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

[Lars Risbo]

Hi Lars,
Did he reported about the feeling of listeners? It was like a test?
If the tweeter is so good as your ushindi PTT 8 on my March Audio Ukkonen and your purifi power modules… no doubt.

hi, it was actually a reply comment on a post March made in our facebook group. it reads :

Lars Risbo we have unfortunately been suffering from so much noise from the theatre demo's going on in the room next door that it has impaired our own demonstrations.
For the last day of the show we are moving to a different room so we will be able to get much better feedback on the new Kuoro speaker.

What we can say is that people have noticed and liked the sense of "realism" your new tweeter provides. It is always difficult to express what these subjective observations are, but you know when you hear a brass band (salvation Army) live in the street, there is a sparkle to the high frequencies that rarely gets captured (or is it replayed?) by recordings? Well, the new tweeter does replay this .
Cheers
Alan

 

[Dennis Murphy]

hi, it was actually a reply comment on a post March made in our facebook group. it reads :

Lars Risbo we have unfortunately been suffering from so much noise from the theatre demo's going on in the room next door that it has impaired our own demonstrations.
For the last day of the show we are moving to a different room so we will be able to get much better feedback on the new Kuoro speaker.

What we can say is that people have noticed and liked the sense of "realism" your new tweeter provides. It is always difficult to express what these subjective observations are, but you know when you hear a brass band (salvation Army) live in the street, there is a sparkle to the high frequencies that rarely gets captured (or is it replayed?) by recordings? Well, the new tweeter does replay this .
Cheers
Alan

I've been working with the new tweeter in a smallish 2-way paired with the SB Acoustics 5" Ceramic driver crossed at 1300 Hz. Thanks to the combination of broad dispersion and controlled directivity, the sound is virtually identical to my 3-way BMR monitor unless there is a lot of content below 50 Hz. I'm not sure what I'm going to do with the design, but I can say that the tweeter performs as advertised.

 

[RickS]

The 2-year anniversary of this post came and went this past Friday and still cannot buy one.

So, feel inclined to ask: Where's the tweet?

 

[Lars Risbo]

hey Rick, we just sent the last round of emails to finish the wait list and Thursday we launch it on the web shop.

cheers

Lars

 

[RickS]

hey Rick, we just sent the last round of emails to finish the wait list and Thursday we launch it on the web shop.

cheers

Lars

Thanks Lars! Good to hear. Will check later this week.

 

[adriano93]

Really nice
PTT1

@Lars Risbo
Is there also a date for SPK16 release?

 

[RickS]

Really nice
PTT1

@Lars Risbo
Is there also a date for SPK16 release?

Better be for over $500!

Wonder how much will the large waveguide variant be?

 

[kharan]

Interesting cabinet, I'm curious as to how it measures.

https://imgur.com/fdSwjCV

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[RickS]

Interesting cabinet, I'm curious as to how it measures.

https://imgur.com/fdSwjCV

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While Purifi amplifier EVAL kits are readily used in consumer applications, the speaker kits are packaged more like engineering prototypes. As in the pics, you can see the crossover on the floor. This allows great flexibility for design activities but is less than ideal in a home setting. Does not appear the cabinet design shown would allow space to mount the crossover internally.

 

[Lars Risbo]

hi, we are still fine tuning the xover so external is practical as mentioned. There is space and mounting studs for the xover internally. The box is a variation over the Spk16 box - same volume and rounding. Should share the filter or be very close.

cheers

Lars

 

[kharan]

I'm mostly interested in seeing how the bottom rounding affects diffraction and how it looks like on the measurements, it's the first time I've seen it though I suppose the midrange driver on the B&W 800s is kind of similar in that they don't "see" a lot of enclosure.

 

[ErinPraline]

Will you be sending a finished unit to Amir once it's finalized?

 

[RickS]

I'm mostly interested in seeing how the bottom rounding affects diffraction and how it looks like on the measurements, it's the first time I've seen it though I suppose the midrange driver on the B&W 800s is kind of similar in that they don't "see" a lot of enclosure.

As Lars indicates, the cabinet shown in the pics is a SPK16 variant. The cabinet in the reference design paper is less rounded. If you look at that design, it has matrixed bracing and is why I questioned space for the crossover.

 

[Fidji]

hi, we are still fine tuning the xover so external is practical as mentioned. There is space and mounting studs for the xover internally. The box is a variation over the Spk16 box - same volume and rounding. Should share the filter or be very close.

cheers

Lars

My understanding was that SPK16 is more a technology demonstrator and there was not intent to sell it as finished speaker.

 

[Lars Risbo]

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.

 

[Reddoc]

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.

Dear Cousin Lars,
.......

 

[Lars Risbo]

Maybe I have more family than I thought

 

[Kravi4ka]

Dear Cousin Reddoc (a cousin of a cousin is a cousin, right?)

….



Please, in this day and age you won’t stop a crazy DIYer, have mercy, give us the plans for the SPK16FFF(for family and friends )

 

[dfuller]

I heard from James at PDP that he's been playing with the Purifi tweeter.

 

[Lars Risbo]

I'm mostly interested in seeing how the bottom rounding affects diffraction and how it looks like on the measurements, it's the first time I've seen it though I suppose the midrange driver on the B&W 800s is kind of similar in that they don't "see" a lot of enclosure.

the comsol sims indicate the difference from the spk16 is small. Also confirmed by the preliminary measurements