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What's the Difference Between the SM58 and the Beta58A?

What's the difference between the SM58 and its supercardioid cousin the Beta 58A? Both of these Shure mics are characterized by sound quality and reliable performance, however, there are differences that suit specific applications.

March, 26 2013 |

Our technical team here at Shure are regularly asked to describe the difference between our classic SM58 and its closely related cousin, the Beta 58A. Firstly, let's be clear: this is not a question of better or worse – both microphones are characterized by outstanding sound and performance. However, each model has key fundamental strengths suitable for different applications. Here are some of the key differences to bear in mind...

Polar Pattern:

Perhaps the most obvious difference is the microphone polar pattern. The SM58 has a cardioid polar pickup pattern, while the Beta 58A is a supercardioid. The polar pattern subsequently affects how you should use the microphone and where it would be most appropriate.

A cardioid microphone will reject best from the back while a supercardioid microphone will reject better from the sides. Both microphones pick up sound best from the front, but a supercardioid polar pattern has the added advantage of being more directional and therefore less susceptible to feedback when using correctly placed stage monitors.

Output Level:

Due to its neodymium magnet, the Beta 58A has greater sensitivity and a 4dB hotter output than the SM58.

Frequency Response:

The Beta58 has an extended low-end and high-end compared to the SM58. This does not necessarily mean the Beta58 is better, and depending on the style/tonal characteristic of your voice, you may or may not benefit from the extended frequency response.

Handling Noise:

The Beta 58A is quieter than the SM58 due to its advanced pneumatic shock mount system.

Grille:

The Beta 58A has a hardened grille, which makes it more difficult to dent.

Summary

To summarize, the Beta 58A is no doubt an upgrade for many applications, but in some scenarios, these upgrades can also be a hindrance. For example, if you're performing in a heavy-metal band, and you typically shout or scream into your mic - you may not want the extra sensitivity and detail of the Beta58. It's all a matter of application and taste - which do you prefer?

For further information on choosing the right microphone, you may find our previous post on "How to Choose the Best Microphone for Vocals" helpful.

Further mic comparison posts available on this website:
SM57 vs Beta 57

Marc Henshall

Marc forms part of our Pro Audio team at Shure UK and specialises in Digital Marketing. He also holds a BSc First Class Hons Degree in Music Technology. When not at work he enjoys playing the guitar, producing music, and dabbling in DIY (preferably with a good craft beer or two).