DCAudioDIY.com

The following link may be of interest -

https://www.keele-omholt-technologies.c ... 6-v8.1.pdf

Those are nothing new. Lot of speakers already use them. In this speaker, it applies only to the tweeters, not to the woofers behind them.

Show me one source which claims obstructing the driver is a good thing.

Ever see the guts of a horn's compression driver. It also depends on the wavelength at the crossover frequency. If the dimensions are small compared to a wavelength you are not in the wave propagation regime and the effects are quite different. Notice how the woofers are arranged in the Genelec 8361A speakers -

https://www.audiosciencereview.com/foru ... tor.28039/

Genelex's are not horn speakers. They are co-axials with wave guide, and bass reflex for woofers. They are not blocking the wave path like your JBLs are doing.

Probably. The point is you don't have to have megabuck components to get good sound. Great components for anything in audio not used properly will not give good results. Good components when used properly can give very good sound.

Very sad but true.

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Walt

As near as I can determine the midrange drivers crossover to the tweeter no higher than 800Hz where the wavelength is 0.43m. I would say that the spacing of the midrange radiator and the tweeter support are less than 1/8 wavelength at the crossover frequency. I do not see that as affecting the loading of the midrange. For diffraction effects look to the measurements. The shape of the tweeter support may even have the objective of reducing horizontal beaming of the midranges at the higher frequencies.

Crossover points have nothing to do with the concept of eliminating reflections. Look at the woofer in BMW speaker. It has a phase plug in the center. Its purpose is to stop the sound waves generated by the cone from reaching the opposite side of the code. IOW, protect the code from reflections. OTOH your JBL, is designed to create reflections on to the cones.

Non Logica. The phase plug (as you state) is designed to prevent "high-frequencies" from self cancelling [the size and positioning of the phase plug only impacts higher frequencies, reflecting them outward, and is transparent to lower frequencies] -- so your statement makes zero sense -- if the driver is not fed frequencies (via the crossover) that the phase plug could impact, then the cone will not move, and there will be no reflections that it will correct for -- so crossover points have everything to do with "maintaining linearity" of a driver.

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"We are all inventors, each sailing out on a voyage of discovery, guided each by a private chart, of which there is no duplicate. The world is all gates, all opportunities."
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Walt