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Old 21st April 2012, 01:55 PM   #31
tomlang is offline tomlang  United States
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A few things I need to mention about my version of this:

1. I simplified the front final flare so no "fussy rounding" would be necessary. It will add volume to the space behind the driver but I will calculate the difference and simply add volume later (and remove it if detrimental for some reason).

2. I eliminated the option of a removable front baffle as I have no intention to try internal 5 inch drivers.

3. I eliminated the reflectors at the first bend for this reason as stated in the White Paper -- "Parts P & Q are actually panels that set the proper angle for the bend in the horn flare. These angles will reflect high frequencies that are too short to make the bend and thus increase the bandwidth of the flare to 4500 Hz when four 5 inch full range drivers are used on the inside of the cabinet instead of the single 6 inch front mounted arrangement." These could easily be added later if necessary.

4. I intend to build these with enclosed sides but NOT extended out past beyond the flares. That allows the possibility of easily attaching extended wings later if not used in a corner -- "hinged" extended wings?

5. It appears I can construct my version with 13 different parts (not including mirrored parts) instead of 18 different parts as shown in the plans.

Finally, creating the 3D model really helped visualizing this. I know it would nowhere near have been as easy to model this using the plans alone. "In progress" pics found on the internet helped immensely.

Dennis, I look forward to your impressions of the new set being built. Also, please post pics if you are able.

Last edited by tomlang; 21st April 2012 at 01:58 PM.
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Old 23rd April 2012, 10:02 PM   #32
tomlang is offline tomlang  United States
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Below are pics of how I numbered the pieces in my trial-for-fitup "quarter section" of the horn using the same 3/4" plywood as I will be using for the final horns.

Next shown is the full horn base piece with the 1/4" channels for placing the pieces into.

Last two pics are 3D model (looking underneath) part 11 and then the rendering of it cut out in plywood. Machining time will take about half an hour for this piece due to the miters.

It may be awhile before I get a chance to cut these pieces and assemble this "quarter section" due to other priorities. The "quarter section" will make a cool cut-away model.
Attached Images
File Type: jpg Master.jpg (129.4 KB, 239 views)
File Type: jpg base.jpg (78.8 KB, 227 views)
File Type: jpg FinalPart 11.jpg (81.2 KB, 223 views)
File Type: jpg piece 11.JPG (31.3 KB, 218 views)
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Old 26th April 2012, 05:59 AM   #33
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Quote:
Originally Posted by Bigun View Post
Which drivers are recommended for the 4-speaker arrangement ?
There weren't any drivers recommended. The White Paper is silent as to the 4 speaker details. I would have liked to have seen even a rudimentary frequency curve for the 4 speaker system or maybe a description of the issues that Steve mentioned.
I am curious as to what a four speaker true horn system would sound like but not enough to spend the time and money to find out.
There was mention that the four speaker system produced too much bass for home use. so what would happen with a 2 speaker system?
Eventually the satisfaction of my curiosity will win out and I will build a single test speaker and install two five inch bass/mid speakers in it in front loaded horn configuration if someone else doesn't do it first.
Madisound has several 5 inch mid/bass speakers with Qts less than 0.3 and Fs in the right range. Only problem with the four speaker system is that the speakers cost in the $50 each range and all eight will cost $400 plus cabinets plus tweeters.
I am not sure that I have that much curiosity so I will just make a single test speaker with 2 drivers. I already have a bucket of tweeters.
I am $200 curious.
Will write a report when I get to it.
Dennis

Last edited by Dennis Rech; 26th April 2012 at 06:12 AM. Reason: Type
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Old 26th April 2012, 05:02 PM   #34
chrisb is offline chrisb  Canada
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Tom:

ambitious project, but I'd suggest you contact Steve regarding your plans to "simplify the fussy rounding" in front flares - regardless of his often creative descriptions, there may be some very good acoustic reasons to retain them.

also, IINM the special custom modded driver that Steve recommends for this design is based on the FE166E ( now En)


Dennis:

clearly the added side panels free this design from the constraint of corner placement - did you find much of a decrease in bass extension?
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Old 26th April 2012, 10:13 PM   #35
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Quote:
Originally Posted by chrisb View Post
Tom:

ambitious project, but I'd suggest you contact Steve regarding your plans to "simplify the fussy rounding" in front flares - regardless of his often creative descriptions, there may be some very good acoustic reasons to retain them.

also, IINM the special custom modded driver that Steve recommends for this design is based on the FE166E ( now En)

Dennis
clearly the added side panels free this design from the constraint of corner placement - did you find much of a decrease in bass extension?
Readng the White Paper, it appears that Steve went through all the calcs for a front loaded horn enclosure using 4- 5 inch speakers buried in the cabinet. For some undisclosed reason, he sort of abandoned this configuration and stuck a front facing Foxtex in the rear cavity of this horn and converted it to a ported bass reflex speaker with a megaphone on the port.
It worked serendipitously well, but not likely due to any special engineering of the cabinet fronts.
Most of the sounds come from the front facing Fostex and it works about as well as any other Fostex in a box. Most Fostex's are put in a box with square fronts and this one will work about as well as the others with a flat face.
I used a Fostex 166en because it superseded the 166e. I do not believe that Steve recommended it and I have never seen any recommendations for the 4-5 inch speakers in the original cabinet. In theory, they need a a frequency response past 4500, a low Qts and a Fs at least 25% about the 40 to 50 Hz cut off frequency.
Steve wrote that he only built the prototype and it sounds like he never experimented with mods at all. He may have hit a home run right out of the box or there may be more to be found.
We will see.

The temporary side panels provided enough bass that I was satisfied with the system while I completed a corner. The two configurations sound different, but it is not in the lower frequencies. Room placement and axial response probably are the reason. Remember, in back loaded horn configuration, only frequencies below 150 Hz are affected.
There is a difference, but I do not know if there is an improvement.

Dennis
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Old 28th April 2012, 09:13 PM   #36
Bigun is offline Bigun  Canada
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Having taken a closer look at the corners I can use, this corner horn no longer looks like a practical option for me. Still, it got me interested in horns again.
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Old 13th April 2013, 02:30 PM   #37
tomlang is offline tomlang  United States
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A year has passed and other priorities kept cropping up. Among other things I did build a Mileva and a MLTL with the FE167en's.

That said, it sounds like (but I cannot find officially) that the FE166e is the preferred speaker for the Decware Corner Horn.

Has anyone else made progress here or on any related projects to this?
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