TubeTrap patents by Arthur M. Noxon

At your risk. Please take all safety precautions as on all euroelectron posts. There are many patents, i think this is the one I had read, US4,548,292. Limp mass membrane absorber is also used, see also: https://www.acousticsciences.com/artblog/limp-mass-membrane-bass-traps/ i may be wrong but i get the impression that what Sean Davies had told me on using betumin roofing felt or linoleum panels are mentioned on Gilford's BBC Acoustics book may be different. Linoleum or roofing felt dissipates low frequency energy by bending itself thereby converting vibration to heat by the hysteriis loop of the material. But porous absorbers are added to these for extra damping. Art Norton discusses on his blog (above link) that the resistive (disipative) part is the porous material. But if i am not wrong the vinyl sheet on the TubeTrap may be doing heat dissipation by deflection too. How would TubeTraps absorb using linoleum, perforated linoleum? Or perhaps could Pleiades absorbers be made by twisting linoleum so that it becomes a cylinder and then let it stand on floor or hung from ceiling, linoleum wouild absorb bass by deflection, and would provide dispersion by sound waves of other frequency hit its cylindrical surface. Would porous absorber be needed inside? Hiting this material gives a well damped sound.