from the 1955 Audio Anthology reprint of the original article. (and a very clean looking issue)
Norman C. Fulmer had already published an article (and patent) for an enclosure with tapered terminus.
This article borrows part of Karlson's 15 aperture for the tapered slot exit.
Subjectively the builder seemed pleased 😀
It appears to be tuned about center of the EV SP12B speaker's resonance.
I wonder how its response would really look.
Norman C. Fulmer had already published an article (and patent) for an enclosure with tapered terminus.
This article borrows part of Karlson's 15 aperture for the tapered slot exit.
Subjectively the builder seemed pleased 😀
It appears to be tuned about center of the EV SP12B speaker's resonance.
I wonder how its response would really look.
Attachments
That looks to me like a transmission line, around 60Hz fundamental resonance. The form of the opening won't have much influence.
A high Qts driver is needed.
A high Qts driver is needed.
The much later SP12 ("C") in this case was spec-ed at Qts = 0.67. My Fane 12-250TC when new had qts ~0.8 and fs ~67Hz.
https://community.klipsch.com/uploads/monthly_10_2013/post-2552-1381925770331.gif
https://community.klipsch.com/uploads/monthly_10_2013/post-2552-1381925770331.gif
What modern drivers would work? Is this a full range can or just a low or band pass speaker cab ?
since its rear load and direct radiator, there would be no more effect upon the highs than a reflex box. I don't have access to hornresp - maybe GM oe aomw other handy soul would do a sim with a couple of the following
Fane12-250TC, Eminence 12LTA, Celestion K12H-100TC, Celestion K12H-200TC Eminence Beta 12CX, Eminence B102, Nirvana 10 inch, etc.
There's less than 2 cubic foot airspace - a Karlson K12 has about 1.3 cubic foot rear chamber - both appear to be tuned in the low 60's.
Snugged into a corner, the Bates pipe would take up very little space - and might even work well.
(my Karlson K12, depending upon driver, can do some things better than my Klipschorn !- do not be afraid of Karlson or Karlsonator when loaded with appropriate drivers - - run for the hills if a K12 is loaded with a GRS BOFU knockoff. 🙂)
Fane12-250TC, Eminence 12LTA, Celestion K12H-100TC, Celestion K12H-200TC Eminence Beta 12CX, Eminence B102, Nirvana 10 inch, etc.
There's less than 2 cubic foot airspace - a Karlson K12 has about 1.3 cubic foot rear chamber - both appear to be tuned in the low 60's.
Snugged into a corner, the Bates pipe would take up very little space - and might even work well.
(my Karlson K12, depending upon driver, can do some things better than my Klipschorn !- do not be afraid of Karlson or Karlsonator when loaded with appropriate drivers - - run for the hills if a K12 is loaded with a GRS BOFU knockoff. 🙂)
yeah - Art "Weltersys" uses a Keystone shaped terminus in his tapped horn.
Here's Norman C. Fulmer's patent page 2. and link to the patent's PDF
https://patentimages.storage.googleapis.com/28/b4/ee/1278f2d1c7fe23/US2787332.pdf
Here's Norman C. Fulmer's patent page 2. and link to the patent's PDF
https://patentimages.storage.googleapis.com/28/b4/ee/1278f2d1c7fe23/US2787332.pdf
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Don't have the program, sims anymore, but you may recall that when you showed it to me I did a quickie sim with MJK's program and it seemed to be designed specifically for my ~two decades later Altec 421-8H specs. Now all I got to do is see if I still have them as they were a bit different from these: Altec Thiele-Small Parameters
GM
Hi GM
I pulled that plan just now from the Nov, 1951 Radio and Televsion News article
Its just about a constant cross sectional area pipe (?)
I pulled that plan just now from the Nov, 1951 Radio and Televsion News article
Its just about a constant cross sectional area pipe (?)
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Hmm, my memory caught me out yet again 🙁! In retrospect it wasn't Bates, but Norman C. Fulmer's, 'A Corner Labyrinth Transducer' (Scans: p 1 2 3 4) in Radio & Television News: The Karlson Homepage
GM
GM
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Bummer. 🙁 It looks good enough, but not nearly as magazine quality [smooth] as the other, though imagine it's too big? to post here. Regardless, yours blows up bigger for me, so prefer it.
GM
GM
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IIRC I scanned that one at Ulfman's forum. Not all of American Radio HIstory's scans look good. I'm real queasy tonight - can't kick a stomach bug - need an operation too. Old age kinda sucks 😱
'Kinda'?! 'Knock on wood', stomach problems has somehow managed to evade me even though my eating habits over the decades implies I should have had most of it removed by now. Lifelong respiratory ailments has/is the bane of my existence, though surprised Covid hasn't gotten me [yet] when I've been out shopping, eating at restaurants as soon as they reopened, then quickly shut down again due to one or more workers getting sick.