Shure SM58 vs Beta 58A: Differences, Sound & Which One to Choose

Shure SM58 and Shure Beta 58A are two of the most recognizable professional vocal microphones in the world. Both are designed for reliable stage performance, but they differ in polar pattern, sensitivity, frequency response and the way they behave in demanding live environments.

If you are deciding between the SM58 and Beta 58A, it is important to understand that the question is not simply which microphone is “better”. Each model has its own strengths and may be better suited to a particular voice, stage environment or microphone technique.

You can explore the full range of Shure products available from Soundmart, including wired microphones, wireless systems, capsules and accessories.

Shure SM58 vs Beta 58A: Key Differences

Although the two microphones look similar, there are several important technical differences:

• Shure SM58 uses a cardioid polar pattern.
• Shure Beta 58A uses a supercardioid polar pattern.
• Beta 58A provides approximately 4 dB higher sensitivity.
• Beta 58A offers a more extended low- and high-frequency response.
• Beta 58A features a more advanced system for reducing handling noise.
• Beta 58A uses a hardened grille designed to better resist dents and deformation.

Important: The Comparison Also Applies to Shure Wireless Microphones

The differences between the SM58 and Beta 58A are not limited to their standard wired versions. They are also relevant when comparing Shure wireless vocal microphones equipped with the corresponding microphone capsules.

When a compatible wireless handheld transmitter uses an SM58 or Beta 58A capsule, the fundamental acoustic characteristics of that capsule remain relevant. These include:

• polar pattern;
• frequency response;
• sensitivity;
• overall vocal character;
• off-axis rejection;
• handling behaviour.

The wireless system itself determines parameters such as RF performance, operating frequencies, transmission technology, range and additional features. The microphone capsule, however, remains one of the key components determining how the voice is captured.

Polar Pattern: Cardioid vs Supercardioid

One of the most significant differences between the Shure SM58 and Beta 58A is the way each microphone picks up sound.

Shure SM58: Cardioid Polar Pattern

The SM58 uses a cardioid polar pattern. It captures sound primarily from the front and provides its strongest rejection directly behind the microphone.

This makes it relatively easy to use and more forgiving when positioning stage monitors. It is one of the reasons why the SM58 is widely used in clubs, concert venues, rehearsal rooms, rental systems and many different types of live events.

Shure Beta 58A: Supercardioid Polar Pattern

The Beta 58A uses a supercardioid polar pattern. Its front pickup area is narrower and more focused, while rejection from the sides is stronger.

This can be a major advantage on loud stages where drums, guitar amplifiers, monitors and other instruments are positioned close to the vocalist. The tighter pickup pattern can help improve vocal isolation and reduce the amount of unwanted stage sound entering the microphone.

With a supercardioid microphone, however, correct monitor placement becomes especially important because the pattern includes a small area of sensitivity at the rear of the microphone.

Sensitivity and Output Level

The Beta 58A uses a neodymium magnet and provides approximately 4 dB higher sensitivity than the SM58.

In practical terms, the Beta 58A generates a stronger electrical signal at the same sound pressure level. Depending on the mixer or microphone preamp, this may allow the input to operate with less gain.

This can be useful for singers with softer voices or in applications where a stronger vocal signal is desirable. Higher sensitivity, however, does not automatically make the Beta 58A the best option for every performer.

Frequency Response and Vocal Character

Both models are designed primarily as professional vocal microphones, but their sound character is not identical.

The Shure SM58 is known for its familiar and proven vocal response. Its sound has become a standard on live stages and works successfully with a wide variety of voices.

The Shure Beta 58A has a more extended response in both the lower and higher frequencies. This can provide a more open and detailed sound with additional clarity and definition.

An extended frequency response is not necessarily better for every voice. Depending on the singer's tonal character and performance style, the familiar response of the SM58 may fit the mix more naturally.

Proximity Effect and Vocal Technique

Both the SM58 and Beta 58A are directional dynamic microphones and can emphasize low frequencies when used very close to the sound source. This phenomenon is known as the proximity effect.

A singer performing very close to the grille may achieve a warmer and fuller sound. Moving slightly further away can reduce the low-frequency emphasis and produce a more balanced result.

Good microphone technique therefore remains important regardless of which model is used.

Handling Noise

Both microphones use internal pneumatic shock mounting designed to reduce mechanical noise created when the microphone is held or moved.

The Beta 58A uses a more advanced pneumatic shock mount system and generally provides improved isolation from handling noise.

This can be particularly useful for performers who move around the stage and frequently reposition the microphone during a performance.

Grille and Durability

The SM58 has built a legendary reputation for durability and has been used for decades in professional concerts, tours, venues and rental applications.

The Beta 58A is also designed for demanding professional use but adds a hardened grille that provides additional resistance against dents and deformation.

If you already own a Shure microphone or compatible wireless transmitter, you can also explore Shure replacement microphone parts and capsules.

Shure SM58 vs Beta 58A Comparison

When Should You Choose the Shure SM58?

The SM58 is an excellent choice for anyone looking for a versatile, predictable and proven professional vocal microphone. Its cardioid pattern and classic vocal response make it suitable for a wide range of applications.

The SM58 is particularly well suited to:

• live vocals;
• clubs and smaller venues;
• rehearsal rooms;
• rental and live sound companies;
• speech and presentations;
• performers who prefer a more forgiving microphone.

When Should You Choose the Shure Beta 58A?

The Beta 58A is particularly useful when higher sensitivity, tighter directionality and stronger isolation from surrounding sound are required.

It can be an excellent option for:

• loud concert stages;
• professional vocalists;
• dense live mixes;
• stages with several instruments and monitor speakers;
• performers looking for additional detail and higher output;
• applications where surrounding stage noise needs to be minimized.

SM58 or Beta 58A for a Wireless System?

The same basic acoustic principles apply when selecting a wireless microphone.

A wireless handheld transmitter fitted with an SM58 capsule retains the characteristic cardioid pickup and familiar vocal response of the SM58. A transmitter equipped with a Beta 58A capsule provides the tighter supercardioid pattern, higher sensitivity and extended frequency response associated with the Beta 58A.

This means the choice between the two capsules remains important whether you are selecting a wired microphone or a professional Shure wireless system.

Browse the available Shure wireless vocal microphones at Soundmart.

Shure SM58 or Beta 58A: Which One Should You Choose?

If you want a proven, versatile and easy-to-use stage microphone, the Shure SM58 remains one of the established standards in professional live sound.

If you prefer a tighter pickup pattern, higher output, stronger side rejection and a more detailed vocal response, the Shure Beta 58A may be the more suitable option.

The most important factor, however, remains the individual voice. A microphone that sounds excellent with one vocalist may not necessarily be the ideal choice for another. Whenever possible, comparing both microphones using the same vocalist and sound system is the best way to determine which one works better.

Explore all Shure products at Soundmart or browse our selection of professional vocal microphones.

Information Source

The main technical specifications and comparison points in this article are based on information published by Shure Incorporated:

Shure – What's the Difference Between the SM58 and the Beta 58A?

This article has been independently rewritten, expanded and adapted for informational purposes.