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PURIFI finally did a fully purified passive speaker design! The SPK 16 prototype is here - with a PTT tweeter

Finally someone who takes edge diffraction serious! :D
So manny speakers have sharp edges (like these great new KEFs - the best Coaxes with Genelec Ones) - it simply makes no sense ...
 
IamJF said:
Finally someone who takes edge diffraction serious! :D
So manny speakers have sharp edges (like these great new KEFs - the best Coaxes with Genelec Ones) - it simply makes no sense ...
Click to expand...
Where are those sharp edges you complain?

IMG_3993.jpeg
 
thewas said:
Since the 8th generation of the KEF Uni-Q this is achieved on the upper treble with its tangerine waveguide.
uk.kef.com

What Is Uni-Q Technology? | KEF UK

Explore KEF's Revolutionary Uni-Q Technology, providing unparalleled audio precision to deliver immersive sound experiences for your home.
uk.kef.com uk.kef.com
Click to expand...
I would also like to add that KEF has a much larger part around the tweeter built as a fixed "cup" rather than part of midrange diaphragm compared to usual coaxial designs, which may have helped alleviate the on-axis scrap we see so much on co-ax drivers. They probably patented this as a part of the tangerine waveguide though.
We might be getting a bit ahead of ourselves here, but if purifi were to make a co-ax I think they may need to use a non-ribbed surround on the diaphragm for, well, maintaining a smooth profile for the waveguide, and that could have some less-than-optimal performance implications on the mid driver, so there'll definitely be more challenges along the way than singular driver(s).
 
mglobe said:
I read that as a separate product being announced.
Click to expand...

They have been teasing this tweeter for a long time now. Good to see something tangible finally!
 
Nice to see March Audio being the partner building the prototype and working directly with Purifi on this!
 
Ra1zel said:
Okay I'm impressed by the drivers and design and all but also a bit skeptical about super low directivity/high dispersion all the way to 20k Hz. Now the in room response will be flat, if not enough absorbing surface is used in the room, instead of downward sloping. According to Harman findings in blind test listeners vote such speakers as too bright and have lower preference vs downward sloping.
Click to expand...

IMO the only real effect of wide top octave dispersion is expansion of the sweet spot. Reflections aren't really an issue due to air absorption and head shadowing. But the direct sound is more consistent across a wider area, hence the wider sweet spot.

Can you point me to that Harman research? After all, some of their most popular monitors (JBL 7-series) have wide and constant dispersion through the top octave. They do poorly on the "preference score" as a result, but Harman obviously released them anyway.

This tweeter looks really impressive. Honestly it's the first since the aforementioned JBL 7-series driver/horn that has my attention as a real potential advance of the art.
 
jhaider said:
IMO the only real effect of wide top octave dispersion is expansion of the sweet spot. Reflections aren't really an issue due to air absorption and head shadowing. But the direct sound is more consistent across a wider area, hence the wider sweet spot.

Can you point me to that Harman research? After all, some of their most popular monitors (JBL 7-series) have wide and constant dispersion through the top octave. They do poorly on the "preference score" as a result, but Harman obviously released them anyway.

This tweeter looks really impressive. Honestly it's the first since the aforementioned JBL 7-series driver/horn that has my attention as a real potential advance of the art.
Click to expand...
About the downward sloping, what we see in that preference Harman curves is not a target but a result as Dr Toole repeats again and again.
And makes sense,only the air absorbent over distance is enough to justify that result.
It's wrong to deliberately aim for that as a target.
 
March Audio have a new speaker, too. It appears to use the same mid-woofer as this SPK16, but the tweeter from the Sointuva. March speaker cabinet radii are smaller than those on the SPK16, but there is some resemblance.
 
theREALdotnet said:
March Audio have a new speaker, too. It appears to use the same mid-woofer as this SPK16, but the tweeter from the Sointuva. March speaker cabinet radii are smaller than those on the SPK16, but there is some resemblance.
Click to expand...
The Ukkonen looks like it uses an 8 inch Purifi woofer.
The SPk16 uses the 6.5 inch woofer; also mentioned multiple times in the article.
I think that tweeter waveguide may be smaller on diameter than the SB Acoustics one
 
thewas said:
Since the 8th generation of the KEF Uni-Q this is achieved on the upper treble with its tangerine waveguide.
uk.kef.com

What Is Uni-Q Technology? | KEF UK

Explore KEF's Revolutionary Uni-Q Technology, providing unparalleled audio precision to deliver immersive sound experiences for your home.
uk.kef.com uk.kef.com
Click to expand...
Right, forgot about that one, however surely its not that easy to copy
 
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