The first thing that an Acoustic engineer would need to think about is the length,width and height of the room.This is important because this will give you the volume of the room. The recommended reverberation time is 0.5 in a room. A balanced frequency has good sound distribution also the acoustic engineer will have to try and keep inside and outside sounds out. you have to have a controlled amount of reverberation because if there is to much reverb it causes the coherence to reduce  and not enough sounds are “dead” like an anechoic chamber.

DIRECT SOUND- the sound travels straight to you.

EARLY REFLECTION-  early reflections give your brain the information about the size of a room, and for the sense of distance of sounds in a room.

LATE  REFLECTIONS- means when the sound travels around the room before you hear it in your ear and is slightly more delayed than early reflection.

Room symmetry- Is important because if your speakers are not symmetrical they will have a different frequency response so that why it is important to place the speakers near the shorter wall as this puts you further away from the rear wall where the peaks and nulls are most sever. speaker height and possible angle of loud speakers towards the listener should not be placed closer than 1.2m from the floor

 Diffusers- are used to eliminate and repetitive echoes that would occur in rooms having parallel walls and a flat ceiling.Used to prevent sound from bouncing repeatedly between the same two walls.

 Porous absorbers- soak up sound are usually used for midrange and high frequency  absorption. The thicker the material the more effective it is  absorbing lower  frequencies. Heat is generated by mechanical movement of the fibres and by friction as the air molecules move forward and backward inside.