Hi,
I would like to know if the concept of the JBL Paragon diffusion board has ever been applied to fullrange speakers, and if so with any benefit.
https://en.wikipedia.org/wiki/JBL_Paragon
Thank you in advance
I would like to know if the concept of the JBL Paragon diffusion board has ever been applied to fullrange speakers, and if so with any benefit.
https://en.wikipedia.org/wiki/JBL_Paragon
Thank you in advance
It has been done🙂 https://www.diyaudio.com/community/threads/thoughts-about-single-box-stereo.383290/post-6967934
I also have such a box on my project list. I imagine it to look like a Lemus Audio stereo console.
I also have such a box on my project list. I imagine it to look like a Lemus Audio stereo console.
Nice! Thank you pelanj!
Will they only be 1,2 meters long?
Will a plastic curved surface help to perform tests to extend the listenable area?
Will they only be 1,2 meters long?
Will a plastic curved surface help to perform tests to extend the listenable area?
It is more a question for @danb11 - my trial setup will be a bit larger - using two way speakers and a temporary curved baffle. If you look through the thread, there is maybe a link to another build - a guy built a paragon-like loudspeaker with Fostex drivers - or maybe it was a youtube video?
One more edit🙂 I found this:
But there was also a smaller one sealed and not BLH.
Edit, again. This is the video I was talking about.
Not really following the principle, but definitely inspired by the Paragon.
One more edit🙂 I found this:
But there was also a smaller one sealed and not BLH.
Edit, again. This is the video I was talking about.
Not really following the principle, but definitely inspired by the Paragon.
Last edited by a moderator:
I write here not to hijack the other thread. Yesterday evening I converted the diagram that can be found online (here: https://www.coastalvectors.com/blog/wp-content/uploads/2012/02/Paragon-Diagram1.jpg ) in dwg to be able to see some more specs.
Not very interested in the inside of the speaker, rather on the front side.
I've read that the original one needed to be lifted around 40-50cm from the floor to perform its best. I think it is due to the fact that mid-horns are diffusing horizontally into the curved baffle, but not so much vertically. A full range speaker should diffuse more on the vertical plane, so the curved baffle has to be more extended vertically as well.
Is it correct? Is there anyone who tried something similar?
Not very interested in the inside of the speaker, rather on the front side.
I've read that the original one needed to be lifted around 40-50cm from the floor to perform its best. I think it is due to the fact that mid-horns are diffusing horizontally into the curved baffle, but not so much vertically. A full range speaker should diffuse more on the vertical plane, so the curved baffle has to be more extended vertically as well.
Is it correct? Is there anyone who tried something similar?
JBL did a system similar to what I had in mind:
https://stereonomono.blogspot.com/2013/02/jbl-ranger-metregon-c45.html
![metregon+dis[1].jpg](https://www.diyaudio.com/community/attachments/metregon-dis-1-jpg.1053180/ "metregon+dis[1].jpg")
![page25[1].jpg](https://www.diyaudio.com/community/attachments/page25-1-jpg.1053181/ "page25[1].jpg")
https://stereonomono.blogspot.com/2013/02/jbl-ranger-metregon-c45.html
Or check out the Minigon - I think one of the versions used just a pair of full range drivers.
http://www.lansingheritage.org/images/jbl/catalogs/1962/page20-21.jpg
http://www.lansingheritage.org/images/jbl/catalogs/1962/page20-21.jpg
Freddi did some experimenting with JBL 'cheese grater' type lens ages ago IIRC, so maybe he'll chime in.
@GM @planet10 , you are both reluctant to this kind of speaker.
Is it because of the trade-off of timing of the signal (your ears will receive two signals that percurred different distancies, so they are not as they were recorded, plus left and right could come to you swapped, plus phase cancellation) vs wider stereo-feeling area?
Is it because of the trade-off of timing of the signal (your ears will receive two signals that percurred different distancies, so they are not as they were recorded, plus left and right could come to you swapped, plus phase cancellation) vs wider stereo-feeling area?
.
From my own perspective based on what I've read, the curve acts as an acoustic lens. The key being that it offers a steady 180 degree stereo field. Each driver cannot see the other (blocked by the lens) and as you move to one side the opposing driver becomes more direct, thus you get the direct as well the near reflection and keep a steady stereo field. It's a 1950's idea so it isn't going to be perfect, but some of wanted to try to build something for a stereo "illusion" in really awkward rooms and thought it might be an interesting approach.
From a quick experiment with no measurement, imo it works. BUT I'm under no illusions it's not meant to replace good stereo triangle in a good room.
From my own perspective based on what I've read, the curve acts as an acoustic lens. The key being that it offers a steady 180 degree stereo field. Each driver cannot see the other (blocked by the lens) and as you move to one side the opposing driver becomes more direct, thus you get the direct as well the near reflection and keep a steady stereo field. It's a 1950's idea so it isn't going to be perfect, but some of wanted to try to build something for a stereo "illusion" in really awkward rooms and thought it might be an interesting approach.
From a quick experiment with no measurement, imo it works. BUT I'm under no illusions it's not meant to replace good stereo triangle in a good room.