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Old 7th January 2013, 05:06 PM   #2301
tommy_o is offline tommy_o  United States
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Quote:
Originally Posted by xrk971 View Post
I just finished one horn inspired by the FH3. The height is 30 in tall (limited by foam core stock). I scaled the internal cross sections to a Vifa TC9FD 3.5 in driver's Sd. This resulted in a cabinet internal dimension of 4.5 in wide x 5.0 in deep, and a terminus choke width of 1.33 in. The rear horn expands in a graceful curve to 12 in wide to provide stabilization feet and enhance the horn output. It actually sounds really good. After testing it by pulling driver from my Cornu spiral, I now must order more Vifa's. It is a fun build and can be done in an evening and a morning as one has to wait for glue to dry.

Foam Core Board Speaker Enclosures?
You should try Gatorboard instead of FoamCore -- far more rigid exterior, cut with a high TPI saw blade. I think it is some kind of ceramic exterior. Still lightweight, cheap, quick prototyping. I used to build temporary project boxes with it.
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Old 7th January 2013, 05:27 PM   #2302
xrk971 is offline xrk971  United States
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Quote:
Originally Posted by tommy_o View Post
You should try Gatorboard instead of FoamCore -- far more rigid exterior, cut with a high TPI saw blade. I think it is some kind of ceramic exterior. Still lightweight, cheap, quick prototyping. I used to build temporary project boxes with it.
We have discussed this topic early on in Foam Core thread. Nice stuff but far from cheap: $20 for a single 32 x 40 in board - even more expensive than birch plywood! Also, needs a saw and cannot be cut with a razor on your kitchen table. $20 was the total budget for the foam core FH3-inspired speaker including driver.

32 x 40" White Gator Board S-13738 - Uline

Last edited by xrk971; 7th January 2013 at 05:31 PM.
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Old 9th January 2013, 02:04 PM   #2303
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Originally Posted by xrk971 View Post
I just finished one horn inspired by the FH3.Foam Core Board Speaker Enclosures?
What a truely elegant solution to a horn loudspeaker
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Old 9th January 2013, 02:06 PM   #2304
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xrk971 Would it be of any benefit to also curve the back wall of the loudspeaker too? I don't know anything about horns so ignore if this is a stupid comment.
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Old 9th January 2013, 02:24 PM   #2305
xrk971 is offline xrk971  United States
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Originally Posted by smallangryboy View Post
xrk971 Would it be of any benefit to also curve the back wall of the loudspeaker too? I don't know anything about horns so ignore if this is a stupid comment.
Thanks for the kind words - all I did was add the curved wings and make it a bit smaller. The elegance of the design was already there from original.

With the foam core, you can curve anything you like I have actually thought about this and in order to preserve the cross sectional areas, the divider, back and front wall will have to curve together - the thing will look like a sculpture - I would say it reminds me of a spinnaker sail on a boat. This will cause the driver to aim up too much so maybe curve it back at the top to keep same angle of driver vs room floor. What is interesting about how light this speaker is that it allowed me to flip it upside down, face the horn to the front, place on a tall stool and it actually sounds pretty good - with the horn output now directly facing the listener rather than reflected off the back wall. It looks kind of like a flower of some sort when flipped upside down.
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Old 17th January 2013, 03:12 AM   #2306
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Default Fostex FE208 Sigma

Inside dimensions are 8.25'' W by 11.25'' D by 38'' H. Vent diameter is 3.5'' and is 3'' deep. I used 2x12 pine with 0.25'' birch veneer on top, front and two sides. This is how it happened: I had bought a pair of speaker boxes to try out other drivers and then I thought “why not try out Sigmas too?”... I did and immediately liked what I heard. Then I decided to build new boxes from scratch. What you see is the result. Totally unscientific approach but I care not since the final result is very much to my aural liking...
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File Type: jpg fostex-fe208-sigma 032.jpg (227.3 KB, 1753 views)
File Type: jpg fostex-fe208-sigma 033.jpg (301.1 KB, 1706 views)

Last edited by fullrangeSR; 17th January 2013 at 03:16 AM.
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Old 19th January 2013, 02:43 PM   #2307
JLG46 is offline JLG46  United States
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Does are some beautiful looking speakers! I want to build them!!!!
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Old 21st January 2013, 09:20 PM   #2308
toobhed is offline toobhed  United States
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Default uFonken FF85k

I bought 5 unfinished cabinets together with 5 FF85k's from a member who had planned a 5.1 system about a year or two ago. The FF85k's spent about a year in school office breaking every weekday and I guess they had 300 - 600 hours under their belt before being mounted on the uFonkens.

As they arrived to me pre-constructed I decided to stuff instead of line...quite difficult getting hands inside of the driver cutout. I used a .25" radius to round the baffle edges and filled/sanded the cabs to prep for veneer. The bubinga burl paper-backed ended up very easy to cut and wrap around the baffle radius...far easier than other veneers I've used.

These little gems do have some low end considering their tiny size but could definitely use help below 250ish hz for real "full range" listening. The mids image great but to my ears the high end is a bit hot with digital material or ss amps.

I plan to use the newer Fostex FF85wk (grayish/bluish drivers) on the next two but I may need to consider altering the vent.

Mario
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File Type: jpg P1210180.jpg (731.1 KB, 1311 views)
File Type: jpg P1210183.jpg (739.8 KB, 1224 views)
File Type: jpg P1210185.jpg (676.6 KB, 296 views)
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Old 21st January 2013, 10:03 PM   #2309
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Quote:
Originally Posted by toobhed View Post
The mids image great but to my ears the high end is a bit hot with digital material or ss amps.

I plan to use the newer Fostex FF85wk (grayish/bluish drivers) on the next two but I may need to consider altering the vent.
Mario,

Usually takes bat ears to notice the rise above 15k on the FF85k, a little off axis helps. The FF85wk gives up a bit on the top (25k vrs 32 k) for a smoother top end, and is an overall better performer. The vent mod is fairly easy to retrofit, and tunes the box a bit lower.

dave
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Old 21st January 2013, 10:35 PM   #2310
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Toobhed:nice timber.
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