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Why do large horns have slots machined into their sides?

horns large machined slots
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Why do large horns have slots machined into their sides?

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When a horn s diameter or length is greater than 3.5 inches to 3.75 inches, side motion and transient frequencies can alter the amplitude at the horn s face and create internal stress. Machining slots into the sides of the horns overcomes those problems. The slots divide the horn into smaller, individual horns, ensuring uniform amplitude and relieving the internal stress.

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