Very sceptical that a 3kW speaker can cause "earthquake like vibrations with a radius of 2km".

MarkusWandel 10 minutes ago | parent | next [-]

Resonance! Very minor earthquakes can knock picutures off the walls, items off the shelves etc. if they just happen to hit the right resonant frequency. So if you flood the area with 8Hz-ish acoustic energy, some stuff will start to shake.

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EvanAnderson 10 hours ago | parent | prev [-]

I can't help but think it would be fun to try to verify the claim, though.

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ssl-3 9 hours ago | parent | next [-]

Fun? Sure. It is indeed fun to play with big speakers.

Direct-radiating bass reproduction is all about displacement, and the area of the piston (cone) is certainly a factor of that. More tends to be... well, more.

And this mysterious speaker (which there seems to be no color photos of, despite the 1981 date) has a radiating area of perhaps about 2 square meters.

That's around the same as qty. 18 of 18" woofers.

It's easy to find collections of way, way more than that. People even charge money to hear them; they're on the ground between the stage and the crowd barrier at any big rock show. :)

	▲	kalleboo 8 hours ago \| parent [-]
		The japanese version of the article linked in another comment has a color photo (which appears to be a magazine scan) https://audio-heritage.jp/DIATONE/diatonesp/d-160(1).jpg

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qingcharles 9 hours ago | parent | prev [-]

Marty McFly is volunteering to test it.

	▲	8 hours ago \| parent [-]
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