Air Columns And Toneholes- Principles For Wind Instrument Design Jun 2026

Opening a tonehole provides an escape route for sound pressure, effectively "shortening" the column of air. The first open hole acts as the new end of the instrument, raising the pitch.

A woodwind is effectively a sequence of acoustic sections separated by toneholes. When closed, a tonehole is acoustically invisible (if perfectly sealed). When open, it presents two effects: Opening a tonehole provides an escape route for

A series of open toneholes acts as a high-pass filter. Above a specific "cutoff frequency," sound waves "ignore" the holes and travel to the end of the instrument, affecting the instrument's brilliance and projection. Effective Height: Opening a tonehole provides an escape route for