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Old 29th October 2008, 09:38 PM   #1
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Default Resonances transformed to thermal energy??

I came across this in http://www.coincidentspeaker.com/speakers.htm

- Enclosure Tuning: All Coincident enclosures are tuned to a very high fundamental resonance frequency of 350 hz, (as opposed to the 80 hz resonance of most speakers). This high frequency tuning technique renders resonances sonically benign and inaudible. Resonances are effectively dissipated out the enclosure and transformed to thermal energy. The end result is an enclosure with no audible colorations.

Can anyone explain to me how this works?
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Old 30th October 2008, 01:37 AM   #2
CLS is offline CLS  Taiwan
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For the link above, it's NOT what we normally call "cabinet tuning".

Dividing the areas of a cabinet's wall would raise the rigidity and the local resonant frequency of each divided area would be raised.

And, most of the damping (sound absorbing) materials work much better at higher frequecies.

So they can work together and yield a much better result.

Reference: B&W Matrix.
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Old 30th October 2008, 01:39 AM   #3
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Well, damping generally converts kinetic energy into thermal energy. Aside from that, it's probably just ad-speak since cabinets have multiple resonances, not just one.
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Old 30th October 2008, 02:04 AM   #4
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At 350Hz, a quarter wavelength is about 25cm (or 10"). They've probably got bracing in the cabinets every 25cm...

And, in all speakers in boxes, the energy from the air being moved by the back wave of the driver has to go somewhere. In a ported box, some of it exit via the port. Some (in both types) comes out through the driver (). And some causes the panels in the box to resonate. If the boxes were made of Sorbothane (or other such material) then almost all this energy would dissipate as heat, but as MDF, ply and particle board are more rigid, some of this is released from the back of the box as air-movement (which can affect the sound of the speaker - depending on opinion :O).

IMO, ad-speak. Still, it's a cut above the usual...
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Old 30th October 2008, 12:37 PM   #5
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Thanks guys,

it makes sense now...
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Old 1st November 2008, 12:06 AM   #6
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That's a pretty stiff cabinet at 350 Hz alright, though I'm not sure how sonically benign that makes it.
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