LOL! Reminds me of when I was a kid building speakers out of my shoe boxes. I would take speakers out of different electronics and "mount" them into cardboard shoe boxes. I remember showing my friends how much better speakers sounded inside a box vs. outside it.
cardboard has almost no effect - it's almost like hanging drivers in the open air.
the thinnest cabinet that has SOME sort of effect is found in JBL EON 1500 speakers. it flexes SO MUCH in operation ( if you put hand on the side of it ) that it is somewhat surprising that it produces ANY bass. but it does.
perhaps it produces only 1/2 as much bass as a proper cabinet would have produced but then it also weighs half as much as a proper speaker so it's a fair trade off considering it still produces all of the mids and heighs and you can always add a subwoofer to it.
that JBL cabinet is about 3 millimeter thick polypropylene. it consists of two parts which are simply screwed together with a foam gasket - no glue ! now that speaker truly is the most budget speaker that actually works - it still runs $400 though.
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