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Shure Develops New A300SM Shock Mount For The KSM353 Ribbon Microphone

Securely mates to the microphone while complementing the simple metallic styling of the KSM353

Shure has introduced the A300SM, a new shock mount for the KSM353 ribbon microphone.

More than 18 months in development, the mount provides exceptional isolation, securely mating to the microphone while complementing the simple metallic styling of the KSM353.

The KSM353’s 1.5-pound weight and lack of a secure attachment point posed distinct challenges to achieving these goals.

“Shock mounting a heavy microphone is a delicate balancing act,” explains Chad Wiggins, director of wired microphones at Shure. “If the support straps are too compliant, the mount is floppy and bottoms out. If they’re too tight, the mount won’t isolate well. And, for a ribbon microphone, you want the movement of the mount to be perpendicular to the movement of the ribbon, which complicates the design.”

The first step in the development of the new mount was to redesign the bottom connector of the microphone to accept the ShureLock thread design. A standard feature on the mounts for Shure KSM Series microphones, the mount threads onto the bottom of the microphone, holding it securely regardless of orientation or stand movement.

A particular challenge was the choice of material that would actually provide the isolation. In place of the traditional elastic bands or rubber o-rings found in most shock mounts, the A300SM employs wire rope.

“Our director of mechanical engineering had previous experience shock mounting delicate military equipment using wire rope, but we had no idea if it would work well with a microphone,” notes Wiggins.

Prototype mounts using samples of wire rope from a variety of suppliers were tested extensively, until one with the right flex characteristics, finish, and durability was found.

The new A300SM mount meets Shure’s standards, including surviving multiple drops and maintaining finish quality after exposure to humidity and corrosive environments.

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