The School of composing

Each song should contain a recurring theme and should not be boring. It's two most important features

We make a listening room to our needs, part 5

A standing wave is the wave of the same length as the length between the side walls

of the listening room.


The standing wave

In a classic room in the shape of a rectangle, distance between the side walls is the same throughout the room, when in this room we listen to the music then the frequency of the standing wave is amplified by the fact that the reflected wave begins to enters into resonance and in this way is enhancing its original power. When the wave of start the overlap and the resonance on this distance, then this frequency is emphasized in this room.


In this case, correctly recorded the song we'll hear a song that has overstated some frequency. If we listen to the same recording in a different room, with other dimensions, enhanced will be a different frequency. This unfavorable phenomenon occurs when the room is with the same distance between the side walls.


How to solve this problem ?

The process is fairly trivial, you need to on the side wall, behind the sound engineer put the screen reflective acoustic wave. The screen positioned so that the reflected wave is toward the back of the room. This means that the screen is not parallel to the walls, but at some angle. On the other wall we put the same screen, opposite the first screen. 

 screens 11

the acoustically symmetrical setting in the room 

Remember that all screens and other elements must be placed symmetrically on both walls of the room. This means that the room must be acoustically symmetrical. If you have on the side of the room the door, you should place the screen on the door and also set the same screen , positioned in the right way, opposite the door. 


Why is this important ? 

Part of reflected wave returns to the listener. There is no perfect listening room. If the room is not balanced for the acoustic wave may result in a stronger listening one of the channels. So the signal panorama will be disrupted. So the listener, despite correctly recorded music, he will be able to hear for example: As the left channel louder than the right channel. The room should not have a cuboid with equal sides, since the standing wave is the greatest. Ideally, the room has sloping walls.

If we have a room in the shape of a rectangular, width and the length of the room should be in relation to height for ratio - 1.14 and 1.35. In this room the distribution of the standing wave for the frequency band is fairly evenly.


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