Interesting.. I have RCF ND950 2.0 and could try it with 460-36. Would it be possible to get the file of that conical connector? Or is it so simple that just a 3d-printed shrink tube with 60mm length would suit job?
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That's driver-specific. As the ND950 2.0 is obviously the 1.4" version with an additional throat adapter, it's probably best to replace the existing adapter with a "phase-plug to 1.4 throat" adapter instead (or just try to use it without the existing one). Its length will affect the tuning frequency of the extension, which should also/ideally match the driver in some way, but that's not solved yet, 60 - 100 mm should work. This is nothing but a cut-and-try approach at the moment...
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Thanks for reply mabat. I will disassemble the ND950 and study for a suitable fitting, maybe more for different lengths for testing. Ill receive tomorrow X1C 3d-printer and going to print 460-36 petals from this link: https://at-horns.eu/img/athex/ATHEX-460-36-CAST.stl (need splitting for X1C still)
I couldn't find a base unit for petals, is there one available?
I couldn't find a base unit for petals, is there one available?
A post discussing resonances that occur due to slotted baffles, also with the synergy horn application: https://www.audiosciencereview.com/...d-baffles-i-e-graham-audio.45472/post-1621006
I used the slotted baffle technique in a slightly different way, as throat for a fullrange driver (fe127) with a tractrix front horn. My idea was to have some compression and better dispersion by making the rectangular throat about 1/3 less wide and the height the same as the cone. Worked well but in that time I could not measure it, so a subjective conclusion based on listening.
This is what I used (attached) but with a 3D printer on hand, you can easily create your own that will suit your needs the best...
I tried to clean a bit the throat/extension/WG interface - still not perfect but better 🙂
Polars at some off-axis angles (roughly 0/10/20/30), gate ~5 ms:
0 - 30 cm from the center of the mouth at 4 steps with a longer gate (~18 ms):
ATHEX 460-36/EXT + 1" Peerless DFM-2535R00-08
Polars at some off-axis angles (roughly 0/10/20/30), gate ~5 ms:
0 - 30 cm from the center of the mouth at 4 steps with a longer gate (~18 ms):
ATHEX 460-36/EXT + 1" Peerless DFM-2535R00-08
I haven't tried at the moment, as making a proper crossover would need to be done much more carefully than e.g. with the big driver, which seems to be a very forgiving setup.
There's really a great potential in using large-format drivers at their phase plug exits, even if radiating e.g. through a 1.4" aperture.
If we can reach 500 Hz with such an ease, there's really no reason for any MEH or something, IMO.
There's really a great potential in using large-format drivers at their phase plug exits, even if radiating e.g. through a 1.4" aperture.
If we can reach 500 Hz with such an ease, there's really no reason for any MEH or something, IMO.
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Is there anywhere the input script/parameters available for the ATHEX-400-36/25? Of course without extension. Sorry if I missed it...searched but did not find it.
Any other drivers you think can be interesting? If free choice....what would be your guess/attempt?
Any other drivers you think can be interesting? If free choice....what would be your guess/attempt?
No, only the STLs. For an own experimenting I can only recommnend the 460-36 which seems to be a good all-round performer, big enough, which is still important.
As for a driver, I really don't know. I don't have any dreamt-of. That's also the reason I publish these designs - to let to test whatever people already have.
As for a driver, I really don't know. I don't have any dreamt-of. That's also the reason I publish these designs - to let to test whatever people already have.
BTW, the D2500Ti-Nd was also very pleasant to listen, virtually without any filtering/EQ needed, other than a basic high-pass around 500 Hz.
The raw response in 460-36/EXT -
The raw response in 460-36/EXT -
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Besides small exit Angle...any hint what could be relevant parameters of the driver for lf extension? Changing tube length is surely something I should try then, too.
Will check later how to change in CAD with existing stl (grab the curvature from it) to a Okta-Design....imagine a nice red-white Umbrella Corporation design ;-)
As far as I read here it should not influence performance largely...?
Might be some work as need to re-design for that but does not matter. Look would be cool in my home cinema 😎
Will check later how to change in CAD with existing stl (grab the curvature from it) to a Okta-Design....imagine a nice red-white Umbrella Corporation design ;-)
As far as I read here it should not influence performance largely...?
Might be some work as need to re-design for that but does not matter. Look would be cool in my home cinema 😎
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I'm not sure about the small exit angle as a requirement. For example the D2500Ti-Nd (a photo below) has a pretty wide-angle exit section, although only short. Then if I wanted to try to get a maximum out of it, I would try to start the extension at the phase plug exit, perhaps even with something else than a conical shape. Small exit angle is probably good if you want to use a stock 1" driver as it is...
Adapt a driver exit angle is nothing I would mind doing. Measure the original shape is the only "issue" as not easily to acess with a caliper. So...does not help to shrink the list of candidates 😄
I wouldn't be too worried about the exact match. Narrow/wide exit, just by looking at it, is what I would consider a fine-enough precision, honestly...
What about CD membrane design? Your tested drivers all have a dome diaphragm. May a BMS ring diaphragm behave different? Or the HF1440 I have here (unfortunately 1.4"....otherwise for even extended low end interesting). The LF extensions "uses" some resonance. the impedance of the CD diaphragm could make a difference here regarding its stiffness/withstand...