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RE: Show me a current monitor

I think you may be barking up the wrong tree. Angling the woofer panels by 20 degrees or so has little to do with diffraction around the sides, but will affect the dispersion pattern, by possibly reducing lobing and uneven dispersion due to constructive and destructive interference between the woofers on either side of the cabinet. Whether or not KEF chose the angle scientifically through measurements, or just guessed, I wouldn't know. Or, as I wrote in an earlier post, it may just be for aesthetic purposes, to make the box look less boxy.

On the other hand, the "Blade" series with woofers on the sides is a different animal. Although the woofers are smaller than in the KM1, they still cross at 350 Hz or higher, depending on the model. Using 1129 feet per second as the speed of sound, the wavelength at 350 Hz is about 3.22 feet. With a nominal woofer diameter of 9 inches and an effective radiating diameter of about 8 inches, it is likely that the dispersion pattern is "adequate", especially given that the forward-oriented midrange driver overlaps the upper end of the woofer frequency range. It would be interesting and useful to see a polar plot of the actual dispersion pattern.

I haven't heard any of these speakers, whether well set up or not, so I can't comment on their actual resulting sound. In any case, as you might know, what one person thinks sounds fine or great, another person doesn't like.

Just as a sort of add-on to the discussion, here is a page about diffraction, as applied via an opening in a wall. The same concept applies to baffle edge diffraction.



(Source: Olson, "Music, Physics and Engineering")

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Edits: 03/29/25
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