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Shure UNIDYNE III 545SD-LC Dual Impedance Unidirectional Microphone 

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The UNIDYNE III Model 545SD is a dual-impedance, unidirectional, dynamic microphone. Shipped connected for low-impedance operation, the mic features ...Click To Read More About This Product

Available 05-16-2017

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OVERVIEW

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).

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

Order today for Shure quality at an affordable price.

SPECIFICATIONS

UNIDYNE III 545SD-LC Dual Impedance Unidirectional Microphone

  • 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)
Reviews
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Review Snapshot

by PowerReviews
ShureUNIDYNE III 545SD-LC Dual Impedance Unidirectional Microphone
 
5.0

(based on 7 reviews)

Ratings Distribution

  • 5 Stars

     

    (7)

  • 4 Stars

     

    (0)

  • 3 Stars

     

    (0)

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  • 1 Stars

     

    (0)

100%

of respondents would recommend this to a friend.

Reviewed by 7 customers

Displaying reviews 1-7

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(7 of 7 customers found this review helpful)

 
5.0

Not Vintage, but great

By tdc9

from Pittsburgh

See all my reviews

Comments about Shure UNIDYNE III 545SD-LC Dual Impedance Unidirectional Microphone:

I have found these to be more useful for studio applications and other live applications. In the studio, I have used these for guitar cabinets, acoustic guitars (soundhole and 12th fret), drum overheads (not as good as condensers), snares, toms, and vocals. Live, I have used them on guitar cabinets, vocals, drums, drum overheads, as well as acoustic guitars. I HIGHLY recommend this mic. It reproduces sound very well and is a very "transparent" mic. It has a fantastic frequency response and is more sensitive than an SM57. I would not recommend this over an SM57 for percussion use, but I think it easily surpasses the 57 in vocal reproduction ability. It is better than 57s on guitar cabinets, but I would not recommend it over an e609. However, if you're looking for a GREAT all-purpose mic, buy one or 2 of these. They are great for just about anything and will not sound bad in almost any application (just don't stick it in a bass drum).

(6 of 6 customers found this review helpful)

 
5.0

Even More Useful Than the 57

By Steve B

from Graceville Fl

About Me Professional Musician

See all my reviews

Ask me a question

Pros

  • Durable
  • Versatile

Cons

    Best Uses

    • Performances
    • Professional Recording

    Comments about Shure UNIDYNE III 545SD-LC Dual Impedance Unidirectional Microphone:

    Is there really a substantial difference between the sound of a 545 and an SM57? I don't know; they are certainly very similar and it IS one of the most useful sounds in recording. Where the 545 is different is 1) the on/off switch -- useful when used as a live mike -- and 2) the variable impedance.

    The latter is the main reason I have one. It's great to able to plug it into an amp and use it for harmonica or the like. There are times one simply needs that high-impedance quarter-inch connection. And, after all, if you don't find yourself needing that, just set it to low-impedance and use for much the same roles as a 57.

    (6 of 7 customers found this review helpful)

     
    5.0

    Better than the SM57

    By Seth Easton

    from West Virginia, USA

    About Me Experienced

    See all my reviews

    Ask me a question

    Pros

    • Clear Sound
    • Durable
    • Easy To Use
    • Versatile

    Cons

    • Limited Functions

    Best Uses

    • Amateur Recording
    • Mic Cabs
    • Vocals

    Comments about Shure UNIDYNE III 545SD-LC Dual Impedance Unidirectional Microphone:

    I had no idea Shure was still selling this mic, and I was pleasantly surprised to see it here. I had an old Unidyne from the 70s that I had acquired and was using up until a few years ago when it finally died. This mic was incredible on guitar cabs and vocals. It had such a smooth response to everything and didn't have proximity effect that some other cardiod mics have. I bought an SM57 to replace it, but it's not nearly as good. I could stick this thing in front of any cab at nearly any distance and get a superb sound. With the SM57, you have to play around with placement. Overall I love this mic and I will be purchasing another one. Hopefully, Shure is building it to the same specs so it will have the same quality and ruggedness of the original.

    (5 of 5 customers found this review helpful)

     
    5.0

    I would buy this product again

    By Harmonica Man

    from Duffield, Virginia

    About Me Novice

    Verified Buyer

    Pros

    • Clear Sound
    • Easy To Use
    • Had A Clear Sound
    • Looks Nice Sounds Great

    Cons

    • none

    Best Uses

    • Fender Pa Syatem
    • Home Audio
    • Home Studio

    Comments about Shure UNIDYNE III 545SD-LC Dual Impedance Unidirectional Microphone:

    I like this mic, It sounds great and looks nice I use it with my Fender Pro 300 system playing harmonica.

    (5 of 5 customers found this review helpful)

     
    5.0

    Great drum mike

    By vintagedrummer

    from Springfield,MO

    See all my reviews

    Comments about Shure UNIDYNE III 545SD-LC Dual Impedance Unidirectional Microphone:

    I've seen the other reviews and can tell you from years of experience- it's a great drum mic. If it wasn't, John Bonham wouldn't have used it live and in the studio over 30 years ago. I still have an old high impedance model from '68!

    (4 of 4 customers found this review helpful)

     
    5.0

    Awesome Mic

    By Ryan Confer

    from Nebraska

    Comments about Shure UNIDYNE III 545SD-LC Dual Impedance Unidirectional Microphone:

    Don't hesitate to buy this microphone. It is perfect for live or studio applications. Especially for snare drum and guitar cabs.
    The on/off switch is just a cool feature that makes it stand out.
    This mic is very sturdily built, and can be hit by drum sticks as much as you want!
    Don't spend any more for an all around microphone. This mic is the best for snare and guitar cabinets.

    (3 of 3 customers found this review helpful)

     
    5.0

    Its a shure, nothing else really needs to be said

    By AP0LL0PA

    from pittsburgh pa

    About Me Experienced

    See all my reviews

    Verified Buyer

    Comments about Shure UNIDYNE III 545SD-LC Dual Impedance Unidirectional Microphone:

    very good quality microphone. its what you expect from shure. very well made. dont let the made in china deter you.sound reproduction is outstanding.

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