sound-proofing

aircraft sound proofing

heat insulation-sound proofing

sound ranging (artillery sound ranging)

drown proofing Navy SEALs

corrosion proofing

fire(-proofing) test

rust-proofing

proofing

clicking sound

communications by sound

high-intensity sound

sonar (sound navigation and ranging)

sound communication

sound wave

sound-absorbent tile

stun grenade / flash grenade / flashbang / thunderflash / sound bomb

artillery sound reconnaissance

supersonic speed (exceeds speed of sound / Mach 1)

sound damping

aerial sound ranging

air registration point (in sound ranging)

high-frequency sound waves

sound-proof compartment

background sound pressure level

overall sound pressure level

adjusted slope of sound pressure level

atmospheric sound absorption

change in slope of sound pressure level

slope of sound pressure level

average slope of sound pressure level

final background sound pressure level

local speed of sound