Online Acoustics on X: "Tuned bass trap with limp membrane. Theoretical frequency was 79 Hz , measured value was 76 Hz :-) The Q value is quite high so it absorbs around
Bass Trap a Membrana Intonata Scopus (T100) - GIK ACOUSTICS ITALY
Diaphragmatic versus membrane bass traps | What's Best Audio and Video Forum. The Best High End Audio Forum on the planet!
Primacoustic MaxTrap 24"x48"x19" Corner Mount Broadband Bass Traps | AV Australia Online
Building some diaphragmatic absorbers - Advice wanted | Room Acoustics, Construction and Design