this is the membrane that reflects high frequency sound waves while allowing the lows to pass through and be absorbed. i used 3mm gardening plastic + the heavy plastic the fiberglass came packaged in. the point of reflecting the HF waves is to keep the room sounding live and while still sopping up and absorbing all the deep or muddy lows, which additionally the membrane helps to absorb to a lower FQ then without the membrane(down to 35mhz!). this is mostly effective in corners where the air pocket behind the trap is maximized, therefore not nearly as effective on a flat mounted panel with minimal or no air pocket.

the muslin underneath it is glue on using a can of spray adhesive. any brand works as i tried them all as they came up in sales. theu muslin went on much like wrapping a gift.

and this is a finshed low FQ reflective basstrap, corner mounted for maximum effect
[img]http://i30.photobucket.com/albums/c326/westfaliamama/IMG_3261.jpg?t=1256978381[/img]

[img]http://i30.photobucket.com/albums/c326/westfaliamama/IMG_3262.jpg?t=1256978400[/img]