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Multi-Way Conventional loudspeakers with crossovers

Has anyone tried these MMTMM configurations?
Has anyone tried these MMTMM configurations?
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Old 14th April 2018, 07:04 PM   #31
Juhazi is offline Juhazi  Finland
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^Wouldn't it be easier to just use minimal diameter drivers per "way" to get smooth and wide dispersion?

Well then we encounter the distortion challenge... But if we discuss only normal home environment/sound levels, there should be no problems with that. Examples - Yamaha NS-5000, Magico, Avalon, PMC, Harbeth, etc. 3-way speakers with 3-5" midranges and dome tweeters.
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Old 15th April 2018, 11:18 PM   #32
hollowboy is offline hollowboy  Australia
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Quote:
Originally Posted by Juhazi View Post
The patent and measurements in it are just rubbish.
Rubbish how? Are you implying that the measurements are false / fabricated?

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The 4-driver flower is acoustically like a single 15" [...] Sure it is different above 500Hz
Yes. This appears to be the point.
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Old 16th April 2018, 07:09 AM   #33
Juhazi is offline Juhazi  Finland
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^A quadruple (or any group of widerange transducers) has similar directivity as a single driver of same outer diameter. The patent application and controllees just didn't know that. Poor understanding of the topic! It should be impossible to get a patent to a law/ phenomenom that is just basic physics!
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Old 16th April 2018, 07:46 AM   #34
hollowboy is offline hollowboy  Australia
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I see what you mean. The patent is just a rotation of a basic array, so may not be sufficiently novel:
"Using this method, a typical speaker array may attain benefits disclosed herewith."

However:
"Embodiments of the present invention achieve this result by an advantageous arrangement of transducers."

The specific details of the "advantageous arrangement" seem to be the point of the patent.

To me, it is not immediately obvious how you would get the pattern shown in figure 22 rather than the pattern in figure 20. If literally nobody had produced or illustrated this benefit of skewing an array in this manner*, that implies it wasn't immediately obvious to anyone else, either.

Note that the patent is hella old, doesn't apply to DIY, and I'm not a lawyer, so I don't really have a horse in this race

*I believe a requirement of a patent is that it hasn't been made / described / illustrated publicly elsewhere
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Last edited by hollowboy; 16th April 2018 at 07:49 AM. Reason: grammar
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Old 16th April 2018, 08:18 AM   #35
Juhazi is offline Juhazi  Finland
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With a loudspeaker simulation software it is easy to test jos multiple driver groups behave. They were not so easily available 10 years ago.
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Old 16th April 2018, 05:30 PM   #36
nc535 is offline nc535
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There is a way to get multiple drivers to behave as a point source without beaming and lobing problems. For a clue, look at my signature

BTW, one of the drawings in the Synergy patent shows a relatively large number of drivers surrounding a central driver on a baffle. Basically, a baffle is a 180H x 180V horn. Its much easier to get the drivers close enough together when they are offset mounted on the sides of a less wide dispersion horn.
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