holes prevent sound transmission

[Bigun]

I wonder if this has some applications to speaker design ?


Holes prevent sound from passing through plate - physicsworld.com

[Moondog55]

I hazard a guess that they used ultrasonic test tones for a reason, and that the implications don't pass on to audible wave lengths, they seemed to be saying that the hole size and spacing was most effective at the wavelengths used as test tones, with 20 metre bass wave lengths I don't think the implications are practical

[aptquark]

hmmm....so if I drilled holes in my head, the voices may go away? BRB....

[system7]

I really have NO IDEA what this is about, but it somehow reminds me of the LEAK 2030 and 2060 midrange speakers that had holes drilled in the drivers.

The mid-range unit results from considerable holographic study and again uses an unconventional diaphragm structure. The pressed metal frame carries a 3-inch diameter magnet system, and the diaphragm is exponential in cross-section. It is made from a specially selected plastic material carrying four radial groups of perforations which reduce radial travelling waves. The rear side of the cone is laminated with a transparent plastic which seals the perforations. This results in a comparable piston action to the bass unit, and gives a particularly smooth mid-range response. A problem with high power speakers is the limitation in temperature rise of the individual drive units which can result in damage to the speech coils. In the new Leak design great care has been taken to incorporate good heat radiation through the large magnet systems and the use of high temperature adhesives.

VINTAGE Accessoires

A bit like Planet10's beloved ENABL dots maybe. But frankly, don't ask me to wrap this one up with some stunning new theory of sound.