Hi all, here in Europe there is at least one shop where i could pull the spec sheet
https://doc.soundimports.nl/pdf/brands/purifi/PTT1.3T04-HAG-01/PTT13T-HAG-01-Datasheet.pdf
The application information is good, never seen something so good explained from other vendors
So far - so good, Stefano
P.S.: this is the hint that VituixCAD is becoming a quasi standard even in the industry
https://doc.soundimports.nl/pdf/brands/purifi/PTT1.3T04-HAG-01/PTT13T-HAG-01-Datasheet.pdf
The application information is good, never seen something so good explained from other vendors
So far - so good, Stefano
P.S.: this is the hint that VituixCAD is becoming a quasi standard even in the industry
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Vituix isn't at this stage being used to show polars. I'm curious how listening window came to be chosen and note that much of that energy is less likely to be involved in early reflections.
Just because one specific manufacturer is using it? 🤨🧐
There are a ton of other companies out there, some being around for I think more than 100 years at this point.
VituixCAD is being used by a lot of companies, but I don't see why to call it "a standard".
It's one of the many great tools out there.
I personally would have liked a tweeter without a face-plate, so the user can choose the waveguide for it.
I also find it A LOT of money for so little practical improvement compared to other tweeters.
But I guess when money is no issue, sure why not.
Only if we talk about such small specific details, a proper waveguide for the job (or rather the mismatch) has a much bigger impact.
That being said, it's miles better compared to other HF transducers in the same price category.
Where proper behavior, off-axis response and directivity seems to be less than a afterthought in some cases.
To unfortunate about the nasty breakup that has to be fixed with a passive filter.
I am glad you like the info. I don’t think the CAD software needs to be a standard. It’s more important to have standards for file formats to exchange response data into CAD programmes.
We show features and tricks using VCAD internally blog posts and coming data sheets. But again, these things are also possible in other tools.
But yes, we like using VCAD internally and have a good dialogue with Kimmo about fixing details and new features etc. In addition we use our internal tools that run in Matlab and we have made them compatible with VCAD.
Cheers
Lars/Purifi
PS: the data sheet has been available in our web shop since may 15th
We show features and tricks using VCAD internally blog posts and coming data sheets. But again, these things are also possible in other tools.
But yes, we like using VCAD internally and have a good dialogue with Kimmo about fixing details and new features etc. In addition we use our internal tools that run in Matlab and we have made them compatible with VCAD.
Cheers
Lars/Purifi
PS: the data sheet has been available in our web shop since may 15th
I believe it was stated at ASR that there will be different waveguides to choose from (eventually). Not sure about a face-less version. Given that Lars @lrisbo just replied in this thread, maybe he will expand (or correct me if I am mistaken).
There are already speakers out there with a custom waveguide for it. So no worries about that.
we have a 147mm slightly deeper waveguide option coming and we expect to sell tweeters without waveguide too (but i suspect only to OEMs)
^This. We really need a wider variety of tweeters with larger waveguides. The speaker world just does not need another high end 104mm faceplate tweeter...
Why would we need to "fix" a membrane breakup in the 20-30 kHz area?
Do humans have the ability to hear that frequency region?
Do the most common 44,1 kHz sample rate audio formats extend to that frequency range?
@lrisbo I want to commend PURIFI for providing detailed data sheets with application notes and commentary on the design considerations. I’m surprised so few manufacturers do this. I don’t believe a speaker (or any other engineering design) simply exists as a set of specifications. There is often a thought process and design philosophy… Or at least there should be. A white paper is a manifesto on how a problem should be solved, and your company expressing its distinct point of view is refreshing.
All the companies should make serious DS like this one. Two tones IMD ... I'd like to see this everywhere too.
I don't understand the LR4 of the picture, though. Acoustical ? Is the notch a part of it or only there to notch the high end break-up ?
I don't understand the LR4 of the picture, though. Acoustical ? Is the notch a part of it or only there to notch the high end break-up ?
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Acoustical means that the combined filter and tweeter response from voltage to sound pressure is targeting a 4th order LR response. The notch is part of the necessary EQ to target this acoustic response
that is exactly the good question. we did experiment with turning the notch on and off and my colleagues were debating if it was audible at all.
thanks, , so the electrical third order with the notch in the vinicity and the natural low end roll off of the unit act like an LR4. You should write it for the noobs.
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Does the gasket have any appreciable thickness when fully compressed? In other words, if the counterbore (rebate) for the faceplate is exactly the thickness of the faceplate, will there be an audibly significant step between faceplate and baffle?
good question. the gasket will have a finte thickness when compressed. otherwise the screw pull might bend the faceplate or tear out the thread inserts in the box etc. From memory we let the gasket compress in the order of 0.5mm. On spk16 we also add some 3D printet TPU grommets to add some soft decoupling of the screws. no need to pass vibrations to all of the box.
the electrical filter including notch plus the tweeter response combines to a LR4 response.
Physically possible causes for audibility would be subharmonic distortion and intermodular distortion. But again, that would require that the membrane breakup is even excited - which it is not, considering it's outside of the frequency spectrum of music / outside of the frequency range of common audio formats. Harmonic distortion & IMD can excite the breakup, but that's at worst in the single digit percent, and usually in the fractions of a percent. So, really not feasible that there's something audible about it.