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I'm going to simplify here

Posted by bartc (A) on May 30, 2005 at 07:53:53

In Reply to: Room lense placement posted by Dan_ed on May 30, 2005 at 06:51:31:

Room lenses work on the synergy of 4 acoustical functions, but primarily they are used to "break up" or "slow down" the wavefronts of REFLECTED sound. So they need to be in the path of a reflection between the speaker (front, back or side) and a wall or a wall reflection point and your ears.

The "typical" placement guides I find to be a bit misleading. Here's where to start instead:
1) figure out where the main wall reflection points are in your room from ALL the 4 walls
2) figure out which are the "first" reflection points, the very first wall closest to your speakers
3) start with the lenses between the speaker and the wall of that first reflection point and the third lens between then about the same distance from that same wall (but if your first reflection points are side walls, then behind the speaker plane and parallel to the wall behind them)
4) have a friend move them around that space - forward and back, side to side, then toed in or out - in small increments while you listen
5) then for an experiment try doing that with the other reflection points, including the wall behind you if you have the room
This method will help you hear/visualize all the options (and you can build more lenses if you like more than one effect)

Remember that the first reflection point will be your side walls IF and only if your room is a rectangle and your ear to speaker axis is along the long dimension. Otherwise, it's in the wall behind your speakers usually. Occasionally with speakers placed nearfield and far away from that wall, it can be on the wall behind you, but this isn't true in most rooms and setups that I've seen.

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