For diffusors to have adequate bandwidth reaching into the lower midrange and upper bass, the wells need to have far more depth than a couple of inches. It’s the “quarter wavelength” rule - bandwidth equivalent to ~4x the well depth. In my system, I’ve allocated 18 inches to the depth on my front wall for the installation of P17 quadratic diffusors. The entire front wall assembly, including the four diaphragmatic bass absorbers columns and supporting steel frame lifting the modules 13” above the ground for AC duplex outlet clearance, weigh 800+ kgs.
9 Likes