Sound that propagates in the medium in the form of compression and rarefaction.

A wave in which particles of the medium move in a direction perpendicular to the direction that the wave moves.

sometimes referred to as pitch, is the number of times per second that a sound pressure wave repeats itself.

Given a distance of 500 meters and time recorded of 2 seconds, compute the Speed/Velocity of sound.

______________ of a sound is the distance between adjacent identical parts of a wave.

device that measures how well a person can hear certain sounds.

The inverse square law can predict the Frequency at a given distance from the sound source.

The power or energy of a soundwave

the amount of sound energy absorbed by the acoustic material, when sound wave incident upon it. It is a measure of how much sound is absorbed by a material or object.

An effective absorber will have a sound absorption coefficient greater than _______ , so more than 3/4 of the arriving sound is absorbed or transmitted, taken out of the room.

the standard rating for how well a material absorbs sound.

the loss of sound energy when sound waves comes into contact with an absorbent material such as ceilings, walls, floors and other objects, as a result of which, the sound is not reflected back into the space.

the term we use to refer to the absorption and diffusion technology that is applied to treat the energy within our room. We need to manage all surface wall, floor, and ceiling reflections.

low-frequency sounds stand for sound waves with a frequency below the lower limit of audibility (which is generally at about 20 Hz). Low-frequency sounds are all sounds measured at about 500 Hz and under.

a tuned absorber technology that has a tuned port or slot in its top.

the most powerful of the three low-frequency absorbers. It has a front wall or diaphragm that has a calculated mass or density.

the measure of the amount of energy removed from the sound wave as the wave passes through a given thickness of material.

consist of an acoustical oscillation system, where there is a solid plate on the front end with tight air space behind it.

Best Use: For improving the sound in small to medium rooms, like recording studios, control boardrooms, and even small home theaters.

Best use: For restaurants, offices, cafeterias or any spaces that handles mass load of people.

create natural or artificial harmonics of a sound source to shine through and can give the sound additional warmth and stereoscopic space.

a sound that is repeated because of sound waves being reflected back.

Also known as visual axis or line of sight is an imaginary line between an observer/spectator's eye and a subject of interest

a method for analyzing whether or not reflected sounds would cause annoying echoes. If the sound path of the reflected sound is more than 34' longer than the direct sound path.

the return of a sound wave from a surface.

a common problem with audio conferencing systems. It originates in the local audio loop-back that occurs when your microphone picks up audio signals from your the speaker.

In larger Halls, less absorption is needed.

Strong late sound reflections and reverberations may produce __________ .

In Auditorium sloping floors should be not lessthan _______ .