can you remind me, what is the deepest well you did?
It seems that prd's have the wool on qrds, 2d scattering etc. Been playing with the calculator a little lately...the BIG one we posited for the fireplace if you recall...(and ever mindful of my 'swings and roundabouts' theory in engineering) it seems to me the big disadvantage of prds is the depth needed for a given frequency. Compared to qrds these seem to get very deep quickly to get low.
I'm sure you have realised that as well.
I guess that is a lot of the reason attempts are made to make them out of styrofoam etc.
After having done that many, how much fine tuning did you need to do with your cutting jig, or did it get smoother/quicker at the end due to operator improvements?
Basically, what changes did you make to your procedure (if any) after familiarity, what changes would you make for any next round you may have in mind?
Well done, that is an awful lot of surface area!
Have you worked out how to measure any changes in your room? Where would you see those changes? (always hear about the 'reverbarent tail' or whatever, so what measurements would be best to see the changes)