A common illustration of sympathetic vibration is to sound a tuning fork and bring it close to, but not touching, another fork of the same frequency, which will then begin to vibrate sympathetically.

Compare: Absorption, Amplification, Incidence, Reflection, Resonance, Resonator, Simple Sound Source, Sound Pressure, Sympathetic Vibration, Transmission. The flared horn of a trumpet or a loudspeaker ...