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Sounds Of Science - SOFSCI - Speaker positioning

Sounds Of Science - SOFSCI - Speaker positioning

Speaker Positioning

 

Another very important part is Speaker Positioning and here is a very good model, created by George Cardas (kudos!) who is a math wizz and generally very clever. The best listening rooms are rectangular and this is the way how to position your speakers in such a room:
 
Active nodes are the main concern when placing speakers in a rectangular room. A node, or the frequency where speakers and parallel walls interact, is proportional to the speaker to the wall distance.
The three most importance nodes, in order of importance, are proportional to the distance between the speaker and:
1. The side wall nearest the speakers
2. The rear wall
3. The side wall across from the speakers
 
The (clickable) Image to the left shows calculated positions as follows:
1. The distance from the center of the woofer face to the side walls is: Room Width times .276 (RW x .276).
2. The distance from the center of the woofer face to the wall behind the speaker is: Room Width times .447 (RW x .447).
 
This is all you need to know to place speakers in a symmetrical, rectangular room.
 
The importance of symmetrical speaker placement in a small room cannot be over emphasized. Once the speakers are set as close to perfect as possible, you must angle them slightly toward the listening position. This can be done by ear and usually a 1/4 to 1/2 inch tweak will do. Box speakers generally require a bit more toe-in than planear speakers. You will be able to hear a center focused voice clarify when the sweet spot is hit.
In the near field position the speakers and the listener's head are the points of an equilateral triangle. Near field listening gives the perfect stereo field. It is frequently used in the recording studio to position the microphones andthe voice in the mix.
The near field listening position is determined by the "center to center" distance of the speakers and the distance to the listener's head. It does not refer to the room in any way. Basically your head should be at the "top" of the triangle but some people (including ourselves) find it better to sit just behind it, hence the placement of the sofa in the picture.
 

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