Then use the Grid Export options to generate XYZ data and import it into Solidworks with my Excel Macro
Acoustic Horn Design – The Easy Way (Ath4)
Or use the inbuilt Curves from XYZ command and format the data to fit. I posted about that earlier in the thread but the Excel Macro is a lot easier for doing it many times.
Or download Fusion for free and use the .afp option in Ath and export to step or DXF from a sketch in Fusion for use in whatever software you prefer 🙂
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Perhaps a damping solution would be to fill the “trough” (see image) with a self-leveling polyurethane used for filling cracks in cement
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Hi fluid,
thank you, I will try the macro, this way I will not have to take the detour via Fusion.
Kindest regards,
M
thank you, I will try the macro, this way I will not have to take the detour via Fusion.
Kindest regards,
M
WG seem to disperse the same with 3 different CDs but one can see no common FR features between the different CDs so WG seem CD transparent which I suppose is really good. I can see no ringing in FR but these will rather be seen in impedance traces and/or in the time domain. Looks nice! I'd pick the Celestion and run it > 1,5k - probably ;-)
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Earthenware or porcelain? 😉
The measurements look good so far. I don't see any hint of ringing attributable to the waveguide, but high-Q stuff obviously won't show up very well with a short window. It may be useful to record the ringing (when tapping on the WG) to determine the frequency so you know where to look.
Thanks. I will work that up tomorrow AM. These are good without overlap but could well be better with. Otoh, no overlap allows 1" exit cd
Earthenware. It's a multitude of frequecies between 0.7 and 5 kHz. Maybe a stepped sine distortion masurement with a very small frequency step would show the actual level of the problem (will try that today if the family leaves for a while). Otherwise it's not really visible in the FR even when you know where to look - at least I see nothing suspicious, other than the received reflections.
Below are FRs for three different time window lengths (5, 10, 50 ms). After 50 ms it doesn't change further. No smoothing.
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I don't see anything either. You might try a few measurements at around 90-120° azimuth (the same for each measurement) while rotating the waveguide about its axis of symmetry. The radiation of the waveguide itself at its resonances should, if I'm thinking about this correctly, resemble some kind of complex multipolar source and have a different radiation pattern for each resonance. A bell, for example, radiates like a lateral quadrupole at its fundamental resonance.
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Actually, after thinking a bit more, I realized that the basic "bell mode" shouldn't be excited in this case, so my suggestion above may not be very useful.
2nd is quite high. 3rd above 2,3k is amp territory - wow. How many dB SPL is 1m for 1v? Clean impedance is reassuring.
An other test would be to impose a real electrical step or pulse and record it. Because the from a sweep (steady state) derived pulse response is calculated and probably perfectly "true" for the small signal situation. But a real pulse has a lot of more instantaneous energy imposed into the system and therefore will trigger resonances more like in a real music reproduction situation.
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An other test would be to impose a real electrical step or pulse and record it. Because the from a sweep (steady state) derived pulse response is calculated and probably perfectly "true" for the small signal situation. But a real pulse has a lot of more instantaneous energy imposed into the system and therefore will trigger resonances more like in a real music reproduction situation.
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I don't have it calibrated to the absolute but I guess it can be around 100 dB SPL in the middle of the band.
Well, minimizing the linear distortion, no doubt about that. Basically maximizing the performance in accordance with CEA-2034, as the necessary part. Anything above that is a nice bonus.
So far I'm not sure how to deal with something as damping of the waveguide - how to even assess the level of performance. When it's good enough?
So far I'm not sure how to deal with something as damping of the waveguide - how to even assess the level of performance. When it's good enough?