Hi John, i used to make some of "poor-man's acoustis treatment". First to tell you, instead jumping into the "project", analyse the problem. If, in fact it is the "problem". Look around, and use your furniture, rugs...pilows placed into the corners, bookshelf behind the music source...heavy curtains etc...! One of the simple and not so attractive was tower made of cardboard tube (like for blue print, posters etc), drill holes about every inch troughout the tube, stuff it "tightly" with "fiber-glass" and wrap it with 4" thick sponge (for packing, as you saw "pyramid" type)using clear sealant glue (other will burn foam) You can "stick" that on stripped lamp shade stand(look trough Thrift stores or salvation army). Other "absorber" that is placed on the wall behind listener is made: Make a rectangular frame from 2x2 or 3x2 depending on how much "absortion" is req. Cut "sheetrock" to size of the frame, to cover front and back. Nail back piece to the frame, front piece drill holes (just like Tower)every inch or less ( better) stuff the frame with Fiberglass and nail or screwe the front piece. And hang it on the wall like a picture. Diffuser are also easy to make. Decide on the size of the diffusor, cut 3/4 mdf buy about as many you need to cover the board, 8 footer 2x2 cut it into the small,square but different pieces, glue to the board into the pattern (if you can find photo of the proffesionaly made board) and so on. The best is to look into "Guide for high end audio..." by Robert Harley, you'll find some of the same as i told you about, also the correct placement Good Luck!
