This makes me think of the $5 mil speaker made of gold. While the aluminum or carbon fiber do a great job of managing resonances HSU research did it with s $25 piece of sonotube.
$172,000 pair Magico m6 Speakers Overview
The four solid aluminum blanks used to make the exterior surfaces are specially machined to produce curved surfaces without corners. A thick internal aluminum baffle holds the drivers securely, while 10 special rods tighten the front and rear panels, further increasing the rigidity of the structure.
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