For absorbing bass or mid standing waves while being able to radiate what passes through it due to low sound insulation from its small thickness?
There must also be bass sound transmitted from the drive unit rim and then radiated by the other surfaces ie sides of enclosure. Could this be a good thing as large radiating surfaces efficiently radiate bass?, see Pleiades Auratone 5C type cube speakers.
Asphalt spray, could it be used on possible carton paper speaker boxes? (at your risk) but it smells a lot while drying, health issues etc etc:
https://www.bonavolta.ch/hobby/en/audio/lo_damp.htm
See also:
http://www.troelsgravesen.dk/cabinet-damping.htm
The Pleiades approach seems to be the opposite of conventional. Ie let the sides vibrate and and transmit the sound so that ugly standing waves are not created in the first place. Or treat box sides as a tiny small recording studio. Ie thin membrane materials to absorb low, mid frequencies etc.
Just a baffle can sound great as there are no standing waves. The speaker sould be mounted of centre for other superposition reasons.
Baffles low cut at only 6dB per octave just like Pleiades L (inductor only) microphone filters. Closed box at 12dB/oct?. Bass reflex enclosures at 24db/oct?
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