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Before you can apply acoustic treatment to the room, you have to select the place in the room that will be your main listening area first. It's important to note that the best acoustic performance will almost always come from setting up lengthwise in the room, because it's easier to avoid some of the problem room modes. In other words, the speakers should be firing the long way down the room. As you've seen in previous videos, every room suffers from reflections that reinforce at the 50% point of the room. These then diminish at the 25% and 75% points.
This means that if your listening position is placed exactly half way in the room, there will probably be at least one frequency that will be extremely loud, but it might be nonexistent at the 25 and 75% points. This can happen even when the room is acoustically treated. As a result, you want to place both the speakers and listening position and listening position somewhere between the 25, 50, and 75% positions of the room. Ideally, you'd want a point that's an odd, non-divisible number like 27, 38, or 45%.
That said, many acoustic designers feel that the 38% point is the ideal listening place in the room. If you can't place your listening position at that ideal point, just strive to place it somewhere other than at the 50% point. Keep in mind that after you've finished treating your room, you might want to experiment with slightly different speaker placement, since only an inch or two can sometimes make a big difference in the sound.
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