1200Hz Smith horns for 1" driver

[yggdrasil]

It is almost straight. Just a 3-4 mm flare. I made it on free hand, just to smoothen the transition into the horn. You might be able to see it if you look closely at the picture.

[bbrown]

A straight bore would certainly make them a lot easier to make. And to think that all this time I've been trying to figure out how to make Widget's throat adapter.

Bruce

[Mr. Widget]

And to think that all this time I've been trying to figure out how to make Widget's throat adapter.

The throat adapter seems to have the greatest effect at the lower end of the horn's band. I guess since Westlake crosses their 26" wide 2" horn over at the relatively high 1200Hz frequency, it doesn't matter.

As far as Johnny's small 1200Hz horn, I have yet to play with these, so I'd suggest we follow his lead.

It does look promising.


Widget

[yggdrasil]

I have been playing a few hours on them now. Sorry to admit that the electronics is rather poor. Since my wife occupies my good amps and cd-player on the Sovereign's I have a very low cost DVD/CD player with a variable output directly connected to a Crown 460 CSL.


When the program material gets complicated the CD-player just says thank you and good night.... Have started looking around for a usable CD-player. I haven't been paying any attention to this market for years, so there is a job to do.

If, on the other hand, the program material contains less information....

The horns play very well. I have not yet grown accustomed to the improved HF extension.

I have a 2-seat couch, with the sweet spot in the middle. For the first time it is possible to sit anywhere in the couch.

I have a second 2425 on the way. Snail mail from US, 4-6 weeks++, should be here in a couple of weeks. Will do a subjective comparison with LE85 later.

[DR Carlson]

I've been going over the varous posts concerning the Smith horn, and I'm interested in building some. The problem I am coming up against, is getting enough info to design then build one properly.
I have down loaded the 1951 artcle from Audio Engeering written by Bob Smith, but it is not the best copy, on page 17 figure 5 there seems to be a triangler plug right at the mouth of the horn spaced 5/16" in front of the back plate. Can anyone enlighten me.
Also is it possible for anyone who has design/construction info on these, Perhaps other magazine articules etc to be able and send them to me. I can take most formates including DWG DXF, JPG etc.

Thanks Dave C.

[yggdrasil]

I tried redrawing the original Bob Smith drawing using his calculations, drawing and a CAD-program. There were some errors in my calculations. I got quite close but...


However - the triangular drawing in the horn throat shows the origo (circle centre) and the angles of the 5 vanes / islands.

Anyway the drawings presented in this thread are built on JBL's work on the 2397 horn. I have not tried to make any horn following Bob Smith's design 100%.