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

[objectgroup]

cousin @Lars Risbo
now that the spk16 is close, is it crazy to ask for a cardioid sub base for it?

 

[Lars Risbo]

not a bad wish. need to go full active then.

BTW esteemed ASR member @mocenigo joined a casual after show hours listening on the Spk16 with latest tweeter and 9040 amps. Maybe he can offer a testimony.

 

[mocenigo]

not a bad wish. need to go full active then.

BTW esteemed ASR member @mocenigo joined a casual after show hours listening on the Spk16 with latest tweeter and 9040 amps. Maybe he can offer a testimony.

I already did https://audiosciencereview.com/foru...w-purifi-amplifiers-coming.34210/post-2313350

Of course all caveats apply — the room was far from perfect, and most the rooms at the Munich Hiend were actually even worse, at least that was an actual room and not a temporary cubicle or a room under a tilted ceiling, so comparisons cannot really be done etc etc.

But I want to underline one aspect, there was nothing spectacular except ... for the way it sounded natural, and also in non-centered positions. That was, in fact, spectacular. It seems that Lars Risbo and Carsten Tinggaard's idea of a good speaker and mine are similar: wide dispersion, wide and flat extension, no range emphasized in any way — resulting in an "unspectacular" sound with a relatively large sweet spot. I designed my own speakers following similar principle. I do not claim to be as good as Lars and Carsten, maybe I am better (LOL, no).

During the last few years I already heard a couple of iterations of the SPK16 (first with the little AMT, then with the Purifi tweeter prototype, and now with a pre-production of the larger waveguide) and each version improved on the characteristics I appreciate. It sounds the way I want my speakers to sound.

If you prefer hyperanalytic sound in a tiny sweet spot where you cannot move your head without hearing artifacts, then this is not for you — I understand some audiophiles actually prefer that, esp. if the treble is emphasized.

As for the amplifiers, well, the 1ET9040BA is a second generation Eigentakt, I am sure it is technically better than my 1ET400A build, but I doubt I would be able to hear differences, either with the SPK16 or with the three top ways of my speakers. I would probably only hear less hiss when in immediate proximity to the woofers of the ripoles since I am driving them separately with a Hypex Fusion amp and the gain must be very high. But in any case I would probably not use a second pair of 1ET9040BA's to drive them. — Of course I want it (and the new discrete buffer!) but my wife would kill me.

 

[JanRSmit]

Makes my waiting more and more painful

 

[Penelinfi]

I'll be interested in seeing how this compares to the March Audio Sointuva. Or rather would love to hear it. Hopefully could customise the finish

 

[Ktacos]

I expected the tweeter to be expensive, but not THAT expensive. Holy moly.

 

[kemmler3D]

I expected the tweeter to be expensive, but not THAT expensive. Holy moly.

Yeah, can't say Purifi is known for sheer affordability in the first place, but that's a lot for a tweeter. On the other hand, it looks extremely well behaved up to 13khz, dispersion is super wide for most of the range, and it looks like you can cross it super low if you want. Call me crazy but it looks like it was built to cross over to the other purifi drivers and maintain wide / smooth dispersion for the full range.

I think if you are doing a "spare no expense" DIY build, paying >$500 for a tweeter is definitely on the high end, but it's not vastly more than people sometimes spend on Morel or similar.

 

[mocenigo]

I expected the tweeter to be expensive, but not THAT expensive. Holy moly.

My tweeters (actually, from 1.2khz upwards) are Beyma TPL150H, and I even modified them to get a very flat response. They have similar dispersion horizontally as the Purifi tweeters but not vertically.

The Purifi tweeters require no mods, have a good dispersion in any direction, and are less extended to the bottom. They are way more compact.

They cost about the same. I find it fair.

 

[berjine]

Yes the price makes sense to me, it's on par with the high-end Bliesma, Satori, Seas, etc

 

[BKr0n]

SPK16 (wooden box with heavy matrix) is a reference design and we publish the build plan once finished. The box from the show is a variant designed as a passion driven skunk works project and will be made for shows, family and friends. Both boxes allow internal xover.

A few questions if you don't mind;

• For clarity, do you mean that the design has yet to be released (after finishing the paper I was really hoping one would be there )?
• Is the 1.0 not complete then? Or is it just not the final version of it?
• Which model will be available? Or will both/all be available?
• Will this design be available to the public? Or only OEMs?
• Will there be a CAD model available as well?

As an aside, congrats on the release of your tweeter! Looking at the spec sheet, you guys really made something special

 

[Valhalla]

How the new PURIFI PTT1.3T04-HAG-01 Dome Tweeter compares to BelisMa T34B-4 Beryllium Dome tweeter? Is there any substantial difference taking acoustic performance into consideration? Any idea?

 

[IamJF]

Purifis tweeter has a wide and controlled radiation to even very high frequencies with it's special waveguide.
T34B has about the same off axis behaviour as a 25mm tweeter + wide surround, maybe a little more narrow. When you want wide and even behaviour you need T34A which has exceptional off axis behaviour at high frequencies, better as most 25mm tweeters.
Both Bliesmas have their membrane resonance higher.

 

[Lao Lu]

New March Audio speaker might beat AsciLab to market:

New Kuoro Speaker​

We are very proud to announce the release of our new Kuoro speaker. Kuoro uses the new Purifi PTT1.3 tweeter and 2 Purifi PTT6.5 aluminium cone woofers. The tweeter has a constant and wide directivity providing an amazingly spacious sound with incredibly "real" sounding high frequencies. The two woofers create amazing bass extension and dynamics with the lowest distortion.

The Kuoro will debut at the Australian HiFi show in April. More details below.

2-way...or 2.5?

 

[Digital_Thor]

How the new PURIFI PTT1.3T04-HAG-01 Dome Tweeter compares to BelisMa T34B-4 Beryllium Dome tweeter? Is there any substantial difference taking acoustic performance into consideration? Any idea?

I would choose the T25B instead and put it in an Augerpro waveguide, since it loads it very well and is a much easier combi with most midranges at a lower cross-over frequency.
https://www.somasonus.net/bliesma-t25b
The T34B is great, but consider the higher price and whether you actually need the extra performance.

 

[Lars Risbo]

A few questions if you don't mind;

• For clarity, do you mean that the design has yet to be released (after finishing the paper I was really hoping one would be there )?
• Is the 1.0 not complete then? Or is it just not the final version of it?
• Which model will be available? Or will both/all be available?
• Will this design be available to the public? Or only OEMs?
• Will there be a CAD model available as well?

As an aside, congrats on the release of your tweeter! Looking at the spec sheet, you guys really made something special

thanks! status is we did good measurements on the show model and optimised a new filter using an upgraded Matlab tools. Sounds quite stunning now. We have the 147mm waveguide in quantities now and work on the data sheet for release.

the current plan is to release a build description of the wooden spk16’s and sell the drivers as a package. will include drawings, schematic etc. maybe do a pcb for the filter.

In addition, we look at selling the cabinet parts for the red show model (marble composite ). Acoustically very close to the wooden box.

 

[Grotti]

thanks! status is we did good measurements on the show model and optimised a new filter using an upgraded Matlab tools. Sounds quite stunning now. We have the 147mm waveguide in quantities now and work on the data sheet for release.

the current plan is to release a build description of the wooden spk16’s and sell the drivers as a package. will include drawings, schematic etc. maybe do a pcb for the filter.

In addition, we look at selling the cabinet parts for the red show model (marble composite ). Acoustically very close to the wooden box.

Looks very promising!!! I would appreciate if you could offer completely assembled crossovers too like Audiofirst does. Can you estimate how long it will take you to offer the DIY kit?

 

[Lars Risbo]

we will at least design a PCB for the filter and consider a fully assembled version too.

 

[VeerK]

thanks! status is we did good measurements on the show model and optimised a new filter using an upgraded Matlab tools. Sounds quite stunning now. We have the 147mm waveguide in quantities now and work on the data sheet for release.

the current plan is to release a build description of the wooden spk16’s and sell the drivers as a package. will include drawings, schematic etc. maybe do a pcb for the filter.

In addition, we look at selling the cabinet parts for the red show model (marble composite ). Acoustically very close to the wooden box.

Very much a fan of these ideas, including the cabinet parts. Cannot wait to get my hands on them.

 

[adriano93]

we will at least design a PCB for the filter and consider a fully assembled version too.

That's great news. Is an active version also planned for Hypex modules, for example?

 

[Halbknapp]

That's great news. Is an active version also planned for Hypex modules, for example?

I assume purify could without too much effort add the settings needed for Hypex and for example minidsp to the documentation. The modules would need a separate compartment however.

And in addition you may still want to use a parallel notch in series to the woofer to tame the resonance and propably one for the tweeter too, even if going active.

But in general it is much more complicated to get a passive system right. Getting the same response active is easier to model.