[Wayne A. Pflughaupt]

Great info, Ethan. That’s exactly what my quick-and-dirty “carpet-and-RTA” experiment was showing, that absorption reduced the lower the frequency went.
However...

The reason this matters in a listening room is because uniform absorption versus frequency is needed to maintain a uniform response versus frequency.

...just how much 703 treatment does a room need to accomplish this? If it’s as many square ft. as the carpet on the floor, that’s an awful lot of wall treatment!

Regards,
Wayne