GoodSoundClub - Romy the Cat's Audio Site

In the Forum: Horn-Loaded Speakers
In the Thread: Tractrix Bass horn vs Spherical Wave Horn - Bass loading

Post Subject: Tip #1.Posted by Romy the Cat on: 7/5/2015

Blaukopf wrote:
Hello Romy, thank you for the answers. Your horns have a round mouth, but their profile is not spherical. That is the profile of the Avantgarde Horns you formely had - apparentyl you have anayzed them intensively, could you elaborate what problems you found ? Kugelwelle = Spherical Wave profile invented by Klangfilm-Siemens. Not Tractrix, on Wikipedia it is also wrong.

Mark, I do not want to be involved into discussion of what is a true Spherical horn. There is some controversy in there but not on the level you cover the subject. When Klangfilm introduced own profile they did claimed that they have true spherical diffusion but it is only because no one did at that time Tratrix commercially. BTW, even though the Klangfilm profile was “better” from spherical perspective but they never got any spherical results as they did only rectangular horns that are not able to do spherical waves. Anyhow, in my langue when I say that I use spherical horns I mean that I use round short horns. How it complies with Wikipedia I do not care.

Blaukopf wrote:
If you use the excel sheet by volvotreter, for a tractrix horn of 80 Hz cutoff the usable frequency starts at 170 Hz, lenght is 93 cm.

I do not accept the premises of the question. What do you mean: the 80Hz horn with usable frequency starts at 170 Hz? It is not MF horn but upper bass horn and it usable frequency shall not be too far from the horn rate. Also, tractrix horn of 80 Hz, what is it? A tip #1: never think about a horn without a context of the rest of the channels.

Blaukopf wrote:
looking at a horn by JLH it seems that he has added a long tube at the throat - is this to increase bass-loading

Nope, there was nothing was added. It is very straight forward tratrix horn of 38” mouth with very classic profile.

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