---
title: "Diaphragm horn"
description: "A diaphragm horn is a sonic horn in which the cleaning sound is produced by a metal diaphragm vibrating at its design frequency under pulsed compressed-air pressure. The diaphragm — typically titanium or 316 stainless steel — sits between the air-supply chamber and the throat of the bell horn and is the part most exposed to wear."
canonical_url: "https://sylio.co/glossary/diaphragm-horn"
last_updated: "2026-06-28T02:29:28.953Z"
---

A **diaphragm horn** is a [sonic horn](/glossary/sonic-horn) in which the cleaning sound is produced by a metal diaphragm vibrating at its design frequency under pulsed compressed-air pressure. The diaphragm — typically [titanium](/glossary/titanium-diaphragm) or [316 stainless steel](/glossary/aisi-316-316l-stainless) — sits between the air-supply chamber and the throat of the [bell horn](/glossary/bell-horn) and is the part most exposed to wear.

## How it generates sound

Compressed air admitted by a [solenoid valve](/glossary/solenoid-valve) raises pressure behind the diaphragm. At the design frequency the diaphragm flexes inward, vents the chamber, snaps back under spring tension, re-pressurises and repeats — a self-sustaining oscillation that converts steady air supply into a tonal acoustic output. The bell then amplifies and projects the wave into the vessel.

## Why it dominates the market

Most low-to-mid-frequency industrial sonic horns are diaphragm-driven because the design is mechanically simple, tolerates rough industrial air, sustains 140 to 180 dB output without auxiliary power, and the only routine wear part — the diaphragm — is field-replaceable in under an hour. Titanium diaphragms typically last three to five years under normal duty before output drift signals a replacement.

## Diaphragm horn vs piston-whistle horn

[Piston-whistle horns](/glossary/piston-whistle-horn) use a moving piston-and-whistle assembly rather than a flexing diaphragm. They tend to operate at higher frequencies and shorter dwell times, suit fine dust loads in [fabric filters](/glossary/fabric-filter), and have a different wear profile. Diaphragm horns dominate the 60–250 Hz band; piston-whistle and related designs are more common above 250 Hz.

## Related terms

- [Sonic horn](/glossary/sonic-horn)
- [Bell horn](/glossary/bell-horn)
- [Piston-whistle horn](/glossary/piston-whistle-horn)
- [Titanium diaphragm](/glossary/titanium-diaphragm)