Ethan's membrane traps: using plasterboard instead of ply?

[Bremen Nacht]

hi

I need to cure a peak at 68Hz (easy to see where it's coming from, parallel brick walls behind speakers and behind listening position 5m apart). Ethan's membrane traps seem a sensible place to start, but the LF trap he describes using 0.25 inch plywood apparently only works down to 80Hz.

Would I be right in thinking that a heavier material for the membrane (plasterboard) would reduce the band of frequencies over which it resonates?

thanks

[Ethan Winer]

Bremen,

> Would I be right in thinking that a heavier material for the membrane (plasterboard) would reduce the band of frequencies over which it resonates? <

Yes, but I don't know if plasterboard is the best naterial for that. I'd use 3/8 inch plywood.

--Ethan