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Multi-Way Conventional loudspeakers with crossovers

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Old 28th November 2012, 05:27 PM   #731
Pano is offline Pano  United States
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If you can get your plot printed to scale, you can use that. That's what I did with my Tractrix horns. I may be able to scale it up to the right size for you, if you don't have the means.
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Old 28th November 2012, 06:02 PM   #732
sippy is offline sippy  United Kingdom
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Fired up cad, loaded the curve in and scaled it really close:
Length seems correct, mouth opening seems slightly too small - maybe 2.5mm shy.
Mirrored the image - without spending lots of time to draw properly, the two images can be printed onto 3 tiled portrait A4, adjust tile overlap to .125 (3.2mm - 1/8th inch).

Get bit of hardboard, draw centre line, draw 20mm line at 90degrees one end, mouth opening 165mm at the other bisecting center line.
Use 20mm line as throat reference and rotate print till mouth sits at 165 - or half these values, give one is working with half image.
If it don't look right, let me know in which way and I can re-scale slightly for you.
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Old 3rd December 2012, 12:16 AM   #733
Pano is offline Pano  United States
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Hello, hello! Where has everybody gone? I'm hoping to see some "work in progress" photos.
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Old 3rd December 2012, 02:58 AM   #734
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I've been snowed under with work - maybe this week I'll manage to make a start on a cell, got lots of scrap 80 and 100gsm A2 paper, just need to make template and a form.
I did manage to speak to my foam cutting expert buddy, he said that the idea of cutting walls from blue foam with 3 layers of paper would be a good idea, but tooling up for consistent results would be a pain in the rear for just 1 pair 10 cell of arrays.......
Idea not counted out just yet though
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Old 8th December 2012, 12:45 PM   #735
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Sorry for the lack of movement guys - the normal schedule will resume shortly.

Been going barmy - bipolar manic phase got a bit out of hand. Best i can describe my concentration, ability & efforts is like trying to compete in the Olympic 50m Rifle with blunderbuss. The results can be awe inspiring, spectacular even, target is never hit and theres a lot of clearing up afterwards...........my poor wife

On the other hand I'm taking enough pills to sedate an elephant and they seem to be working

I'll be back............................next week
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Old 8th December 2012, 02:22 PM   #736
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Know what you mean...really. Take a long walk, a deep breath, a big drink, and give a big hug. Well becwaitin on ya!
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Old 8th December 2012, 02:43 PM   #737
Pano is offline Pano  United States
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Ahh.... that explains you little dancing man avatar. Makes sense.
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Old 8th December 2012, 04:21 PM   #738
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Not that I am going to produce one of these large multicell horns but has anyone considered either aluminum tig welded to create the cells or even a simple pattern and fiberglass construction?
Aluminum could be cnc cut and easily tack welded together. Fiberglass and vinyl ester resin are available at many boat builder supply houses and this would make a very rigid construction.
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Old 8th December 2012, 08:15 PM   #739
LFM is offline LFM  Canada
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Smile Something really big

This is still on my to do list. I just haven't had the time but I will get around to it. I planned to use birch or some similar veneer and layer it to form a plywood like structure. I was thinking of just using carpenter's glue. What I'm thinking now is to use fiber glass resin and try and mimic Panzerholz plywood. I learned about this when searching for Plinth materials for my old Rega Planar 3. I stumbled across it on a Lenco turntable website. It is supposed to be very non resonant. There is an alternative which may fall in line with the previous post. Aluminum sheet with wood veneer sndwiched between is also supposed to be excellent as well. What a hobby. I started out making an ultrasonic record cleaning machine as per the thread in Analog Source. It was so successful that it led me to search out upgrades for my Rega. At the same time'I have been following the Beyond the Arial thread and that led me to Pano's 1005's and this thread. The turntable searches have led me to the 2 possible materials to consider and that means I'll have to build one of each. It just goes on and on. I don't think I'll ever get bored with this hobby but sometimes I think my head may explode.
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Old 8th December 2012, 10:23 PM   #740
fas42 is offline fas42  Australia
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Quote:
Originally Posted by JRKO View Post
On the other hand I'm taking enough pills to sedate an elephant and they seem to be working

I'll be back............................next week
My sympathies ... when one's head plays silly buggers it's one, right pain ...

Frank
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