August 8th, 2016, 10:44 am
August 8th, 2016, 11:03 am
August 8th, 2016, 1:08 pm
August 8th, 2016, 3:01 pm
Roscoe Primrose wrote:I think you're missing the point. Exponential horns are a fine thing. The 511 departs from being an exponential horn in the throat area. That's not opinion or hearsay, that's plain measurable geometry. No amount of damping can change that.
Roscoe
August 8th, 2016, 3:39 pm
Cogito wrote:Roscoe Primrose wrote:I think you're missing the point. Exponential horns are a fine thing. The 511 departs from being an exponential horn in the throat area. That's not opinion or hearsay, that's plain measurable geometry. No amount of damping can change that.
Roscoe
That sudden transition in the throat area seems to be a design feature, not a flaw.
Here is the excerpt from Altec literature:
511B/811B:
Exponential expansion and straight throat configuration ensure uniform control of the sound dispersion pattern -- 90 degrees horizontal by 40 degrees vertical -- and exacting reproduction of the middle and high frequencies.
http://alteclansingunofficial.nlenet.net/proloudspeakers/sectoralhorns/511B&811B-Data.pdf
August 8th, 2016, 3:51 pm
Pooge wrote:It was design back then as a way to get a uniform desired radiation pattern. However, it's also a diffraction horn and all that entails. That's considered a flaw against sound quality.
August 8th, 2016, 4:09 pm
August 8th, 2016, 4:42 pm
Pooge wrote:It was design back then as a way to get a uniform desired radiation pattern. However, it's also a diffraction horn and all that entails. That's considered a flaw against sound quality.
A characteristic feature of the sectoral horns is a beam width in the horizontal plane that is constant through the middle and high frequency range. Other horn types (except the multicellular horns) passes beams that become progressively sharper as the frequency increases, and generally cover a narrow area at the high frequencies.
August 8th, 2016, 4:58 pm
August 8th, 2016, 5:09 pm