Generally 4 times the excursion per octave to keep a set SPL. So yes I agree that you cannot simulate these things. I design drivers and I can tell you that this really cannot be accurately simulated. The desk engineers believe that they can. But when you are actually making drivers in the real world it is not the same as computer land.
B&C DH450 are orderable from TLHP, my pair is on its way. I'm especially curious how well it will respond to an extended throat, as it seems that it has basically a cylindrical exit, or sort of.
I got all the prints and drivers here but it seems I actually do need the flange as the extension tube does not have a flange to connect the driver to. So which flange from the package I should print next?
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The flange is made of two STL files, T520-25-EXT-1-flange1.stl and T520-25-EXT-1-flange1.stl, both included in the adapter package you already have, as I understand. It's not clear to me why you don't have those printed as well.
BTW, in the meantime, there's also a matched adapter for the DF10.171K as well. You may be better off with that one.
BTW, in the meantime, there's also a matched adapter for the DF10.171K as well. You may be better off with that one.
It is a misunderstanding. When you said you have everything you need in g2 and you do not need the flange, I understood wrongly 🙂 I will print them now.
My first measurement of the DH450 with A520G2:
It definitely sounds promising (just like about any other compression driver out there 🙂).
- Take this still as rather preliminary, I was impatient and quickly put it together...
(Again, the SPL axis is not calibrated. It's actually very sensitive for its size. This will a tough competitor overall.)
It definitely sounds promising (just like about any other compression driver out there 🙂).
- Take this still as rather preliminary, I was impatient and quickly put it together...
(Again, the SPL axis is not calibrated. It's actually very sensitive for its size. This will a tough competitor overall.)
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Is that the raw measured response?
I assume that there's no compensation and if that's the case it looks to be a really nice combo for simple passive crossover implementation.
I assume that there's no compensation and if that's the case it looks to be a really nice combo for simple passive crossover implementation.
Yes, raw responses, no further processing. We have seen a similar response from the Lavoce driver, which is even smoother and more extended (probably not nearly as sensitive, but I haven't checked yet at absolute levels):
Lavoce DF10.171K
B&C DH450
Both sound very nice, at about the same price. The very high frequencies from the DH450 sound particularly "relaxed", maybe because half of the annoying top octave is missing 🙂
I believe that for a PA use, the DH450 will have an edge. For home reproduction, I'm not sure. I could definitely listen to both, if I was able to tell the different at all, not knowing which is which. All these drivers are really far more similar than different.
Lavoce DF10.171K
B&C DH450
Both sound very nice, at about the same price. The very high frequencies from the DH450 sound particularly "relaxed", maybe because half of the annoying top octave is missing 🙂
I believe that for a PA use, the DH450 will have an edge. For home reproduction, I'm not sure. I could definitely listen to both, if I was able to tell the different at all, not knowing which is which. All these drivers are really far more similar than different.
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That looks very promising!
What would be the most useful configurations with midrange drivers?
Midranges should have an equal dispersion at crossover frequency for overall horizontal dispersion... But regarding the diameter of the Horn and the resulting center to center distance - what about vertical dispersion?
What would be the most useful configurations with midrange drivers?
Midranges should have an equal dispersion at crossover frequency for overall horizontal dispersion... But regarding the diameter of the Horn and the resulting center to center distance - what about vertical dispersion?
You need to consider also the wavelength at the crossover frequency, which is correspondingly larger. It's no different (or worse) than any other loudspeaker with noncoincident drivers. It's the crossover design that must deal with this.
Right. With such a perfected waveguide we want to be better than any other loudspeaker ;-)
Asuming 900 Hz xo and a 8" mid driver, wavelength is just in the region of distance of centers (380 mm).
Maybe a symmetrical MTM configuration with (small) mid drivers would be nice.
Asuming 900 Hz xo and a 8" mid driver, wavelength is just in the region of distance of centers (380 mm).
Maybe a symmetrical MTM configuration with (small) mid drivers would be nice.
No, don't do that, that doesn't help anything...
15" woofer, or maybe 12", and ~700 Hz crossover seems like a natural first choice. With the extended throats it's possible to go even lower, as there are no "group delay issues" (i.e. mouth reflections).
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I have a preliminary design where I plan on crossing to a 15" woofer (AE SBP15) with a 600hz crossover but the measurements will dictate the results. So first things first, put the horn together and measure!
I am still sanding the individual parts. I will then glue them together, use fillers, sand again, then primer and paint.
I am still sanding the individual parts. I will then glue them together, use fillers, sand again, then primer and paint.
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At least for myself, it would be interesting to see SPL, Impedance and phase on the same graph. That will let us look and see if there are internal resonances or structural resonances in the driver diaphragm. The other way is a CSD plot. A CSD can actually tell you a lot about how the driver and horn will really behave itself.
It is all minimum phase. Especially below ~5 kHz it's just a matter of a simple EQ and for the same amplitude target everything else will be the same as well (time response, phase, group delay, CSD, name it). Any kind of nonsmoothness above ~5 kHz is always the driver, virtually always a resonance. Not necessarily the diaphragm only, as there's a lot more going on in a compression driver, but I doubt that the exact cause can be determined from a far-field frequency response.
- I can later upload some raw impulse responses to see what others can get from it.
- I can later upload some raw impulse responses to see what others can get from it.
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Yes, there will be. I am working on some designs, I do not want a heavy and bulky looking stand but I want it to fulfill its purpose too.
The box may also be subject to changes however this would be the overall look. It is around 125lt and it models nicely in winisd. It will have a hypex 501 for the bass part, so it will have a dsp. The top will be a simple passive filter and some parallel impedance correction.