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Speaker Asylum General speaker questions for audio and home theater. |
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Speaker Asylum General speaker questions for audio and home theater. |
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In Reply to: Getting minimum acoustic sense into this mishmash of false dogma... posted by Thorsten on July 14, 2012 at 08:15:57:
There was no "pro division" and "consumer" or "home" division of JBL in the 50's. Lansing's focus and experience was with large spaces such as theaters and broadcast production facilities. The mix/match brochure which in some instances utilized the bullet tweeter contains speakers that were "functionally designed for professional and 'built - in' use" as well as speakers that appeared to be designed as home furniture. Because Lansing decided to use some of the same drivers in cabinets that could be put in a home does not mean the drivers were originally designed for that purpose. The acoustical interactions between loudspeakers and different spaces were not known at that time anywhere near like they are today. And opportunistic business decisions drove marketing - not always correct science or engineering.
Also, a speaker that exhibits constant directivity doesn't preclude a slight narrowing of response with frequency. The key to constant directivity design is the uniform response lines (or essentially parallel response lines)over successively wider listening anlges at the frequencies where directivity can be controlled - from approximately 1 khz to 10 khz. As noted earlier, the Revel Ultima Salon 2 excels in this capacity as evidenced by the Stereophile test plots I linked to earlier and as suggested by figure 25 on page 14 of Toole's white paper that I linked to. Bringing up the flatness or lack thereof for a directivity index plot is a side distraction that confuses people like you.
Everything I've stated in this thread has been derived from personal experience and from the experience of other's like Toole and Olive. My experience with JBL goes back to the first set of speakers I ever owned - JBL L 19's back in grammar school in the 1970's when I first started building loudspeakers and amplifiers. There's nothing you're going to be able to tell me that I don't already know about Jim Lansing and the company he formed. My understanding and knowledge goes far beyond advertising brochures. And despite all my concerns over your ignorance and misguided assertions, I can at least give you credit for recognizing the inherent value of JBL product quality in general. Where specifics are concerned, however, you still remain completely out to lunch.
And yes, I know the difference between near field and far field and the murkiness of the subject based on the relationship to wavelength - that's why I stuck with an absolute. If the dimension of the lowest produced frequency can exist well within the distance from the source to the listening reference point - it HAS to be considered far field. I expected you'd nitpick this issue too since as evidenced by all of your posts, it's in your nature to use the sharing of information as a competitive exercise rather than a means to benefit oneself by learning from others while occasionally helping others learn from one's own experience.
"I have you here at a disadvantage of course, as I am quite familiar with such systems." - Thorsten earlier in this thread.
ugh
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Follow Ups
- ugh - villastrangiato 10:06:05 07/14/12 (2)
- RE: ugh - Thorsten 10:46:17 07/14/12 (1)
- double ugh - villastrangiato 11:48:57 07/14/12 (0)
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