Sound propagation & noise control — how sound waves travel, resonate and are absorbed, transmitted and isolated.
Drive a piston in an acoustic channel and watch compressions travel while the air itself only oscillates, with wavelength, speed, SPL and a movable probe.
Cut away a rigid room and place a source and microphone along one axial mode to find pressure nodes, resonance and response amplitude.
Send sound into a porous specimen on a rigid backing and track incident, reflected and absorbed power as the absorption coefficient changes.
Compare a heavy limp wall against the same wall with a small open penetration and see how leaks set the transmission loss.
Drive two opposing speakers in a duct and tune amplitude, phase and delay to cancel a tone at a movable error microphone.
Switch off a source in an adjustable room and watch energy decay on a dB curve while Sabine RT60 responds to size and treatment.
Open a magnified condenser capsule and see sound pressure move the diaphragm, change capacitance and create a voltage.
Section a moving-coil driver and see current produce force while mass, stiffness and damping set cone motion and resonance.
Mount a rotating machine on springs and dampers and compare its motion with the force that reaches the floor.