Maybe there's more to the design than you're aware of, Ivan. There are methods - some well-known, others we've patented
"I - the royal we, you know, the editorial.""Me... and (four) other guys..."http://www.imdb.com/title/tt0118715/quotesJon
What I mean is: Are you affiliated with Meyer? In that case it would be considered good netiquette to have your signature reflect this.
The deep horn, a well-matched amp, and some clever signal processing tricks keep the compression driver happy by controlling excursion and distortioBreakup modes of the HF diaphragm are related to several factors, but I don't think crossover frequency is one of them. If and when they occur in certain designs it's well above 520Hz, 900Hz, 3.24kHz, or whatever..
As the OP I was curious about IM distortions across such an unusually broad swath of audio frequency spectrum in the JM1.Prior art suggests that HF diaphragms do not remain anywhere near pistonic when so tasked at high power.If there are unique, Meyer-patented solutions, they are publicly available and protected, so please share! The prosound community is all-ears...(all puns intended).
IMD and breakup effects cannot be "canceled out" once they start, as far as I'm aware. THD can however.I can't say if the JM-1P horn's wide bandwidth (5 octaves) is directly related to a greater amount of IMD than if it were a three- or four-way design since I haven't tested that exact relationship. I hope this info is useful.JonMSLI
Jon,In reply to the question of what signal processing is capable of eliminating breakup mode and excursion related distortion, in Post #8 you replied:"None that I am aware of since these are non-linear effects."Now you seem to suggest that though IMD and breakup effects can not be "canceled out", THD can be, though I see no reference to any "distortion cancelling" processing utilized in the JM-1P, or any other MSL product, with the possible exception of the Pressure Sensing Active Control used on the LF portion of the X-10 control room monitor.
Typical 4" diaphragm horn/driver combinations exceed 10% distortion above 9 kHz at around 108 dB one meter, similar to the level the JM-1P HF should do (midband) at one watt, working back from a rated output of 138 dB at a presumed 550 watt peak. At an output level nearly four orders of magnitude higher, HF distortion must exceed 100%.
To insure having "enough rig for the gig", what SPL should users expect from the JM-1P above 8000 Hz without exceeding 10% THD?
Actual users Jon
Assuming you're right, I can't hear the 2nd harmonic of 9kHz or anything above that so what's the problem? Sorry Art, but I'm not going down this rabbit hole with you. Actual users can consult with our Design Services department for these kinds of questions. If they need more specific info (like THD percentages) then R&D will get involved.Jon
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