I don't want to hijack this thread.
My project is very small, it's a pair of bookshelf nearfield monitors (about 17 liters each).
My project is very small, it's a pair of bookshelf nearfield monitors (about 17 liters each).
Is this the WG you're currently using?
Or this?:
For pairing with a B&C 8PS21, I would suggest:
- RCF H100
- Faital Pro STH100, short elliptical tractrix horn.
But since your driver is screw-on, I would stick with JBL > PT-F95HF.
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Has it been tried to put a mesh grill on the horn exit in order to raise the acoustic resistance ?
Well this has got me baffled pun intended
Over 300 posts
Nearly 30,000 views
Does this driver exist on the open market for Anyone to buy or is it all marketing bumpf
Lots of gobbledygook and in-house arguing amongst members makes me want to pee myself🙄
Over 300 posts
Nearly 30,000 views
Does this driver exist on the open market for Anyone to buy or is it all marketing bumpf
Lots of gobbledygook and in-house arguing amongst members makes me want to pee myself🙄
For those who have not understood (or are slow).
It can transform this.
Into this (with some serious limitations).
A (cloth)grille covering the horn mouth, a constriction in the horn mouth, or do you refer to the bugscreen at the exit of the driver?
I haven't got the faintest idea, but I do know very few people on this planet could match the expertise of these 2 gentlemen regarding horn science.
For those who have not understood (or are slow).
It can transform this.
Into this (with some serious limitations).
All you have done here is to show the FR response on a selected horn (seas-30) vs plain wave tube measurement.
Now for those of us that are slow does this driver exist and is it readily available to buy????
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charlie2, throughout the thread you'll find some info regarding availability, price etc.
Up to now the driver has been available to OEM buyers only.
As it stands, Celestion is still in the testing phase.
Up to now the driver has been available to OEM buyers only.
As it stands, Celestion is still in the testing phase.
Availability,?..that’s the issue price ?, still testing 🙄unobtainable 😉after years of research something seriously wrong 😱😕
Don't forget to wrap yourself in humidity-resistant grill cloth first.
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Are Celestion guilty of number fudging and graph smoothing ??
Celestion axi2050
108db sensitivity on seas-30 horn ————-140db in a plane wave tube
Vs
Jbl 2445
111db sensitivity on 2380 horn ————118db in a plane wave tube
Celestion has a 22db gain over jbl in a plane wave tube yet the jbl has a 3db gain over Celestion on a horn, how does that work?
Thoughts please.
Both driver parameters are online to view
Celestion axi2050
108db sensitivity on seas-30 horn ————-140db in a plane wave tube
Vs
Jbl 2445
111db sensitivity on 2380 horn ————118db in a plane wave tube
Celestion has a 22db gain over jbl in a plane wave tube yet the jbl has a 3db gain over Celestion on a horn, how does that work?
Thoughts please.
Both driver parameters are online to view
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I don't think there's something seriously wrong.
Considering the complexity of the driver, the advanced and new technology involved, testing the driver in the field makes sense to ensure long-term reliability.
In addition, Celestion improved the driver's performance along the way.
In short,
As you may, or may not know, the JBL 2380 is quite different from the SEOS 30.
The latter is a waveguide largely based on the Oblate Spheroidal (OS) coordinate system. These type of horns provide limited acoustic loading compared to more traditional horns. Hence the difference in sensitivity.
The PWT comparison is much more complex, due to significant differences in Magnet system, Diaphragm, Phase Plug etc. between the 2445J and Axi2050.
These and other factors affect PWT performance.
Conclusions from an experiment with a 6" diaphragm, midrange compression driver using a Bob Smith style phase plug. A similar, but futher improved, phase plug is also used in the Axi2050:
"The target midrange compression driver efficiency of 75% and maximum output of 500 acoustic watts has not yet been achieved, but the 45% maximum efficiency compares very favorably to a large format JBL 2445 driver which was measured at 34% under the same conditions.
Increased output would be obtained by reducing moving mass and improving secondary cooling.
A 10, 20 or 50:1 compression ratio phase plug would boost the acoustic output substantially as well for voice only applications, with a concomitant increase in distortion."
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From the same paper:
"Voice intelligibility is often improved by 100 percent peak clipping applied electronically. This application may well benefit from an advanced DSP based predistortion process to optimize output while projecting an intelligible voice out to 500 Meters with 98 dB SPL, using a single driver and 30 degree horn."
"Voice intelligibility is often improved by 100 percent peak clipping applied electronically. This application may well benefit from an advanced DSP based predistortion process to optimize output while projecting an intelligible voice out to 500 Meters with 98 dB SPL, using a single driver and 30 degree horn."
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In my simple comparison between the JBL 2445 + 2380 and Axi2050 + SEOS 30, obviously the technical differences between the drivers still apply, but these are dominated by the respective horns.
It makes more sense to look at the PWT response to enable a meaningful comparison between both drivers. Getting the horns out of the way, so to speak.
Even more so when you take into account the 2380 was specifically designed to be used in combination with the 2445.
It makes more sense to look at the PWT response to enable a meaningful comparison between both drivers. Getting the horns out of the way, so to speak.
Even more so when you take into account the 2380 was specifically designed to be used in combination with the 2445.
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It's an idea of someone who don't have any more rational idea in order to reduce the size of a horn.
A horn don't create energy, it just canalise it, the art of lobes shaping seems not be well understanded by everyone.
That's not what I am suggesting, but I guess your comment reflects a general observation.
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