The DC to 20 Hertz Experience

Posted on Jan 13, 2007 12:05 am
Herb Utsmelz
Ne'er ate 'er
Member Since: Apr 05, 2006

If you love infrasonic frequencies, and want to dedicate your attic or basement to the dream, you should check this out.

www.rotarywoofer.com/

Here's a YouTube clip of it -

I have an extra bedroom, but...

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Noize2u
Czar of Midi
Administrator
Since: Apr 04, 2002

Jan 13, 2007 01:55 am

OK, that is a little outa my price range. I wanna see one work before I believe it. The theory is good but I'm not sure that little sucker is big enough to generate that kind of audio output.

Herb Utsmelz
Ne'er ate 'er
Member
Since: Apr 05, 2006

Jan 13, 2007 02:59 am

The thing is driven by what looks like a 1/2 horsepower motor, constantly running at 800 RPM, that drives a fan. The motor is cued by input from an audio signal, which alters the pitch of the fan blades to change the frequency of the infrasonic wave. Quite fascinating.

It seems you have to have a dedicated room next to your main listening area that acts as a type of resonant sound chamber, and cut a sizeable hole in it for the fan to work its magic. It's a novel idea for sure, but after a while, 5 hertz would become tiresome, and possibly cure your constipation!

On the topic, did you see the Mythbusters episode where they made a super-subwoofer connected to a car's drive shaft? I never laughed so hard.

Noize2u
Czar of Midi
Administrator
Since: Apr 04, 2002

Jan 13, 2007 05:42 pm

Hue, I did see that one, several time actually. I as well as the boyz laughed our collective butts off. but they did generate a killer sound wave which is what they were after. I think if they had actually invested a bit more time in the speaker itself and built it slightly more durable and sealed that sun roof up they surely would have blown the windows or at least one out. And they guy running the test equipment did state he had never seen anything generate that many dB's at that frequency before, so they did accomplish something.

But ya, I agree on the low frequency thing for sure. I know with the 15's in the large speaker's in here I can generate some pretty low tonege with the synths and they will reproduce it very well. But I definitely cannot sit in it for long.