Probably the work of Claus Futtrup and co. at DALI with input from the guys at Purifi.
Too bad we can't buy this driver... This is exactly what I'd buy for pure "subwoofer-in"
There's probably no cleaner 15-16" (or ?18") subwoofer driver...
Not likely. Confirmed. 35mm one way.
This much (or more) excursion and variable voice coil winding has been around for awhile, and double inverted suspension has been around for awhile.
The surround is all new
This much (or more) excursion and variable voice coil winding has been around for awhile, and double inverted suspension has been around for awhile.
The surround is all new
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16mm one way linear excursion, 70mm peak to peak before damage, according to various sources. 7cm one way could be ruled out from visual observation alone, as it would require a much larger surround.
Afair the first time I've seen such a design was on the 18Sound 6ND430, for the purpose of reducing surround resonances.
35mm one way, not 70mm one way. I said the 70mm/7cm was likely peak to peak, and you confirmed I was correct. Why would you say "not likely" to my response? Or were you agreeing with me?
Interesting - does anyone know if fostex said what they were doing 'it' for. Or if they made any sort of measurements to support the effectiveness of what they did.??
We have adopted our original foam drabber as the edge material, which was jointly developed with a material manufacturer. It combines the texture of a solid rubber edge with the lightness of a cloth edge, and together with the UDRT shape (*2), suppresses resonance.
he edge supporting the diaphragm has a UDRT shape that allows the front and rear amplitudes to be close to symmetrical, contributing to accurate and clear reproduction of the sound field.
Not really, it has a Purifi surround.
The motor structure looks fairly basic, a large FE mag/deep gap. with a T-shaped pole piece and 2 alu. demod rings.
Will allow high excursion. But with more nonlinearity then a Purifi motor.
Whereupon do you base that assumption? It is a subwoofer w' re talking about after all. The centre polepiece in the Dali motor looks like Dali's proprietary pressed ferrite.
And permeability of Ferrite is quite high.
Could even be as high as Iron in some cases, although that is doubtful for this purpose.
Purifi goes a long way to try and mimic a "air core" in they're motor structure.
The gap is small.
The alu. demod rings are very different in total size.
But only a proper Klippel test will reveal.
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Is it possible to build a 2-way with purifi 6.5? Any thoughts on this?
Alternatively, a small 3-way version consisting of purifi.
Alternatively, a small 3-way version consisting of purifi.
This is definitely possible. I would even say that the 6.5 would be one of my top choices for this.
Take a look at the reference design from Purifi and maybe skimm through this thread
https://purifi-audio.com/blog/tech-notes-1/spk16-reference-design-12
Take a look at the reference design from Purifi and maybe skimm through this thread
https://purifi-audio.com/blog/tech-notes-1/spk16-reference-design-12
Fair enough, but I was thinking of choosing the tweeter myself. Purifi ptt6.5 is also dedicated midbass which requires radiators to produce low frequencies. My wish was not to use these when I will use a bandpass woofer in combination, and the question is whether XO 150Hz is possible.
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I talked to Lars at Munich and he says the surround design is licensed to Dali and not built by Purifi. So don't expect to see a driver like that available from Purifi.
DALI and Purifi owned by the same parent.
Depends on the boss Peter, if there’s a good business case for it.