Rotary woofer (was Re: [sdiy] Brain filling in fundamental)

[cheater cheater]

Yeah, this price is amazing.

But in true DIY spirit, I'm wondering if you could take a usual, good,
DC fan of some sort and modulate the speed with low frequency audio
signals to get similar results.

If you assume the fan is weightless and the speed change is
instantaneous, the pressure changes should be similar to what a normal
speaker would do (of course with the added advantage of a good
impedance match). Now to predict how the fan's weight distorts the
signal... second-order DE system, anyone? :)

Damian

On Mon, Jul 21, 2008 at 11:47 AM, Tom Wiltshire <tom at electricdruid.net> wrote:
>
> On 21 Jul 2008, at 11:23, Samppa Tolvanen wrote:
>
>> On Mon, Jul 21, 2008 at 1:00 PM, cheater cheater <cheater00 at gmail.com>
>> wrote:
>>>
>>> Andre,
>>> http://www.rotarywoofer.com/howitworks.htm
>>>
>>
>> LOL!
>>
>> In this Bukowski stylee, I might miss some months.. but it's April
>> already?
>
> This is indeed a quite remarkable idea! A speaker that only works up to 40Hz
> and costs $20,000!
>
> Love it, where can I buy one?!
>
> T.
>
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