The impedances above show that the (axisymmetric) HOMs of a source (i.e. any deviation from a flat or spherical wavefront), if any, won't have virtually any effect on the radiated far-field response below ~12 kHz (depends on how we define the cut-on frequency). This means that the polar pattern is basically independent of a particular driver used up to this frequency, so we can rely on the presented simulation (using an ideal source) this high.
The simulated polars already contain HOMs of the waveguide, those are different (and I don't know how to separate them, but I suspect that it's what makes the polar pattern narrow very high up in frequency). But we know that these polars won't change with any real driver up to the lowest cut-on of its HOMs. (Well, that's still only for the axisymmetric modes. I have yet to implement the non-axisymmetric modes. Any ideas whether their lowest cut-ons will be higher or lower than the lowest axisymmetric?)
The simulated polars already contain HOMs of the waveguide, those are different (and I don't know how to separate them, but I suspect that it's what makes the polar pattern narrow very high up in frequency). But we know that these polars won't change with any real driver up to the lowest cut-on of its HOMs. (Well, that's still only for the axisymmetric modes. I have yet to implement the non-axisymmetric modes. Any ideas whether their lowest cut-ons will be higher or lower than the lowest axisymmetric?)
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I'll also make a "hex kit" for the A460, this is as simple as it gets.
horn: 520G2 extended
driver: La Voce 10.171K
filter: 200hz LR4 (for protection)
measurement: 0 to 60 degrees incrementally (about 3 degrees each)
eq:
q:2.6 g:-2.7 @542hz
q:3.1 g:3.2 @734hz
q:3.4 g:-1.5 @1065hz
q:1 g:-3 @3195hz
q:1 g:-2.2 @ 7716hz
driver: La Voce 10.171K
filter: 200hz LR4 (for protection)
measurement: 0 to 60 degrees incrementally (about 3 degrees each)
eq:
q:2.6 g:-2.7 @542hz
q:3.1 g:3.2 @734hz
q:3.4 g:-1.5 @1065hz
q:1 g:-3 @3195hz
q:1 g:-2.2 @ 7716hz
Looks very clean. The waveguide, but also the measurement. How did you measure this and what smoothing did you use?
This was my target curve
I do not eq over 10khz
measurements is from 1m and with 5ms gating
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1/24 smoothing. 5ms gating and 1m distance. I have a setup at my listening and testing space for measurements.
ATH A460 - there's an STL kit available now.
- It's axisymmetric, so you see the complete performance. Not just the better half of it 😉
- It's axisymmetric, so you see the complete performance. Not just the better half of it 😉
Looks amazing!
So the new A460 STL has everything the Peerless DFM-2535R00-08 needs? No adapter required?
So the new A460 STL has everything the Peerless DFM-2535R00-08 needs? No adapter required?
Yes, it's the whole device, the base part comes with a mounting flange (Ø90 x 12 mm) -
Is there anyone else doing modeling on a MEH waveguide with the Peerless driver? I know there was the one fellow who was doing the auto-optimizing thing ("genetic"?) but I'd love to see if anyone can do something with 1 or 2 TC9FD drivers that I can shamelessly exploit for my own purposes. 🙂
BTW, it could be easily made with the DI more flat -
I think I'm going to make these two. Maybe some day there will be a proper test made. The size is the same.
I wouldn't call myself a specialist but in tuning my SH50 style MEHs I have maximum dB cuts at 3500 to 7000Hz etc just to kill off some stray higher freq play through.
Other than that nothing, and the low pass and high pass looks like nice slopes at 300 and 1000Hz.
Below is one of my work in progress no PEQs / PEQ, no XOs..
Don't look at the phase, I fixed that later..
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