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High Efficiency Speaker Asylum Need speakers that can rock with just one watt? You found da place. |
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High Efficiency Speaker Asylum Need speakers that can rock with just one watt? You found da place. |
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In Reply to: Re: Olsen posted by JLH on July 29, 2003 at 19:32:07:
and I've done what I've done. He based his written works on the results of the cabinets he built, as have I. As to the car analogy, maybe not on earth, but a ten HP engine would be enough to accelerate a vehicle to quite a few thousand miles per hour in space, where neither the constraints of friction or gravity would have to be overcome. Point being: For every rule there is always an exception.A driver does have a finite motor strength. But excursion, and the force required to get it, of a cone drops by a factor of four as frequency doubles. Drivers eventually 'run out of steam' at high frequencies as the impedance rises and as the mass of the cone becomes too great to sustain high frequency response. But there are ways around everything. See: Whizzer Cone.
The Klipsch 'rubber throat' was his discovery that reducing the area of a throat plate enhanced low frequency response by turning the volume between the cone and the throat plate into a tuned chamber that acted as a low pass filter. It also can improve high-frequency loading. I use both of those factors in my horns.
On the directivity issue, my latest mid-bass horn measures down 4dB at 45 degrees off axis at 1.6 kHz, which for a ten inch driver isn't half bad in a baffle. I'll certainly take it in a horn, folded or straight. Does 'mass rolloff' exist? Undoubtably. Is its frequency derived from the formula 2Fs/Qes? Absolutely not, at least not to the extent that it affects the performance and usefulness of a horn as much as many designers believe it to. While it's true that the total power may be falling, as long as you're getting no more than 6dB deviation between on-axis and 45 degrees off-axis response then the frequency range is considered at least usable, and in many cases pretty damn good.
Re-writing the book on Physics is a continuous process. When I went to high-school, sometime not long after the Dark Ages, our physics texts told us that the smallest particle was the electron. Now we're looking for Dark Matter? Not long before that it was held that travel beyond the speed of sound was not possible. Mr.Yeager put an end to that myth in fine fashion. Today travel at light speed seems impossible, but maybe only because Zephraim Cochrane hasn't been born yet. Newton and Einstein still don't know which of them was right, and in the end the answer may be neither.
Not so many years ago a group of NASA scientists undertook a detailed analysis of the common Honey Bee. After months of work, thousands of calculations on the Cray, and more than a few dollars expended, they decried that according to the Laws of Aerodynamics and Physics it was simply impossible for a Honey Bee to fly. Somehow the Honey Bees never got the message. However, a strange phenomenon occurred. Not long after NASA published the results of their study, entymologists around Cape Canaveral noted an unusual rise in the incidence of NASA employees being stung on the ass by Honey Bees flying past.
I don't care for being stung on the ass so much, so rather than be bound by the Laws of Physics I'd far prefer to rewrite them.
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Follow Ups
- Olsen did what he did - Bill Fitzmaurice 07/30/0313:34:26 07/30/03 (2)
- Re: Olson, Newton, Einstein and physics (long ramble). - Paul Eizik 21:55:43 07/30/03 (1)
- Hey Paul - Bill Fitzmaurice 05:41:04 07/31/03 (0)
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