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Shure UNIDYNE III 545SD-LC Dual Impedance Unidirectional Microphone  

Item #: 
1274034494368
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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 a silent magnetic reed on/off switch. The UNIDYNE I... Click To Read More About This Product

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$8795.00
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Overview

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
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)
Warranty
MANUFACTURER'S WARRANTY
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.


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  • Customer Reviews
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Review Snapshot

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

(based on 9 reviews)

Ratings Distribution

  • 5 Stars

     

    (9)

  • 4 Stars

     

    (0)

  • 3 Stars

     

    (0)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (0)

100%

of respondents would recommend this to a friend.

Pros

  • Durable (3)
  • Easy to use (3)
  • Versatile (3)

Cons

No Cons

Best Uses

No Best Uses

Reviewed by 9 customers

Displaying reviews 1-9

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(1 of 1 customers found this review helpful)

 
5.0

Good for just about everything.

By Kit

from Fresno, Ca

About Me Experienced

Pros

  • Durable
  • Easy To Use
  • Versatile

Cons

    Best Uses

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

      The versatility of this mic is astounding. I was torn between this and an SM57 for use as a harmonica mic. With a 57, I would need an impedance transformer, since I'm going straight into a guitar amp. The pro sound tech at Guitar Center suggested this one, because he said the high end resnponce was better. The fact that it switches to high impedance was just a bonus. I'm blown away. Not only is the sound great, but depending on distance, gain, and how the mic is handled, there's a whole range of tones this mic is capable of. By the way, switching the mic from low to high impedance was VERY simple, and only took about a minute, beginning to end, thanks to the clear instructions that came with it.

      (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

      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

        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.

        (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.

        (1 of 3 customers found this review helpful)

         
        5.0

        Great mic

        By Greg

        from Granby ct

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

        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 1 customers found this review helpful)

         
        5.0

        Great harp mic

        By gc

        from granby ct

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

        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.

        (5 of 5 customers found this review helpful)

         
        5.0

        Great drum mike

        By vintagedrummer

        from Missouri

        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!

        (6 of 6 customers found this review helpful)

         
        5.0

        Not Vintage, but great

        By tdc9

        from Pittsburgh, PA

        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).

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