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Old 16th April 2012, 04:24 PM   #21
JZatopa is offline JZatopa  United States
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If you decide to build them, is there any chance you would build an extra pair for sale or sell the parts as a flat pack?
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Old 16th April 2012, 05:54 PM   #22
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Quote:
Originally Posted by Bigun View Post
I haven't made a decision about building them yet - the issue is making sure I have a corner to use one in before committing to it.
The corner I have available isn't huge, there's a window near the corner, I probably have 18 inches of space.
The DecWare White Paper said something about these speakers needing to be placed in a corner and the sides were intentionally left off so they had to be used in a corner to work, but some idiot would eventually put them in the middle of a room.
Steve was probably thinking of me when he wrote it.
I built one speaker as a test when I had one corner available.
I liked it a lot, so I built a second speaker and while building a stub wall along the long wall of my shop, I decided to use the speakers. I had a couple of half sheets of 5/8 inch drywall awaiting the framework and I tacked it on one of the open sides of the second speaker, the other side was against a wall. It worked great. I then added a second 4x4foot piece to the other side and faced it out into the room. It also sounded great, maybe better than the first speaker in the corner in that the Fostex's were no longer firing at a 45 degree angle.
Whatever bass the horn lost by not being in a corner was equalized by the extra side wings now added, turning a 14 square foot mouth into a 24 square foot mouth.
If one only has a single good corner and a blank wall, one can add a side to the second speaker, or set a bookcase or file cabinet against it. The speaker doesn't know that its not a wall.
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Old 16th April 2012, 06:10 PM   #23
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Quote:
Originally Posted by tomlang View Post
Do you have Partworks with your Shopbot? If so, use the Create Fluting Toolpath and in my case, the same 1/4" flat endmill bit as I cut the parts out with.
I can't find a photo or scrap piece right now of the results but would be happy to send you a Partworks file of how I do this...
Hi Tom, No need to send a Partswork file, Your instructions are easy to understand. Next time I need to cut a strange angled bevel, I'll give it a try.
After you receive your plans and if you decide to built the horns, let me know and I'll send you my Partswork files for the horizontal pieces and if you are so inclined, you can send your files for the vertical pieces.
If we can do these on the ShopBots, life will definitely be a lot less dusty.
Dennis
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Old 17th April 2012, 08:51 PM   #24
Bigun is offline Bigun  Canada
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Quote:
Originally Posted by DJNUBZ View Post
If you decide to build them, is there any chance you would build an extra pair for sale or sell the parts as a flat pack?
Hi, were you asking me ?

I'm not sure, but I suspect the plans from Decware prohibit anyone from building them for sale without a license from Decware.
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Old 18th April 2012, 04:31 AM   #25
JZatopa is offline JZatopa  United States
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Quote:
Originally Posted by Bigun View Post
Hi, were you asking me ?

I'm not sure, but I suspect the plans from Decware prohibit anyone from building them for sale without a license from Decware.
Yeah, I would still buy the plans from steve.
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Old 19th April 2012, 09:17 PM   #26
tomlang is offline tomlang  United States
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I got the plans, had a couple rainy days, and did a quick model in Google Sketchup. Rather than rounded in the front I simplified it.

Next step is to deconstruct the model making all the pieces larger to embed 1/4" into adjacent pieces and cut 1/4" channels to accept those pieces.

After that each piece has to be exported into the CNC software for toolpathing the weird angles and cutting it all out. Since this thing is symmetrical top to bottom and side to side I will make a mockup of 1/4 section of this thing to verify fitup.
Attached Images
File Type: jpg cornerhorn full model1.jpg (57.9 KB, 278 views)
File Type: jpg cornerhorn full model2.jpg (106.2 KB, 274 views)
File Type: jpg cornerhorn full model3.jpg (131.3 KB, 272 views)
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Old 20th April 2012, 12:37 AM   #27
Bigun is offline Bigun  Canada
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Quote:
Originally Posted by DJNUBZ View Post
Yeah
Well I certainly appreciate your confidence in my abilities!

Actually, it looks a pretty challenging build and I doubt I would want to commit so much of my time to making several of them. I plan to make one. I am looking to 'fill my house with sound' and my experience to date with stereo tells me I'd be wasting my time building a pair. Mono is where I'm heading with this idea for now. This means I only need to make use of one corner in my house. And that greatly simplifies the implementation because then it no longer depends so much on finding two available corners that are both suitable and both the right distance apart and dealing with sound stage issues etc.

The main floor of my house is shared with my family. It means a dedicated stereo set up for me, with everything in the right place and enough peace and quiet to make proper use of it is - futile. We get good use out of my DIY amps and speakers but it's always based on them being located where they are out of the way and the sound is allowed to float round the main floor of the house for all to enjoy. Even our mono kitchen radio gets good use. I see a lot of potential for a mono horn set up. And I get to make one cracker of a mono tube amp since I can then spend twice as much on one channel compared with a stereo.
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Old 20th April 2012, 08:02 PM   #28
tomlang is offline tomlang  United States
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Default Build with Sides?

Putting sides on adds alot of support for the flare wings. I doubt any internal bracing would be required with sides. In my opinion, based on Dennis's tests above, that adding sides would not have any change on the sound.

Also I show one (getting even larger) with extended sides. Dennis is this basically what you did?
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File Type: jpg cornerhorn full model sided - Copy.jpg (138.5 KB, 232 views)
File Type: jpg cornerhorn full model extended sides.jpg (114.9 KB, 211 views)
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Old 20th April 2012, 10:42 PM   #29
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Originally Posted by tomlang View Post
Putting sides on adds alot of support for the flare wings. I doubt any internal bracing would be required with sides. In my opinion, based on Dennis's tests above, that adding sides would not have any change on the sound.
Also I show one (getting even larger) with extended sides. Dennis is this basically what you did?
Hi Tom,
This is what I did.
DecHorns with wings.jpg
After I nailed the Sheetrock to the walls, I used a couple of pieces of 3/4" mdf (recognize the spoil boards from the ShopBot?). It provided bass about equal to the corner placement. These were used for a few days while the drywall mud and paint dried.
I am not a golden Ear audiophile. I cannot hear the enormous improvement in sound stage that comes from changing speaker wire. Nor can I observe a tremendous improvement in frequency response when plugging into a hospital grade receptacle. I built speakers for sale for a number of years and modified them many times. I could hear the modifications, but often could not tell it they were better or not. I really do not know what Alison Krause actually sounds like, so when I read that doing certain changes now make her sound perfectly lifelike, I just shrug. So take my observations with a grain of salt again.

Without corner placement and without wings, the Fostex's sound sort of like Fostex's in a ill designed cabinet. Sort of screechy without base. With the wings and against a wall verses corner placement, the speakers both sound very good but a bit different from each other. With the Fostex pointing straight at you instead of usually off axis, highs and mids are more pronounced. I don't know if that is good or bad, just different.

I stole one of your drawings because it shows the innards of the horns better than anything else that I have found. It has now been added to my show and tell of how these horns are made. Thanks.

I really like the drawings of the extended wings. I may have to make a set of wing extensions just because they look so neat. Technically, they should angle slightly outward to provide a properly expanding horn. In reality, I doubt that one could hear the difference. The JBL guys once told me that most record companies cut the recording off at 50 Hz because there is little musical information below that and mostly just turntable rumble.

I did not use any bracing on the wings. The speakers were getting heavy so I avoided the bracing and dropped the wings down to 3/8 ply because I had some. I also just hot glued the wings on so I could get them off if I wanted to move the speakers down into the basement. I have had no problems at all with rattles or resonances. I am pretty sure that they are overbuilt by a factor of a lot. I also put the tops and bottoms on with gaskets and screws so I could get back in them if I needed to make changes (like trying out the 4 speaker arrangement). Trust me, they are pretty awkward to move when fully assembled.

There is a set of these being built not far from here. They should be finished next week. I am looking forward to hearing them in a household setting.

Keep us informed of your progress.

Dennis
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Old 21st April 2012, 11:33 AM   #30
Bigun is offline Bigun  Canada
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Originally Posted by Dennis Rech View Post
I also put the tops and bottoms on with gaskets and screws so I could get back in them if I needed to make changes (like trying out the 4 speaker arrangement).
Which drivers are recommended for the 4-speaker arrangement ?
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