I'm sure the JBL 15 can play nicely up to 1khz or so in a typical enlcosure, but the bandpass chamber applies an acoustic low-pass filter. If I were to guess the 15's in the SH90 are only playing up to 200 or 300hz. The larger driver and lower xo require larger ports farther from the throat. I just don't see a 15" driver, used as described in the Synergy patent, working up to 700hz or higher with physics being as they are. The patent is available on Google patents......I would suggest studying that thoroughly.
If I were buying new drivers the D2 looks lie a decent deal to cover down to 800hz.
I grabbed up a pair of Faital 140s and LTH142 horns for a great price. Been working a system with AE TD15S crossed at 800hz. The lower crossover to the 3" (1.4" exit) driver adds a lot of detail, dynamics and transient attack to the whole. Can't recommend crossovers above 800 for 15s if a person is seeking the best 15" two way.
I just have a basic RTA but off access there are no suck outs at the crossover at this point. Super smooth top end but be careful what you ask for....with poor or loudness war recordings the imperfections jump out and can drive me out of the room.
For my 2cents I'd consider the JBL 2265 to the D2 at 800hz on a nice horn.
I grabbed up a pair of Faital 140s and LTH142 horns for a great price. Been working a system with AE TD15S crossed at 800hz. The lower crossover to the 3" (1.4" exit) driver adds a lot of detail, dynamics and transient attack to the whole. Can't recommend crossovers above 800 for 15s if a person is seeking the best 15" two way.
I just have a basic RTA but off access there are no suck outs at the crossover at this point. Super smooth top end but be careful what you ask for....with poor or loudness war recordings the imperfections jump out and can drive me out of the room.
For my 2cents I'd consider the JBL 2265 to the D2 at 800hz on a nice horn.
I will soon start a combo with 15" woofer and an almost similar Faital driver on an Eighteensound horn. I will try to cross slightly lower than 800 Hz. The driver is specd for a 650 Hz crossover at half the power than it can take at 900 Hz. I.e 40 Watts (instead of 80 @ 900 Hz) - which would still go extremely loud for home listening.
I will also get some D2s in the next few days. According to some measurements on the web it could probably profit from a crossover frequency above 1 kHz from the distortion point-of-view. I will therefore use it in a three way with two 15" woofers and one or two 10" midrange(s). But I would not be able to start with this project before February.
Regards
Charles
I will also get some D2s in the next few days. According to some measurements on the web it could probably profit from a crossover frequency above 1 kHz from the distortion point-of-view. I will therefore use it in a three way with two 15" woofers and one or two 10" midrange(s). But I would not be able to start with this project before February.
Regards
Charles
Don't know at the moment. I am still researching. The cool ones from JBL are not availabe anymore, at least not new. The current version of Beyma's 10mi100 seems to have lower efficiency and higher THD than the old one...
I will check the PHL out, thanks for the hint. I will allso check if the 10nmba520 from eighteensound is worth a try.
Regards
Charles
I will check the PHL out, thanks for the hint. I will allso check if the 10nmba520 from eighteensound is worth a try.
Regards
Charles
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They have arrived ! Sorry for the bad picture quality.
Haptics and visual quality are very good. The size and weight of the driver are in the same ballpark as a 2426.
It will probably not go very low on that horn. So my measurements will not show the lowest possible extension for that driver.
Regards
Charles
Haptics and visual quality are very good. The size and weight of the driver are in the same ballpark as a 2426.
It will probably not go very low on that horn. So my measurements will not show the lowest possible extension for that driver.
Regards
Charles
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Nate,
Legis' 15" Synergy are good to 500 Hz, which for home use would certainly be a workable crossover frequency for a variety of HF drivers.
http://www.diyaudio.com/forums/subwoofers/258706-study-dipole-cardioid-bass-horn-28.html
I don't recall if he ended up reducing the volume of the bandpass chamber, but that does makes a big difference in the BP cutoff frequency.
By reducing the BP volume in the 2x10" SynTripP, the cutoff frequency (about -3 dB at 900 Hz) was almost as high as in my 2x8" Paraline cabinets.
Art
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The D2 has two 1.5" diaphragms, .8" exit.
The D3 has two 3" diaphragms, it may have a 1.5" (or 1.4"?) exit.
I screwed up, there is (should not have been) a "D3" in this discussion.
The D2430K (like you have, or as used in the M2) is a dual 3" diaphragm with a 1.5" exit, or perhaps closer to 1.4" by your ruler.
The D2415K (as used in the JBL VTX V20) is a dual 1.5" diaphragm with a .8" exit.
At any rate, "D2" is not enough of a descriptor to know which is being referenced in this thread any more :^).
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I was thinking about that one. The port nearly encompasses the entire side wall of the horn at that location. I didn't see any good gated data or off axis measurements in that thread.
Great ! I managed to get hold of 1/4" screws. What wouldn't be a problem in the US can be a little unnerving in some parts of Europe.
While they can be obtained from those guys dealing with car parts (specially for oldtimers) there is another source that I wasn't aware of before: Camera supplies !
As I have learnt 1/4" threads are quite common for camera stands etc. So I got my screws from a good camera equipment specialist here in the city. This is probably helpful for other Europeans looking for 1/4" screws for their D2s.
Regards
Charles
While they can be obtained from those guys dealing with car parts (specially for oldtimers) there is another source that I wasn't aware of before: Camera supplies !
As I have learnt 1/4" threads are quite common for camera stands etc. So I got my screws from a good camera equipment specialist here in the city. This is probably helpful for other Europeans looking for 1/4" screws for their D2s.
Regards
Charles