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Old 18th March 2011, 04:28 PM   #11
chrisb is offline chrisb  Canada
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Regarding Ron Clarke's (family of ) horns - unlike Scott's designs, I've only built/heard one of Rons - the Austin for FE126.

For those interested in theories of operation, others here can explain in engineering terms, but all that I needed to understand was revealed in the listening. These are a great sounding speaker - my domestic situation simply precludes any of the larger horn enclosures (front or rear mouthed), or for that matter conventional bipoles, OBs etc.
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Old 18th March 2011, 04:43 PM   #12
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Yep, Ron's are fantastic boxes, some of the best out there for widebanders IMO Just goes to show -no one solution to anything.
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Old 18th March 2011, 05:48 PM   #13
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Quote:
Originally Posted by Scottmoose View Post
I don't know if the C horns have a high reputation
The plans for the C Horn have never been released (so no builds independent of the designers). The only reputation is largely that some people really like what i think are its garish looks. The only comments on sonics i've seen are by the maker.

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Old 20th March 2011, 10:01 AM   #14
DrBoar is offline DrBoar  Sweden
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Bending of pipes is tricky. If we imagine a 100 Hz (positive) pressure wave is migrating down a tube the distance from the start to the crest (pressure maxima) is 0.85m. Such a pressure zone will pressurize quite large bends and go uninpeded around the bends. At 500 Hz the distance is ony 0.17m and then it is quite comparable in size i with many bends. So what is good in a subwoofer horn below 80 Hz may not work in a horn that is used up to 200-500 Hz.

If we look at BLHs like the Jericho and use 90 degree bends as units ( one 180 degree = two 90 degree) it has five 90 degree bends and some TLS like the Atkins mini has no less than ten 90 degree bends. The textbooks tells us that as long as the soundwave is much longer than the radius of the bend losses are negligible. OK then how big is "much" and little is "negligible"?? If the complicated pipe is used to increase radiation resistance for the driver losing 0.5 dB in a bend might be classified as "negligible" but if you have 5 or 10 of those bends and lose 2.5 or 5 dB it is anyting but "negligible".

So I try to always use corner reflectors and rounded inner corners. The reflectors will work as braces and should not be harmful in any setting allmost. If it bend radial reflectors, 45 degree radial reflectors or Heugen reflectors should matter less.
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Old 20th March 2011, 01:35 PM   #15
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Depends on the specific design in question regarding the 'how much' & 'negligable' parts. Personally, I generally avoid reflectors (with certain exceptions) in back-loaded designs as I use the bends as a functional part of the low pass filter.

Last edited by Scottmoose; 20th March 2011 at 01:37 PM.
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Old 16th August 2011, 12:11 PM   #16
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Quote:
Originally Posted by DrBoar View Post
Bending of pipes is tricky. If we imagine a 100 Hz (positive) pressure wave is migrating down a tube the distance from the start to the crest (pressure maxima) is 0.85m. Such a pressure zone will pressurize quite large bends and go uninpeded around the bends. At 500 Hz the distance is ony 0.17m and then it is quite comparable in size i with many bends. So what is good in a subwoofer horn below 80 Hz may not work in a horn that is used up to 200-500 Hz.

If we look at BLHs like the Jericho and use 90 degree bends as units ( one 180 degree = two 90 degree) it has five 90 degree bends and some TLS like the Atkins mini has no less than ten 90 degree bends. The textbooks tells us that as long as the soundwave is much longer than the radius of the bend losses are negligible. OK then how big is "much" and little is "negligible"?? If the complicated pipe is used to increase radiation resistance for the driver losing 0.5 dB in a bend might be classified as "negligible" but if you have 5 or 10 of those bends and lose 2.5 or 5 dB it is anyting but "negligible".

So I try to always use corner reflectors and rounded inner corners. The reflectors will work as braces and should not be harmful in any setting allmost. If it bend radial reflectors, 45 degree radial reflectors or Heugen reflectors should matter less.
Yeah, Bruce Edgar talked about this in his Show Horn article. If you want the higher frequencies out of a folded horn, then the 45 degree reflectors are required.
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