For a while I returned to a free standing R-OSSE, needing a horn for BMS 4554 1.4" driver.
It's including a throat adapter (making the driver exit section a part of the profile), i.e. starting at 16 mm diameter. It's still hard to beat.
(⌀380 x 190 mm, including 43mm adapter)
Solved in circular symmetry mode:
Solved as a general 3D mesh - I wanted to know how worse it would be, not much:
BTW, the formulas in the paper are now finally all correct, hopefully (should be, as I implemented a new code based on that and it works).
It's including a throat adapter (making the driver exit section a part of the profile), i.e. starting at 16 mm diameter. It's still hard to beat.
(⌀380 x 190 mm, including 43mm adapter)
Solved in circular symmetry mode:
Solved as a general 3D mesh - I wanted to know how worse it would be, not much:
BTW, the formulas in the paper are now finally all correct, hopefully (should be, as I implemented a new code based on that and it works).
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Nice.
How far inside a infinite baffle can you put the driver without it causing excessive damage to the response?
That bigger sand horn was never made.
If all goes well I'll be measuring HF1440 in this horn next week (R-OSSE/KVAR variant), about the same size:
I don't know. I mean, there's really no point in doing that. This is already free standing, no baffle around.
Sure, the screen removed. BMS 4555 would be even better but 4554 is what I have. My next candidate is FANE CD131. What's needed is as large exit angle as possible with as small phase plug exit diameter as possible. This way two things can be improved - 1) extending smooth directivity control at HF, 2) eliminating a reflection otherwise caused by wavefront mismatch at the driver/WG interface. Well, at least in theory.
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Advantage being you have pattern control up to 20khz with a larger diaphragm driver?
that is only possible way to make it, otherwise there is no room for adapter. When you suggest that couple years ago I tried to design it for several CDs but no space if want to implement the best curves which are opening quite fast
I suppose the k is quite high and coverage angle on lower side in your design to allow CD exit implementation.
Btw graphs looking excellent
Sure, not all drivers are equally suitable for this.
- If a really constant DI up to 20 kHz is the priority (for me it isn't), it's always possible to start with a short straight duct section, allowing a faster opening afterwards. This won't have any negative effect on polar response but will add some reflection that will need to be corrected via EQ.
- If a really constant DI up to 20 kHz is the priority (for me it isn't), it's always possible to start with a short straight duct section, allowing a faster opening afterwards. This won't have any negative effect on polar response but will add some reflection that will need to be corrected via EQ.
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would be great for PAIs it purely sporting interest or is there some practical need for this?
I've actually never heard anything like that (and doubt that anyone has) but I believe it can't be important...
Anyway, it should be possible if anyone wanted to try.
It seems that sooner or later you will come to design your own driver and horn as one whole device
As far as I know, in the PA, the more actual problem is controled directivity at low frequencies.