Sam, Thanks for the help...it sounds like I need to make sure I have enough room on the sides for the damping material. Could you recomment anything other than fiberglass (like bubble pack?). Do I increase the volume of the enclousure by the volume of the fiberglass/bubblepack or is it transparent to sound? I will use the same volume as Wayne suggest for the Thermionics Three Pi reflex which is about 4 cubic feet.