I meant this, although I still doubt it's needed at all. With an extended throat and e.g. the 4554 we can get to ~600 - 20k of very smooth sound from one source.
- This is exactly what I had in mind when I mentioned the same voice coil diameters. I wasn't aware that JBL pursued just that already ten years ago -
One would think this should be an exceptional driver - was it actually ever produced and used?
- This is exactly what I had in mind when I mentioned the same voice coil diameters. I wasn't aware that JBL pursued just that already ten years ago -
One would think this should be an exceptional driver - was it actually ever produced and used?
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Basically I agree that starting at 600Hz is already excellent. However, in any non-coaxial arrangement you still get some inconsistency in radiation pattern (typically vertical if combined with a 8-15" woofer). Still thinking about how this can be improved...
Again, this is, IMHO, how a coaxial driver should be done:
I just can't find any more information about these in particular.
I just can't find any more information about these in particular.
That's different, D2 uses two identical diaphragms (or virtually identical) - that's the "old concept" in JBL terms.
In theory nice but in reality the diameter of such diaphragms differ too much. Check below the 4554 vs 4591. And a mich smaller dia like the 4591 will not bring you down to 300Hz.
Working on the waveguide for Audax TW034 (1.3" dome tweeter) -
It's not a problem to get to ~140° nominal coverage angle. Now I need to print and test this, as I don't really believe it will maintain this behaviour this high, being it a soft dome.
It's not a problem to get to ~140° nominal coverage angle. Now I need to print and test this, as I don't really believe it will maintain this behaviour this high, being it a soft dome.
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Anyway, one thing is clear by now, I think - for any given dome, there's a natural/optimal coverage angle determined by its height. If you know your beamwidth target, you can select the tweeter accordingly. Then you can design a waveguide that will maintain that beamwidth up to 20 kHz (call it constant directivity). The limit seems to be around 140° for the tallest domes available.
v1, ⌀172 x 17mm (probably could be made a bit smaller)
As a direct comparison, Bliesma T34B in the waveguide made earlier (STL is available via Cults for a long time, BTW):
Black line is for -6 dB
Dimensions of the test baffle are 220 x 335 x 40 mm, chamfered edges.
Black line is for -6 dB
Dimensions of the test baffle are 220 x 335 x 40 mm, chamfered edges.
Second time, T34B vs TW034 (see the black curve at -6dB@1kHz):
@mabat, have you ever investigated the performance of the T34B in a freestanding waveguide with rollback like your full-sized ATH horns? I have T34Bs and am trying to decide on implementation, so that is a simulation I would love to see and a file I would love to purchase, as I suspect it could be quite good.
Thank you,
Bill
Thank you,
Bill