The cone is actually a lot smaller than 8" the compression ration is typical for a front loaded expo horn, There is no front chamber just an initial flare of negative 10 degrees for 3.5". The negative throat smoothed out a peak I had at 150 hz and extended flat response to 100 Hz compared to 120.
No. I was referring to driver designs. There's isn't any great options out there today, at least not that I'm aware of that's also payable (not considering brands like ALE and GOTO). JBL made some pretty good mid bass horn drivers but they are obsolete. Besides, they can also be improved .Let me guess - a even larger horn?
So getting our own driver designed is the way to go.
I don't think there's market for a bigger horn. Besides, I don't quite see the point either for home use considering our mid bass horn has a constant directivity down to and even below schroeder. Below the schroeder frequency room modes will dominate any way.
Would this be another 15" driver or an 8 inch like with POOH'S horn? I am considering making an 8" 2.1T field coil driver here in Oslo.
Well, then you will like what a nice member called Hentai helped me with: Field Coil Conversion JBL 2220H - Project Ryu Blog
Electro motor, right?
Nice work.
We're taking a different route. Here's a possible scenario with an upcoming driver in our horn. JBL 2220H is the black graph.
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I'm planning to crossover around 600 Hz, depending on driver and the sound. Need to experiment some.
I would like however, a horn that remains the sensitivity up to 800 Hz. The graph for the simulated driver keeps it it going further than what's really needed, but it does give a lot of flexibility.
Besides that, I'm hoping for an upgrade in general quality compared to JBL 2220. We'll see how it goes in a comparison.
I would like however, a horn that remains the sensitivity up to 800 Hz. The graph for the simulated driver keeps it it going further than what's really needed, but it does give a lot of flexibility.
Besides that, I'm hoping for an upgrade in general quality compared to JBL 2220. We'll see how it goes in a comparison.
FYI - The 2220 is the pro version of the 130A, which makes them both superior horn drivers. However, the the T-S parameters of the BD15 are no match to the JBL speakers. The 2220 will operate in a volume of approximately 2.2 cubic feet admirable. Without running any calculations on the BD15 I estimate the volume required for that driver would be in the 3 to 4 cubic foot region.
I have to agree with this. The 2220 JBL is pretty "screechy"
Look good on paper for a horn BUT lolSorry to interupt but has any of you compared Jbl cmcd 81h vs. cmcd 82h?
Any significant improvement in cmcd 82h over Cmcd 81H - is there actually any upgrades in the cmcd line after 82H version? I’ve traced some data about variable sensitivity (?)SPL 110-112 db of cmcd 82H vs 108 db per 81h + changed magnet system in 82h. I was wondering whether you have any full specs of both 81h and 82h drivers at hand, please? I’ve seen that 81h could go down as low as 250-300Hz then number of upper limits shown – 1200-1600-1800Hz? How about the 82h capabilities in that respect?
Another thing is the enclosure of these – shortened wooden conical/round tractrix or the recommended PT-K95MH waveguide (90° x 50°, 18 x 18in) so that getting down to approx. 300Hz (doubt about the material used in these) would suite best?
Finally - do you know if the gasket, phase plug and grid for the insects – are all these 81h features fully compatible with 82H driver as well?
Your feedback is highly appreciated.
Thank you
Seems you had exactly the same idea as I (even the same exact crossover points) but 4 years sooner (I only just got a pair of Khorn clones a year ago). I'm too lazy to go through the whole thread right now so I'm going to cut through the chase: have you got anywhere with it?
After searching high and low for a suitable driver, I have given up. The only thing I could consider fitting my requirements would be a modified LaScala bass horn. The problem with the LaScalla /Belle bass horn is that it won't fit above the Khorn - it will just look ugly - but that's the only thing that fits the specs and - most importantly - shares the same driver with the Khorn. If it could somehow be adapted into something fitting in a corner, then it would be perfect (probably a lot harder than it sounds).
My specs require that the driver should be nothing fancy or expensive and on par with the rest in the existing system (else I would have to upgrade the rest of the drivers in the Khorn). My Khorn clone sports a CTS ceramic magnet woofer (very cheap) and an Atlas alnico midrange compression driver (not the expensive version, the one without the tabs and with the spring connection terminals instead).
My search for a suitable compression driver came up with zilch. The closest I got to was a new Celestion neodymium (or was it ceramic?) driver but even that has a higher low limit in the response (I think something like 250-300Hz) and the crossover point is even higher. It's probably quite expensive too.
As I've given up for now, I'm thinking of stacking a pair of Quads on top of the Khorn just as an experiment. I would be multi-amping so setting the levels would not be an issue.
After searching high and low for a suitable driver, I have given up. The only thing I could consider fitting my requirements would be a modified LaScala bass horn. The problem with the LaScalla /Belle bass horn is that it won't fit above the Khorn - it will just look ugly - but that's the only thing that fits the specs and - most importantly - shares the same driver with the Khorn. If it could somehow be adapted into something fitting in a corner, then it would be perfect (probably a lot harder than it sounds).
My specs require that the driver should be nothing fancy or expensive and on par with the rest in the existing system (else I would have to upgrade the rest of the drivers in the Khorn). My Khorn clone sports a CTS ceramic magnet woofer (very cheap) and an Atlas alnico midrange compression driver (not the expensive version, the one without the tabs and with the spring connection terminals instead).
My search for a suitable compression driver came up with zilch. The closest I got to was a new Celestion neodymium (or was it ceramic?) driver but even that has a higher low limit in the response (I think something like 250-300Hz) and the crossover point is even higher. It's probably quite expensive too.
As I've given up for now, I'm thinking of stacking a pair of Quads on top of the Khorn just as an experiment. I would be multi-amping so setting the levels would not be an issue.
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Yes. I had a midbass developed myself. However, it's a commercial project and I put it on hold till I have developed a top horn as well. The goal of the top horn is improve upon the Klipsch K-402 horn, something I'm confident we can do. Don Keele is helping with the design. It might become a new horn type; to my knowledge what we're looking at hasn't been done before.
Here are some pictures of the midbass horn I had built some years ago. It measured (the polar) very well.
With the Klipsch K-402:
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Hi Omholt,
The midbass horn look fantastic!
Two questions that I hope you will be able to answer:
1. Do you have any ideas about the proximate price a pair of the midbass horns incl. the new 15" driver?
2. Which compression driver are you working on for the improved K-402?
Thanks!
Best regards
Peter
The midbass horn look fantastic!
Two questions that I hope you will be able to answer:
1. Do you have any ideas about the proximate price a pair of the midbass horns incl. the new 15" driver?
2. Which compression driver are you working on for the improved K-402?
Thanks!
Best regards
Peter
Yes. I had a midbass developed myself. However, it's a commercial project and I put it on hold till I have developed a top horn as well. The goal of the top horn is improve upon the Klipsch K-402 horn, something I'm confident we can do. Don Keele is helping with the design. It might become a new horn type; to my knowledge what we're looking at hasn't been done before.
Here are some pictures of the midbass horn I had built some years ago. It measured (the polar) very well.
With the Klipsch K-402:
Thank you. It's simply plywood that has been painted.
1. One of the reasons I didn't put it into production is because the price of building it in thick and quality material. It cost a lot due to the horn being both very big and asymmetric. I didn't see a market for it for DIY people. So that's why I moved on towards a complete horn speaker. However, I'm open to sell the midbass horn separately but expect a high price. Perhaps some early adopters/conceivers could be given a discount in return for pre-ordering. That would help us set it into production. But it will be quite expensive either way, especially with a high quality finish.
Most likely it will be sold with a new 15" driver from Acoustic Elegance. The midbass horn in the picture might be adjusted some by the way.
2. I will start by using Radian 951BePB but also plan to experiment with at least another driver.
Lyd & Akustikk | Radian 951PB og 951BePB
I'm using the Radian the 950BePB (with 2" exit) today in the Klipsch horn. I found the Radian driver to sound smoother compared to JBL 2446 with beryllium.