Great info in your videos - specially for those who are in the construction phase of their studio room. For those of us using a pre-existing room, not so much. Our rooms are the dimensions we've got. And 'small' is relative, too. Your room mode demo video, for example - almost a 12' ceiling. I wish I had 12 feet in any dimension in my room. Membrane traps? Great, again, if you've got room for them. If i put as many thick traps as you show in my room, I wouldn't have room for the desk or chair to sit in!
I forgot to mention....
Membrane traps are for concrete rooms!
NOT for use in framed construction.
Same for Helmholtz, panel, perf, etc. - Go Broadband!