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Old 17th March 2009, 05:27 PM   #1
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Default Waveguide and curved cabinet finished

I've nearly finished my latest project and thought I'd put up a few pictures. I'll attach a few more of the build shortly.

Here are the basics.

The two drive units are a Kappalite 3015 for the bass and a B&C DE-500 for the top end. The horn is conical with an aluminium adapter plate to mate the initial flare of the DE-500 to the 90 degree horn. It was the search for a drive unit that led me to this site and to the work of Earl Geddes. However, the horn was almost complete by the time I'd come across OS waveguides, and since it was time-consuming without a lathe, I'm in no hurry to do it again with an OS profile. But in light of what I've read here I'm interested to give it a go.

The bass cabinet is made from 4 layers of 6mm flexible MDF which, when fixed around the birch ply frame, gives a very rigid structure. The cabinet is lined with a heavy duty polymer damping sheet which seems to be a nice improvement on the bitumen pads. On top of this is a compressed wool felt, and directly around the driver is an additional layer of acoustic egg-shell type foam.

I wanted a kind of musical instrument look, hence the cabinet shape and the stainless steel frets on the front. There is still a few things to finalise, like the crossover (which is nearly done) and how to get the connection from the horn to the main cabinet to look tidy, but hopefully the next couple of weeks should see this all sorted. I built a rectangular test box prior to doing the real thing and like what heard, although there did seem to be a slight brightness to the sound despite a very flat response.

Steve
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Old 17th March 2009, 07:21 PM   #2
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Default Pictures - hopefully

Hopefully there'll be a picture this time.
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Old 17th March 2009, 07:34 PM   #3
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... and here's some from the build.
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Old 17th March 2009, 07:47 PM   #4
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looks awesome....

we share the same style ques...
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Old 17th March 2009, 07:53 PM   #5
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stunning work. brilliant.
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Old 18th March 2009, 02:33 AM   #6
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WOW!......very original and contemporary....Bravo!
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Old 18th March 2009, 03:16 AM   #7
domtw is offline domtw  France
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Very nice looking and finishing !

What is "flexible MDF" is it a special kind of MDF or it is flexible because of its small thickness ?

About the horn: how did you smoothed the inner cone from the piled up rings ? Have you used a lathe ?
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Old 18th March 2009, 03:53 AM   #8
lowpoke is offline lowpoke  Australia
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Attention to detail is truly impressive.
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Old 18th March 2009, 07:28 AM   #9
Helmuth is offline Helmuth  Netherlands
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Real quality work, finishing
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Old 18th March 2009, 07:32 AM   #10
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Quote:
Originally posted by domtw
Very nice looking and finishing !

What is "flexible MDF" is it a special kind of MDF or it is flexible because of its small thickness ?
If you look at the pictures, you will see that the MDF is kerfed.
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