Urr humm !
Yeah, yeah, its coming . Need to get a 4343a refurbishment done first . Make horns and then WAIT !..... for someone to finish his silly speakers
Seriously, I don't think there is a single forum member thats not excited for you Sir !
Rich
Guido: Very interesting and exciting visually.
What are your plans (if any) for a grille (on the woofers)? A sculptured foam grille which I can supply could add substantially to the visual aesthetics.
My point is a sculptured foam grille adds a three dimensional look which compliments the overall product aesthetics - prime example being what a sculptured foam grille did for the appeal of the L100 model.. Also helps minimize diffraction while being acoustically neutral.
One EV2 is up and running.
I still need to modify the LF/MF crossover region a bit to get the EV2 voicing for higher sensitivity (use of 2x1500AL). That is why the MF crossover is still outside the cabinet and on an evaluation board.
Also the 045Be-1 UHF is app. 4db "behind" the rest of the system because it simply don't have enough SPL. It CAN be heard though.
Will post some PRELIMINARY pics and curves these days.
Oh BTW... sounds nice, even in mono
Your work is fantastic. My personal admiration.
I only wonder what would be the horizontal dispersion characteristic of such large horn, especially after so many 'flattening' MF crossover, and 'pushing' MF driver to operate up to almost 20kHz.
I wonder here if something improvements in the horizontal plane can be get with some kind of "fins" (such as 2397), because I expect that such large horn would be "beamy", especially at the frequency over 7kHz. Anyhow your measurements would give us the answers.
My Regards
Ivica
It is beamy due to the large aperture, hence the small aperture 045 to maintain off-axis power response. In the Everest II design, the 045 arguably comes in a bit too high. Perhaps the S9900 implementation is better.
Just looking at the photos of the DD66000, I have expected that large MF driver horn aperture would produce "beamy" off-axis response, especially, for higher frequency, but I have no idea how "bad" that would be. Here small aperture UHF driver (045) 'has small part" of spectrum to reproduce, due to very high ( 4th-order) high-pass cut-off frequency- I expect over 16kHz, so its contribution in frequency dispersion is very "weak".
On the other side if UHF 045 would "get an opportunity" to reproduce wider part of audio spectrum, because of its geometrical position in relate to MF driver, I would expect "comb" effect in the response ( what is visible on the 434x old studio monitors), or even on K2-S9900
http://www.jblsynthesis.com/download...2S9900OMhr.pdf
It is nice opportunity that Guido would be willing to do some F_R measurements, not only "in-axis", but I believe something "out-of-axis", so that information would be available. "Interesting" that such information is not generally available.
Here is a plot taken of one of my Everest IIs... taken from the listening position all room effects, floor bounce etc. are present in the plot. The blue curve is with the tweeter disconnected and the red shows the comb filtering. The effects are at such high frequencies and fairly subtle... I certainly don't the difference.
As to the beaming of higher frequencies? I suppose, but it is still better controlled and images better than say a 2397 or any of the radial horns I've heard with or without fins/vanes.
Widget
If you want to hear what the 045 can do the Array is the best option. Lower crossover point. Comb filtering clearly visible in the measurements.On the other side if UHF 045 would "get an opportunity" to reproduce wider part of audio spectrum, because of its geometrical position in relate to MF driver, I would expect "comb" effect in the response ( what is visible on the 434x old studio monitors), or even on K2-S9900
Rob
"I could be arguing in my spare time"
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