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Old 10th March 2011, 02:24 PM   #581
tb46 is offline tb46  United States
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Hi Again,

I just want to add: if I had to build a version of the SS15, I would take the attached drawing add a few more corner reflectors in the upper corners, file around a little at the details for the front chamber (and the box width) in Hornresp, and give that a try.

Regards,
Attached Files
File Type: pdf 2011_Feb23_mod_4.pdf (56.7 KB, 163 views)
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Old 10th March 2011, 02:55 PM   #582
jbell is offline jbell  United States
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Quote:
Originally Posted by tb46 View Post
jbell: I have the feeling you started with a much bigger version, and pared it down until you got the the point of no return. You certainly kept us busy. Nice work. :-)

Regards,
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Old 10th March 2011, 04:51 PM   #583
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Quote:
Djim: I'm not going to touch the subject of corner reflectors, or whatever somebody wants to call it. Screamerusa reported his empirical results in the furybox thread, jbell added his practical experiences, and after studying the general area of discussion (over a long time period, front horns, back-loaded horn fullranges) I know less than I did when I started.
tb46; I mainly put them in to brace the box, knowing thay would not cause any restricshoins.
Quote:
I looked at the Hornresp files for the SS15 and your modified version again, and found that the difference was mainly from slight changes in the way the original was done, and from the fact that I had not entered values for Vtc/Atc/Ap1/Lpt in the original. I redid the original using soho54's corner method, and added the same front chamber (right or wrong) in both models. They now are quite similar, with your modified version being slightly better in the 144Hz dip area. You'll have to enter the data into Hornresp to see the lines clearly. You can reduce the dips in that area by setting S1 to .01.
Thanks for looking into this for me. I had a sinking feeling when you said yours did not come out as good as my simulashoin.
Quote:
You can reduce the dips in that area by setting S1 to .01.
I was thinking of putting reflectors on the sides of the S1,S2 area in a "v" and making the width of the area 3.5" all the way. That would make the speaker mounting board stiffer, and you think it would help with the dips on the high end? thats a ++ if it will not effect the low end output.
Quote:
As to the purple line in the flare drawing (Post #559), it's just an attempt at showing the average of the respective tapers, kind of a general sanity check for the location of the Hornresp inputs (in other words: disregard if it gives you a problem).
Can you get it to bend at S3?
Quote:
To get this any better you will have to draw exactly what was build (which only the builder can do, as there are too many gaps in the dimensions), and use AkAbak.
I will be building next week, and pass along any changes for the record.
Thanks again for all you time. Andy
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Old 10th March 2011, 05:51 PM   #584
tb46 is offline tb46  United States
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Hi 4pyros,

"...Can you get it to bend at S3?..."

It can be done, but it's a bit of work. Here is just a quick look at it. After you make any modifications to the indicated panels you also have to work your way through the bends again, and transfer the result to Hornresp, and make modifications to the drawing, and so on.....

As to the S1/S2 area: screamerusa found it to be important to reduce S1, maybe take another look at the furybox. I think it can only help.

Regards,
Attached Files
File Type: pdf SS15_4pyros_mod_2011_Mar08_Try_1_flare.pdf (62.9 KB, 109 views)
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Last edited by tb46; 10th March 2011 at 05:53 PM.
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Old 10th March 2011, 10:15 PM   #585
Djim is offline Djim  Netherlands
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Hi Oliver,

I made a small correction on your drawing to get the outlines of the SS15 inclusive the corner volumes (just a rough estimation actually). Is there any way you can calculate the exact volume differences between prediction and real cab in the area between reference points 9 to S4?
Click the image to open in full size.
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Old 11th March 2011, 12:20 AM   #586
jbell is offline jbell  United States
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Just in case anyone is wondering, this is kinda what was in the back of my brain when I came up with the flare for the ss15... I'm still amazed that it is really this close, considering straight boards is all that there is to work with...
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File Type: jpg flare.JPG (22.1 KB, 407 views)
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Old 11th March 2011, 12:30 AM   #587
Djim is offline Djim  Netherlands
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JBell, is there much difference (in SPL plots) between your 'original green' and the HornResp that comes close to the concept you have now?

Last edited by Djim; 11th March 2011 at 12:38 AM.
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Old 11th March 2011, 02:21 AM   #588
tb46 is offline tb46  United States
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Hi Djim,

It's not as straight forward as it looks to get the respective volumes, e.g.: You may have noticed, that I like looking at the S4 dimension at right-angle to the centerline of the respective horn section in reference to the position of the cone, not necessarily the mounting position of the basket. Also, jbells explanation of his target flare makes a lot of sense. The purple line is just to check that I'm not too far off. Anyway, see the attachment.

Regards,
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File Type: pdf 9_S4_for_Djim.pdf (7.6 KB, 50 views)
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Old 11th March 2011, 02:49 AM   #589
Djim is offline Djim  Netherlands
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Thanks Oliver,

I think you forget something with your method. As long you don't introduce another reference point this goes straight into the corner you never get an accurate volume calculation (see purple line). That is my problem with this method. It also cuts of the path length a little (see blue line) although this is to small to be significant. So you wont see that back in your horizontal representation. If someone is going to use corner bracing from just above point 9 to a little after point 10 it will cut within the path. I hope my words make sense...
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File Type: jpg Corner_Reference_Point.jpg (39.2 KB, 346 views)

Last edited by Djim; 11th March 2011 at 02:56 AM.
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Old 11th March 2011, 02:55 AM   #590
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Quote:
considering straight boards is all that there is to work with...
Thats why I have two flare rates at the end to make it more exponential. So thare is one rate from S1 to S3, one from S3 to ref line #11 and one from thare to the end.
when drawn right it looks quite elegant. Andy
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