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Old 29th May 2013, 01:39 AM   #901
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I got the blueprints today; looking at the size of these horns, if I don't get a solid 35hz out of this thing I'll be let down. I decided to try the two-horn version first since it will be easier to make.
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Old 29th May 2013, 02:34 AM   #902
xrk971 is offline xrk971  United States
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Chaz,
The design has solid bass extension to 50 Hz (90 dB) and will only have 75 dB at 35 Hz. This is at 3 meters away. You are going "off-reservation" if you make the 2-horn version - I can't guarantee the 35 Hz extension because there are a lot of things at play here: throat, chamber volume, channel width, mouth expansion ratio end-correction. Making a mouth expand greater than original will reduce extension. I would be patient and do both passages - you will get a better sounding product.
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Old 29th May 2013, 05:31 AM   #903
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maybe I'm not reading the graphs correctly, but just looking at the original design, isn't the 2-horn option showing strong output into the mid-30s?
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Old 29th May 2013, 09:55 AM   #904
xrk971 is offline xrk971  United States
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Chaz,
The response curve for the 1.2m above floor case on post 880 I think is below. It starts to decrease at 50 Hz and has output at 75 dB at 35 Hz - don't know if you call that substantial. The Panpipe pentahorn BLH design on the FC thread goes to 30 Hz before it starts to decrease, but that is a completely different design that is my own and optimized from the ground up for the W5-1611.

Here is the Cornu response with the W5-1611and front horn
Click the image to open in full size.

Here is Panpipe BLH with the W5-1611
Click the image to open in full size.

Maybe you are mixing the two up?

Last edited by xrk971; 29th May 2013 at 09:59 AM.
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Old 29th May 2013, 02:54 PM   #905
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This is the one I'm talking about.
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Originally Posted by xrk971 View Post
Click the image to open in full size.
The panpipe looks pretty sick, by the way. Anyway, since I went ahead and printed the two-horn design, I'll go ahead and make it; there's not much risk involved and there are a few other reasons why I'm hoping this design could be made to work. For example, the diamond-shaped baffle could be made out of 2'x4' boards which are widely available pre-veneered. If it doesn't work out then I'll go back to the 4-horn version!
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Last edited by chazdrumzalot; 29th May 2013 at 03:03 PM.
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Old 29th May 2013, 03:52 PM   #906
xrk971 is offline xrk971  United States
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OK, the 2x4 ft veneer panel is a good reason. Good luck!
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Old 29th May 2013, 10:37 PM   #907
prezden is offline prezden  Canada
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Default W4 Progress Report

Hi Guys
I thought I would post a few pics of my new Cornu's. I've done a few things a bit differently in terms of building method. After only an hr. listening with one clamped together I'm pretty satisfied and will glue up the front panels later.
Attached Images
File Type: jpg 24-1.jpg (397.5 KB, 247 views)
File Type: jpg 22-2.jpg (335.4 KB, 235 views)
File Type: jpg 22-3.jpg (357.8 KB, 138 views)
File Type: jpg 22-4.jpg (321.7 KB, 144 views)
File Type: jpg 22-5.jpg (340.1 KB, 140 views)
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Old 29th May 2013, 10:39 PM   #908
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Excellent work there prez.
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Old 29th May 2013, 10:47 PM   #909
xrk971 is offline xrk971  United States
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Prez,
Did you cut into the driver chamber and channels in order to make room for the oversized driver? Looks really good. What is that you are using for stuffing?
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Old 30th May 2013, 02:23 AM   #910
prezden is offline prezden  Canada
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Thanks guys
As it turned out I didn't have to cut into the channels at all. It's a snug fit but I think it's ok. The stuffing is a layering of poly felt pad cut to the shape of the chamber bottom then around the sides. I put some stuffing in 2 of the chambers with a string attached so I can pull it out if need be.

cheers- prez
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