a delay line based on the time of propagation of sound waves

a device for amplifying or transmitting sound

an antique record player; the sound of the vibrating needle is amplified acoustically

sound is not amplified by electrical means

sound is not amplified by electrical means

opposition to the flow of sound through a surface; acoustic resistance is the real component of acoustic impedance and acoustic reactance is the imaginary component

opposition to the flow of sound through a surface; acoustic resistance is the real component of acoustic impedance and acoustic reactance is the imaginary component

a modem that converts electrical signals to telephone tones and back again

a modem that converts electrical signals to telephone tones and back again

a modem that converts electrical signals to telephone tones and back again