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Old 7th April 2013, 05:57 PM   #11
WrineX is offline WrineX  Netherlands
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Quote:
Originally Posted by AndrewJ View Post
Actually, the response is quite easy to calculate. It is the difference between two concentric diaphragms, one of 24cm diameter and the other of 17cm diameter. Since each would have horrible off axis response at high frequencies, I would expect the difference response to be equally bad.

Not worthwhile pursuing!

Andrew
Well THE esl is not 24 cm in diameter , it's a ring so actually it's 3 cm wide. Of axis should be ok at 3 cm, de woofer ofc will not have good of axis at high freq but it should crossed bellow 2 K or something. You are right that it could end up in complete failure. But it is hard to tell what it is going to do exactly
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Old 24th April 2013, 06:11 PM   #12
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Quote:
Originally Posted by WrineX View Post
Well THE esl is not 24 cm in diameter , it's a ring so actually it's 3 cm wide. Of axis should be ok at 3 cm…But it is hard to tell what it is going to do exactly
Off axis response deteriorates because of path length difference between different areas of a radiator. The differing path lengths shift the phase of the sound arriving from different areas resulting in cancellation rather than summation. So even if your ring is 3cm wide, there will be a considerable path length difference between areas of the left and right sides of the ring when listening off axis. Note difference in red and green lines in Attachment #1.

As AndrewJ mentioned, the off-axis response for the ring will simply be that for a 24cm piston minus that for a 17cm piston. You can calculate this using the Bessel directivity function for a piston that can be found in any acoustics text, or brute force summation of a large number of point sources distributed around the 3cm ring. The results are the same, and are plotted in Attachment #2 for a couple off axis angles.

Note that the ring has worse off-axis response than even the 24cm piston.
Looking again at Attachment #1, you can see that this makes sense because when you remove the inner 17cm area from the 24cm piston there will now be(on average) larger differences in path length between all areas of the radiator.
Attached Images
File Type: gif Ring_figure_v2.gif (14.8 KB, 46 views)
File Type: gif Ring_response.gif (72.6 KB, 46 views)
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Old 24th April 2013, 06:53 PM   #13
WrineX is offline WrineX  Netherlands
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Wow thx for THE explenation! So Im convinced its à no go ! Wint waste material And time
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