Dan Lyke on Nostr: I don't know if it's useful to you, but I slapped a couple of these together in my ...

I don't know if it's useful to you, but I slapped a couple of these together in my shop. The additional filter surface are of the Corsi-Rosenthal layout would be nice, but small house...

Maybe someone near you has some 1/4" (or even 1/8") ply and the ability to cut it?