Edgar Villchur is the man who invented sealed speaker enclosures using the acoustic suspension method. AR brought their first sealed speaker to market in 1956 so this is a very old technology. The ironic thing is the acoustic suspension speaker was designed as a way to get deeper bass from a smaller enclosure compared to ported speakers. Now we have giant sealed enclosures.
But sill much smaller than in the 50s, when the acoustic suspension was developed. But first and foremost, suspension provided an elegant solution to the age-old problem of bass distortion in loudspeakers caused by non-linear, mechanical suspensions in conventional loudspeakers.
Acoustic Research - Wikipedia, the free encyclopedia