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Horn tuned for 22Hz from the 1980's
Horn tuned for 22Hz from the 1980's
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Old 22nd July 2021, 06:13 PM   #11
planet10 is online now planet10  Canada
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Horn tuned for 22Hz from the 1980's
Quote:
Originally Posted by norman bates View Post
86" wide mouth x 38" tall mouth x 31" deep
Which suggests the size of the mouth is good to 58 Hz, floor loaded, half that.

Doesn’t say the resyt of the horn matches.

dave
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Old 22nd July 2021, 07:08 PM   #12
bentoronto is offline bentoronto  Canada
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Horn tuned for 22Hz from the 1980's
Quote:
Originally Posted by weltersys View Post
...Although it's horn path length is not long enough to support a 22 Hz Fc, the output below Fc will be similar to that of the drivers in a sealed enclosure with volume the same as the compression chamber, which would extend to 22Hz without the sensitivity provided by the exponential horn.

Art
Art, you are (as usual) perfectly right in what you say. But in practice, the driver in the little sealed box will be resonating at maybe 60 Hz - once the horn-effect lets go. That's why horns are wonderful in their design range and a curse outside of it.

It ain't "sensitivity", it's "impedance matching" that produces the horn-effect.

B.
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Old 22nd July 2021, 10:49 PM   #13
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Quote:
Originally Posted by planet10 View Post
Which suggests the size of the mouth is good to 58 Hz, floor loaded, half that.
Hmm, C = 2*[86+38] = 248" = ~13543/248 = 54.61 Hz

[248/2]*pi = ~39.47" radius * 0.613 pipe end correction = ~24.2" + 248" = 272.2" eff. C

~13543/272.2 = ~ 49.75 Hz, meeting the Shearer Horn's 50 Hz low corner design spec.

Floor mirror image [2pi space] drops it a half octave = 0.707*50 = ~35 Hz.
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Old 22nd July 2021, 11:07 PM   #14
bentoronto is offline bentoronto  Canada
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Horn tuned for 22Hz from the 1980's
Hmm, how do you get both ends of the horn on the floor?

Obvious critique apart, if the elaborate big corner horn with many twists and turns inside and using the two walls as extensions of the horn barely scrapes by at 35 Hz, that sure doesn't look like a 35 Hz horn.

Kind of resembles something Klipsch brought out a long time ago as a sop to the impecunious.

B.
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Old 22nd July 2021, 11:47 PM   #15
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Lay it on its side like they did. Not that it matters, mirror image is mirror image, just its polar response changes.

What corner horn? this was a cinema horn: Technical Bulletin, Volume 1936 March 3, 1936 (Shearer).pdf - Google Drive
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Old 23rd July 2021, 12:25 AM   #16
bentoronto is offline bentoronto  Canada
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Horn tuned for 22Hz from the 1980's
Thanks for vintage link. Dunno how much to trust their curves - likely some "assumptions" went into plots. Nothing plotted south of 50 Hz.

Horn physics likely goes back a long way. But bass in movies couldn't have been much in 1936. Today, lots of folks (in the cars at stop lights next to me) think a loud guitar at 80 Hz is great bass.

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Last edited by bentoronto; 23rd July 2021 at 12:28 AM.
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Old 23rd July 2021, 01:04 AM   #17
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You're welcome!

Hmm, TTBOMK based on numerous W.E. ones I've seen, it's a 'smoothed' drawing of a measured response and yes, at that point films didn't go that low, but as late as 2013 'flat to 50 Hz' was still the standard curve, so apparently took the 'long view' from the beginning.
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