Subsonic

Subsonic may refer to:

• Any speed lower than the speed of sound within a sound-propagating medium
• Subsonic aircraft, a flying machine that flies at air speeds lower than the speed of sound
• Subsonic ammunition, a type of bullet designed to avoid creating a loud shockwave when fired
• Subsonic flight, an aircraft flight at air speeds lower than the speed of sound in air
• Subsonic and transonic wind tunnels

• Subsonic (album), a 2002 album by Vigleik Storaas Trio
• Subsonic (EP), a 2013 EP by Younha
• Subsonic album series:
• , a 1995 album by Bill Laswell and Nicholas Bullen
• , a 1995 album by Andy Hawkins and Justin Broadrick
• Subsonic Music Festival, an annual electronic music festival in Monkerai, Australia

• Infrasound, sound at frequencies below the normal threshold of human hearing