Thnx, @mabat
I was most interested in trying to extend the driver bandwidth downwards - and it works. But I'm still surprised at how consistent the treble sounds, except that in the extreme couch positions, the soundstage doesn't hold as well as it did with the 950 RCF horns. But a little more toe-in and a little more treble in the direct radiation and everything works fine again.
Anyone who can get the original EXAR 400s 3D printed should absolutely try it with a capable compression driver. 
I use it with SB65CDN-T with a 1.4 inch to 1inch throat insert (horns partnerd with Satori WO24P woofers). The complete system is driven by a small Zoudio amp. The system is magical. Best music system I have had/made/heard at home yet.
I use it with SB65CDN-T with a 1.4 inch to 1inch throat insert (horns partnerd with Satori WO24P woofers). The complete system is driven by a small Zoudio amp. The system is magical. Best music system I have had/made/heard at home yet.
1.4", 1" and 1" extended, so far. I may do some 2" as well, but I think that's already somewhat limiting.
I already have a 2"->1.3" adapter for Radian 760NEO (connecting directly to the phase plug). But for that I want to examine the actual phase plug a bit first - I'm still curious about the internal expansion rates.
Also a 1.4" extended is in the pipeline (basically what Oleg did).
I have all the parts printed for some time already, now to assemble...
I already have a 2"->1.3" adapter for Radian 760NEO (connecting directly to the phase plug). But for that I want to examine the actual phase plug a bit first - I'm still curious about the internal expansion rates.
Also a 1.4" extended is in the pipeline (basically what Oleg did).
I have all the parts printed for some time already, now to assemble...
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So the 550ex seems to perform well with my dcx464. Meanwhile we could listen to the finished pair. Crossover looks good at 400Hz but 350 could be done with higher order filter.
Now the question to all synergy-lovers: for 350-400Hz....where to place the low frequency transducers in the throat? Of course closer to the mouth will have less mf/hf influence but what distance is still save to have a proper coupling?
Now the question to all synergy-lovers: for 350-400Hz....where to place the low frequency transducers in the throat? Of course closer to the mouth will have less mf/hf influence but what distance is still save to have a proper coupling?
Working on a new toy - a phase plug design tool.
You freely draw a channel centerline (as a Bezier cubic) and it automatically sets the area expansion to the one prescribed by another user-defined curve (the one at the bottom). The black horizontal bars indicate the lenghts of the channel.
I played with it for a while and it's not so easy to design a good phase plug. Now I need to implement an export to ABEC.
You freely draw a channel centerline (as a Bezier cubic) and it automatically sets the area expansion to the one prescribed by another user-defined curve (the one at the bottom). The black horizontal bars indicate the lenghts of the channel.
I played with it for a while and it's not so easy to design a good phase plug
. Now I need to implement an export to ABEC.
Any number of channels. Convex dome will also be an option (for a spherical output wavefront, which seems impossible with a concave diaphragm).
I only wonder if a cubic spline is enough. It depends on how wild meanders are acceptable for the channel length equalization.
I can release a try-out version when I have it a bit more polished.
I only wonder if a cubic spline is enough. It depends on how wild meanders are acceptable for the channel length equalization.
I can release a try-out version when I have it a bit more polished.
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I wonder if no expansion what so ever was good? Like 6 channels or something. I mean, why there seems to be 3 channels on 1" drivers? Perhaps due to the wavefront shape: less channels have more room to affect length of the channels? I'm thinking loud, if the channels (inlets) were more close to each other perhaps there was less smear on top octave? Or perhaps channel size to cavity size needs to be something particular, which then dictates number of channels per diaphragm and throat size ratio, or something.
Your observation of concave diaphragm not being able to make spherical wavefront is interesting. Can we assume from here no ordinary compression driver has spherical wavefront? conversely, any compression driver would likely have flat wavefront as target, and perhaps even miss that. Anyway, interesting stuff
Your observation of concave diaphragm not being able to make spherical wavefront is interesting. Can we assume from here no ordinary compression driver has spherical wavefront? conversely, any compression driver would likely have flat wavefront as target, and perhaps even miss that. Anyway, interesting stuff
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