Film-Tech Forum ARCHIVE: The Rotary Woofer

This is topic The Rotary Woofer in forum Film-Yak at Film-Tech Forum ARCHIVE.

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Posted by Bill Enos (Member # 440) on 08-24-2006, 06:25 PM:

A friend sent me the info on this. Another variation on the motor driven woofer, this time using flapping fan blades. To me it looks like it works, but with all the moving parts it would seem to me that it will develop mechanical noise of its own not too far in. Take a look, what do you think?
www.rotarywoofer.com

Posted by Paul Mayer (Member # 355) on 08-24-2006, 06:36 PM:

Also take a look at this thread from last year - same manufacturer, different model:

Amazing new Sub-Subwoofer

Posted by Leo Enticknap (Member # 534) on 08-25-2006, 05:19 AM:

Rotary woofer? Sounds like a dog in a washing machine.

Posted by Cameron Glendinning (Member # 3516) on 08-26-2006, 01:08 AM:

Interesting.

To a small degree this reminds me of a sonic activater, which is a motor with an unveven blade, the faster it goes the more it shakes, small ones can be added to seats, so the seats shake when low bass hits. Our ears are very inefficient at hearing low bass. we tend to feel it!
6 inch voice coiled 18" - 27" speakers are rare but are produced and can operate from -3db at 15 hz.

Didn't the military do research into developing some sort of weapon that used sub bass, I cannot remember exactly but a large dose of 7 hz makes people poo their pants? ( i am serious )

Posted by Pete Naples (Member # 761) on 08-26-2006, 04:55 AM:

Yup, ELF in that 0-5'ish Hz region is extremely bad for the nervous system. A recording engineer friend told me that once he was working with a bassist using a fuzz pedal, some of the harmonics were getting way down into this region, and both he and the musician suffered nausea and temporary paralysis!

Posted by Charles Greenlee (Member # 3856) on 08-26-2006, 12:40 PM:

Ahh yes, the all to famous brown note. [bs]

Unfortunatly the Mythbusters did a peice on it, and couldn't find it.