http://www.eminent-tech.com/main.html
Click on TRW-17 pic. Looks like a fan. Then "output comparison".
Dave
Click on TRW-17 pic. Looks like a fan. Then "output comparison".
Dave
Why is good, deep bass so difficult? - Myths and their Busters
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http://www.eminent-tech.com/main.html Click on TRW-17 pic. Looks like a fan. Then "output comparison". Dave |
@kost_amojan. Well it should be easy for you to show me a link to a Stereophile or other measurement plot of a JM Labs high end speaker that does not have a bass boost, bass bump or hump? You should be looking for a flat response that gently rolls off in the bass with no increase in response below 120 Hz at all. I feel sure you can find this as you are extremely confident. |
I have seen a couple of takes on the fan as a woofer idea. Just FYI, as Dr. Leach was fond of saying, 0 Hz isn’t a sound, it is wind. Another was kind of a corkscrew in a tube. Seems to be long disontinued, the Phoenix Gold Cyclone by BNIB. Another way to use a rotating motor is converting the rotation to linear travel with a flapper, like the Devialet. Neither method really resolves room mode issues and trades motor strength for effective surface area. As a signal drops an octave, displacement must increase by a factor of 10 for any given driver, so 1mm at 40 Hz becomes 10mm at 20 Hz, and so on. Fans, assuming they can spin fast enough, eliminate the excursion issue. No idea about distortion figures. I can say that with a Hsu VTF 15 I can get monstrous output in room at 16 Hz, so not really a problem I need to solve. |
Did a little searching on data-Bass.com At least on paper, the rotary woofers don't seem to do all that great compared to far less expensive solutions. Seem to be just as output and distortion limited as their coned counterparts, or at least close enough to make the $12k price tag questionable. Best, E |