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Rear Walls..and things

203.37.199.15

Posted by Gary Jacobson on August 24, 2002 at 17:51:12

In Reply to: Duke, one more question, if I may... posted by patrick S on August 24, 2002 at 12:44:06:

G'Day Patrick and All,

OK, 1.5 metres (about 5 feet) of the rear wall is good, but not mandatory. If you want ot get into some kind of combined diffusion/absorption then go no further than Jon Risch's DIY tube traps and absorption panels.

For single Quads, if it is "allowed" (so to speak) start with a couple of DIY tube traps in the corners "behind" the Quads. This almost always improves the depth of sound stage by cleaning up some low frequency room modes which love to "accumulate" in the corners. These should be only about 3 feet high. Jon specifies fibre glas which I have replaced comletely with polyester roof insulation batts and obtained excelelnt results. Jon recommends covering the surface with very low density quilt "batting" (polyester) so that high frequencies are absorbed and diffused. If you need a little more reflection for purposes of diffusion then you can wrap light plastic film on one side of the tube trap.

Small absorption panels as wide as the speaker and about 3 to 4 feet high and 4 to 6 inches off the wall would be of great help too. These need only be about 6 inches thick for single Quads, adn can be made to Jon's recipe with all polyester and finished off with light quilt "batting" also. Pace such panels so that they act "like a mirror" and would receive incident sound from the treble panel and "bounce" it into the adjacent wal at a shallow angle. They should never be parrallel to the rear of the speaker. It is a matter of adjusting the room performance by ear.

Perhaps, if further absorption/diffusion is required for mainly vertical modes of resonance then you could also consider Jon's DIY Room Lens which works well in association with these other devices.

Hoep this is of some assistance.

Regards,
Gary Jacobson

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