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Old 29th December 2013, 04:08 PM   #11
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So happy to see it working this well. You certainly inspire.
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Old 29th December 2013, 05:28 PM   #12
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Quote:
Originally Posted by tinitus View Post
elliptic might be a really great match for your method
and shape the wood edge round, where the poly film is pulled down
This is not a promise, but I might try elliptical waveguides later, maybe during this winter. This method is perhaps not the easiest DIY method but it makes possible to make difficult shapes quite easily.

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Originally Posted by Cal Weldon View Post
So happy to see it working this well. You certainly inspire.
Thanks for the kind words
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Old 29th December 2013, 08:32 PM   #13
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by Erkki Rasanen View Post
This is not a promise, but I might try elliptical waveguides ...
I forgot you are doing it for an 8"
elliptic might get much bigger
so probably better for smaller drivers

shape looks great on this photo
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Old 29th December 2013, 09:18 PM   #14
OllBoll is offline OllBoll  Sweden
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While we are at it I might throw more questions =)

Where do you expect to control directivity with the waveguide, in the crossover region of the cone driver or on the compression driver? Are you doing it for more gain at X frequency or to control dispersion? Or are you doing it becaise you can?
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Old 30th December 2013, 07:21 AM   #15
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Originally Posted by OllBoll View Post
While we are at it I might throw more questions =)

Where do you expect to control directivity with the waveguide, in the crossover region of the cone driver or on the compression driver? Are you doing it for more gain at X frequency or to control dispersion? Or are you doing it becaise you can?
Good questions. I'm not an expert in this area, so please guide me if I get too deep in the forest...

I am expecting better control of directivity and dispersion in the crossover region of the cone driver. I tried to simulate this behavior with Hornresp wavefront simulator. However, simulations don't tell the whole truth and I'm planning to do proper measurements and comparison to direct baffle when the speakers are ready.
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Old 30th December 2013, 11:24 AM   #16
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Hello Erkki, nice work.

Recently I saw a work colleagues custom car door pods.
His method was to stretch a polyester cloth over a forming board, similar to your method, but no creases/wrinkles to contend with.
He then soaked polyester resin into the cloth, and allowed that to set.
This forms a shaped stiff layer that can be back filled with glass fibre matt, and more resin, building the thickness up in layers....ala boat building.
The resin soaked cloth then forms the visible surface of the assembly, and this can be left as is, or painted etc.
The driver mounting ring is also locked into the glass/resin.

His result is visually very professional, and extremely durable/inert.

Dan.
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Old 30th December 2013, 12:13 PM   #17
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Max H; I actually copied the principle of that method. It's useful method and I have done a car subwoofer that way. This time I used plastic because I hoped I could get smooth and glossy surface that wouldn't need painting and polishing.
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Old 30th December 2013, 12:25 PM   #18
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Your glossy surface looks good, but the cloth surface would not harm the sound, maybe beneficial, and a lot easier.
I hope you get the sound you want.

Dan.
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Old 30th December 2013, 02:40 PM   #19
wesayso is offline wesayso  Netherlands
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Your method could even incorporate a round over at the mouth with some work.
I like the results you got! Can't wait to see what it actually does.
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Old 30th December 2013, 06:30 PM   #20
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Now I have molded all the waveguides I need but my friend got interested and I will make a pair for him also. Now it's been quite easy; I just wax the mold once, spray the hairspray over the surface, cut cloth to pieces and start laminating. About an hour and it's done.

I will start making the enclosures in the weekend (perhaps). Unfortunately I don't have the drivers yet. I ordered (and paid) them in early November but the dealer said there were no drivers available and production was scheduled to December...
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