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In Reply to: RE: "The goal was clearly sales" -- this is a problem? posted by Brian H P on September 05, 2014 at 12:40:12
No, not at. O'Toole is to be commended for his research and statistical compiling. After all his research did make API the largest speaker company in the world in the 80's, exactly what the Canadian government wanted.
Just bothers me to see so called "audiophiles" use some of his studies out of context n probably demographics to justify their point of view ( sorry you have to follow thread on general, mixed speaker polarity, to catch up).
I have great respect.for O'Toole. But with any study.it has to be taken in context.
Follow Ups:
Many speaker manufacturers use Tooles work and the NRC facilities including PSB (which is not API), SVS, etc. There was no hidden agenda nor an agreeement between Toole and the Canadian government. This falls under the category of a conspiracy theory, nothing more.
. . . I take some of his findings very much to heart, and certainly not out of context. I aim for flat on-axis response, a smoothly tapering off-axis response, non-resonant cabinets, minimal distortion, and excellent phase tracking at least an octave either side of crossover.
This means selecting drivers with excellent specs, wide, flat response, and no nasty breakup modes outside the intended passband (metal cone woofers need not apply), so as to avoid excessive crossover complexity. Usually I can get by with a first order filter plus Zobel on the woofer, manipulated to provide adequate BSC, and second order plus L-pad on the tweeter. Both drivers connected in positive polarity. The steeper highpass filter, in addition to lowering distortion and improving power handling, adds a bit of phase lag to the tweeter to compensate for its more forward acoustic center -- even though the drivers are not "time aligned," the phase tracks nicely through the crossover region.
.......do you have to be reminded that his name is Toole, and not O'Toole?
Honestly, it's as if you only pay attention to your own posts and ignore the replies. Where's the credibility in that?
Al
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