    Net Weight (less cable): 9 oz (255 grams)


Shure UNIDYNE III 545SD Dual Impedance Unidirectional Microphone

One year warranty on wireless mics, mixers, and circuitry products.
2 year warranty on wired mics.
Warranty terms vary. Check with manufacturer for specific product warranty.

Get your gear covered!

Now you can get added warranty protection for your new gear. Pro Coverage steps in where the manufacturer's "normal wear and tear" ends. Our PRO COVERAGE program offers you UPGRADED COVERAGE if your product ever fails!

Pro Coverage includes:

  • Accidental damage protection (new gear only)
  • Expedited Repair
  • Free Shipping (for returns or repairs)
  • 100% Coverage for Commercial Use
  • Extended Return Period
  • Extended Price Protection
  • No Lemon Guarantee
  • Free Transfer of Coverage to a new owner
  • Repair Costs Covered for up to 3 years from date of purchase
  • Repairs Can Be Authorized Toll-Free by Phone or the via the web
Product Reviews
(Based on 2 reviews)
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Viewing Reviews 1 - 2 of 2 |
  • Great harp mic

    As reviewed by gc on 4/7/2011

    This is my first mic for harmonica but I have to say that it does crunch up great when cupped. I am starting to get the hang of it and there are a lot of different tones you can get by the different ways of cupping this mic. I am using it thru a vox ac4tv amp and it sounds good to my ears.I swapped in an amperex 12au7 in the amp and feedback is no problem.

    1 of 1 people found this review helpful.
    Was this review helpful?
  • Great mic

    As reviewed by Greg on 4/7/2011

    I am using this for harmonica and it has great tone. This is my first mic so I am no expert but I love it and am not disappointed.

    1 of 3 people found this review helpful.
    Was this review helpful?
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