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You can't just fart around with simple designs and cheapo materials because each of those will drastically affect the performance of the diffusor.
Get a couple of these:They are designed with an asymmetry that breaks up soundwaves very efficiently. The carpeting on it prevents defraction and rarefaction. Couple warnings, they are ugly and heavy. Also if you own a cat, for some damn reason they refuse to stay away from them! Drives me nut, but I use one in my system it seems to do the trick.
Indoor plants in front of or on the back wall. -Roy
Can't see how that is going to really do anything, but would love to hear from the experts.
Want something cheap? Bend a piece of plywood, put a brace under the center of it and tack the 2 edges to the wall, forming a shape similar to a poly. Fill the rear with insulation to stop it from ringing and to provide a slight amount of lower end control. Frequencies absorbed - pure guess. Variables include width, depth, and thickness/density of the plywood. Shallower spaces and thinner wood move frequency up. Deeper space and thicker lowers frequency but at the expense of efficiency per square foot in terms of absorption.Bryan
What ya think?
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