By permission of Dr. Bruce Edgar and Audio Amateur Corporation, I’m very happy to have these valuable articles available for download. Without a doubt, they are a ‘must-read’ for everybody being interested in horn-loudspeaker design.
The Edgar Midrange Horn
Single file, all pages, PDF, 9.6MB
Reprinted, with permission, from Dr. Bruce Edgar and Speaker Builder, Issue 1, 1986, p.p. 7-17, of Speaker Builder magazine.
© Copyright 1986 by Audio Amateur Corporation. P.O. Box 876, Peterborough, NH 03458, USA. All rights reserved.
The Show Horn
Single file, all pages, PDF, 11.9MB
Reprinted, with permission, from Speaker Builder, Issue 2, 1990, p.p. 10-12, 14, 16-20, 22-23, 75, of Speaker Builder magazine.
© Copyright 1990 by Audio Amateur Corporation. P.O. Box 876, Peterborough, NH 03458, USA. All rights reserved.
The Monolith Horn
Single file, all pages, PDF, 6.9MB
Reprinted, with permission, from Dr. Bruce Edgar and Speaker Builder, Issue 6, 1993, p.p.12-14, 16, 18, 24-25, of Speaker Builder magazine.
© Copyright 1993 by Audio Amateur Corporation. P.O. Box 876, Peterborough, NH 03458, USA. All rights reserved.
The Edgar Interview
Edgar Interview, PDF, 330KB
An interview that “Audio Minister Plenipotentiary” Dave Glackin did with Dr. Bruce Edgar. Even though it’s pretty dated it’s also a must read.
What is Q?
What is Q, PDF, 36KB
An explanation by Dick Pierce from a posting of his posting on AA.
The Dinstale Horn Loudspeaker Design Articles
Three articles summarizing the development of the design theories and concluded with two systems for construction by J. Dinsdale.
Reprinted from Wireless World, March 1974.
Also an interesting article to read which is being referred to very often. However, as Dr. Bruce Edgar already pointed out on AA, it’s loaded with wrong headed ideas. He wrote me that he will perhaps write an critique which I will add here.
Here is the link to his posting on AA. Or read this quotation:
The first wrong assumption is the use of any old driver in a horn. He used KEF drivers which are mass loaded. If you place these drivers on a horn, you lose bandwidth. Notice that he does not present any frequency response plots. The second wrong assumption is the design of a Tractrix bass horn. It’s an contradiction in terms. You can’t get bass out of a Tractrix design. The third wrong assumption is bad things happen at the flare cutoff so Dinsdale says to back off by 20% the flare frequency. Some software out there uses this assumption. You plug in a frequency but you end up with a horn of lower flare frequency (20% below) that is longer than you need. But even worse, the mouth size is calculated for the input frequency, not the lower value. So the end result is a lower flare rate and a longer horn than you need with a too small a mouth. I always do my own horn flare calculation.
Horn Loudspeaker Design Part 1, PDF, 881KB
“Horn Loudspeaker Design”, by J. Dinsdale
Reprinted from Wireless World, Mar 1974, pp. 19-24.
© Copyright GM Media Corp., 5201 Blue Lagoon Drive, Miami, FL 33126, USA. All rights reserved.
Horn Loudspeaker Design Part 2, PDF, 1426KB
“Horn Loudspeaker Design – Part 2”, by J. Dinsdale
Reprinted from Wireless World, May 1974, pp. 133-138.
© Copyright GM Media Corp., 5201 Blue Lagoon Drive, Miami, FL 33126, USA. All rights reserved.
Horn Loudspeaker Design Part 3, PDF, 971KB
“Horn Loudspeaker Design – Part 3”, by J. Dinsdale
Reprinted from Wireless World, Jun 1974, pp. 186-190.
© Copyright GM Media Corp., 5201 Blue Lagoon Drive, Miami, FL 33126, USA. All rights reserved.