The 2397 data sheet says "recommended cylindrical baffle at least 3 inches above and below the mouth." I haven't seen any discussion here of such a baffle, I've only read of this horn being used in a free-standing configuration or mounted on a flat baffle. Would this horn benefit from a cylidrical baffle?
I have wondered about that too. I assumed it was meant as a recommendation to somehow maximize vertical dispersion.
That combined with aesthetics is why I made my 2397 clones a bit taller. When I mocked them up digitally I found 3" looked butt ugly so I blew that off.
I believe the primary difference is improved vertical dispersion. A problem that I didn't feel needed fixing as I am a "sweet spot" listener. Stupidly I never compared my 2397 clones with the real deal in regards to vertical dispersion.
Widget
Our task is to assist Mr. Widget in rediscovering the unique pleasures of constant directivity.Originally Posted by Mr. Widget
Jim
I have also been wondering about that. I note that a lot of 2397 installations including some I have seen here appear to have the 2397 built into a flat baffle with the curved part sticking out like a pair of lips (eg like the one Ken Pachkowsky uses as his signature pic). Is this what JBL meant by a "recommended cylindrical baffle at least 3 inches above and below the mouth." or did they truly mean a cylindrical baffle? I have never seen a pic of such a beast.
Regards
Ted
Nice horns Widget.
Ian
They mean something like this.
Here is a shot of 2397 horns in an installation that the original designer of the horn is using. I would guess he knows how to get the most out of them.Actually he does... he gave me a couple of pointers which did prove useful.
Widget
Look this,
What were the pointers?
I can't give away all the secrets.
There wasn't a one size fits all, do this and the horn is better solution. If it were that simple we'd change it and market it.
Widget
Ted,
I went through an exercise a while back in a thread I started called
Gone are the 'gons, but why?
In this I showed a concept of a 2397 mated with a metregon-like cylinder which I thought was really cool. It was for a center HT speaker, which I dubbed the "Centregon". A comment was made that I should turn it upside down, but the reviewer didn't understand that I was trying to make a system to fit on the top of a large RPTV, so I needed the horn at the bottom. He sent back an upside down image of my front drawing. I think this would be a wonderful solution for the case where the center would be mounted under the TV display.
Someday I may construct this concept when I change TVs. Meanwhile, there is not enough room above my RPTV sice my back wall slants forward 45 deg. starting 6" above the TV and I could not fit the design into that constraint. My current "Centreflex" design will, and is modular so that I can at least try out a 2397, though probably with less than 3" high lips. I expect to post my centreflex in a few days on a new thread.
John Y.
Cool!!!
Widget
Isn`t it, that a horn has a lower cutoff and a smoother response with a baffle ?
Eckhard
Ich hab alle Fehler gemacht ! (Marius Müller Westernhagen). = Made all mistakes!
Time is running out. Only five minutes.
Eckhard
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