no expert either, but by having a small chamber in front of the diaphragm and a port (the midrange throats) you create a bandpass system with a strong resonance. have a look here:
https://www.diyaudio.com/community/threads/two-way-synergy-horn.367812/post-6534221
and disregard if you are already aware of that!
This does look to my uneducated eyes to be much nicer than the first A460 mabat mentioned?
You mean making one even wider? That would be tough. Flat wavefronts are simply not particularly suited for wide directivity at very high frequencies. The wider you make it in the midrange, the steeper is the DI rise in the top octave. Use a dome tweeter without a waveguide for that 🙂
It could work with a wavefront shaping plug, but that's a lot of ifs...
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Sure, why not.
The DI is more flat but this doesn't directly mean it's better in the end. There are some conjectures on this, all sound, but still nothing verified, as far as I know. What we know "for sure" (circle of confusion?) is that a flat power response sounds too bright in most cases. So it comes down to what's the best way of dealing with it. There are several options of different dimensions, DI being one of the variables. I tend to think that the approach chosen for the Gen2 DI slope (and also the former A460) is a pretty good one.
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...This is all readily possible:
The bottom one with DI ~8 dB, that translates to coverage angle ~100 deg:
And it works like this to almost 15 kHz, which is not that bad after all.
The bottom one with DI ~8 dB, that translates to coverage angle ~100 deg:
And it works like this to almost 15 kHz, which is not that bad after all.
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Forgot to say, I did do dishing of the two 19mm taps.
About 35mm across dishing in to the inner wall of the horn, about 1 to 2mm thickness left at the actual entrance.
Crude but seems effective🙂
The overall diameters are the same. Lengths vary, hand in hand with the coverage angles.
To overcome upper end resonance in passband you need a phase plug - in other words little air and short length between diaphragm and aperture in horn.
That's a beautifully clean profile. Would it also be possible to have a hex kit for the standard A460G2 provided that it will fit in a 180x180x180 build volume? i have a pair of Lavoce DF10.172K I'd like to try in this while I wait for the Tymphany group buy drivers to be delivered.
So should be filling in with a dome under the cone, not dishing?
I've seen things like that on LF.
Don't think I've seen it on MFs.
Adding chamfer will have little effect like flaring the Helmholtz port? Adding front volume below. Danley uses large opening to overcome the resonance.
To check - opening as large as midbass cone but dense infill forming quasi compression.
To check - opening as large as midbass cone but dense infill forming quasi compression.
Patrick Bateman in Metalko III used similar conical duct and just equalised the resonance:
https://www.diyaudio.com/community/...e-two-way-unity-waveguide.342019/post-7372395
https://www.diyaudio.com/community/...e-two-way-unity-waveguide.342019/post-7372395
Hi mabat,
Kindest regards,
M
Thank you.
I looked at some of them, regretfully, you do not seem to have designed anything for a 1.5 inch driver. How difficult is it to upscale STL files?
Kindest regards,
M