Measurements taken expecting one type of design will not reflect the results the user might perceive with a vastly different type of design.
If measurements do not tell the entire story here, the efficiency comparison of the various types of speaker systems would be valuable information. Xeno, I hope this is not another thread you and jj intend to destroy just for your own jollies.
The exclamation point would indicate you are making a statement about yourself. Possibly, you could find a professional to assist you with this problem, Xeno. I should think it would be a horrible existence to be you. Unfortunately, I have never had a chance to hear Dr. Geddes' speakers, although I understand they are very good, and sound fine even driven by a cheap Pioneer receiver they are quite sensitive. Search form Search. Log in or register to post comments. March 10, - am.
Last seen: 10 years 6 months ago. Joined: Oct 18 - am. Why Horns? Last seen: Never ago. Joined: Nov 1 - am. Re: Why Horns? Last seen: 15 hours 58 min ago. Joined: Apr 4 - am. Jan Vigne. Joined: Mar 18 - pm. You are absolutely right; wrong word; I meant sensitivity. Quote: Of course the horn itself is the bass unit Last seen: 10 years 3 weeks ago. Joined: Sep 8 - am. I use a couple of horn based speakers.
Likes: Good 'speed. At the right frequencies, exquisite detail. Maybe abherent, but I like it. Have been easy to drive. Good low level detail. Cons: There can be a frequency for a given horn where the emphasis can be just too much.
March 10, - pm. March 11, - pm. March 13, - am. Last seen: 1 month 1 week ago. Joined: Jun 16 - pm. Joined: Nov 28 - am. Quote: The size of a true horn speaker for the low end has a huge opening and a huge length.
Quote: Quote: The size of a true horn speaker for the low end has a huge opening and a huge length. March 13, - pm. Quote: Have you ever used horns, JS? Quote: One horn speaker I did enjoy, and again I've forgotten the brand name - had the horn made out of transparent acrylic with a chrome tubular metal frame holding them up with a single 'full range' driver and a separate normal dynamic sub-woofer to fill in the bottom end.
March 14, - am. Quote: these? Quote: Oh yea, the time alignment issue requires that the drivers are in alignment,not the fronts of the horns. March 16, - am. May 1, - pm. Pete B. Last seen: 6 years 10 months ago. Joined: Jul 21 - am. May 2, - am. Last seen: 9 years 10 months ago. Joined: Dec 13 - pm. OK Hands uo who knows what an acoustic transformer is? Because of the gradual change of the diameter of a horn, the source of sound at the throat engages all the air in a horn.
We can think of a horn as having an imaginary, massless diaphragm at the mouth. There may appear to be an unreal quality about the action of a horn in that it seems to get something for nothing, making a soft sound into a loud one.
A horn is purely a passive device, and does not inject additional energy into the system. But the reason that a horn is able to increase the radiation of sound from a given source so dramatically by factors of 10 or more is that most sources of sound have only a very poor bite on the surrounding air, and do not succeed in changing much of the mechanical energy into acoustical energy.
The horn allows the mechanical power capabilities of the source to be tapped much more efficiently. A new book on loudspeaker theory by Earl Geddes contains a chapter on waveguides part of horn theory. Geddes' waveguide theories lead him to question the common Webster equations for horns. Murray describes how the increased efficiency and bandwidth of modern compression drivers has resulted in changing priorities in horn design.
No longer do you need the most efficient horn possible for impedance transformation, now you can concentrate on developing "waveguides" which control the dispersion of the wavefront. The idea is to get better polar distribution patterns at the expense of some efficiency.
However Murray's paper gives no mention to the inventor of the waveguide approach, Earl Geddes also in the references section. These new theories develop a waveguide that starts with a curved contour which then develops into a conical horn.
I believe the idea is to get suitable matching from a vibrating plane source the diaphragm in the curved throat, which then develops into a conical horn which guides the waves towards the listener with minimal distortion. It looks like some PA applications might be using these waveguide theories, but so far the horn Hi-Fi crowd haven't tried them.
Most successful front horns are still based on the Tractrix contour, see for example Bruce Edgar's Edgarhorn Loudspeakers and Sierra Brooks. Horn loudspeaker system is the oldest design in sound reproduction. Even till today, it is the least known design in the sound industry. Most of us audiophiles don't really know what goes on behind that protruding horn that emits sound so effortlessly.
It started more than a hundred years ago, when Emil Berliner presented his gramophone to the public for the first time. The horn of the gramophone amplified the mechanical oscillations of a pin running along a groove in a disc producing a sound that could be heard by the human ear.
Common knowledge tells us that horns are transforming pressure by using a sound source, which means a driver. Thus they work in principle the opposite to a human ear.
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