NEW PURIFI 8'' MWoofer [PTT8.0X04]

[jhaider]

Sorry he don't post in english, but if you want to find him in dcinside nickname is 나무늘보5

View attachment 273237

Interesting phase plug on that WG. I don't know that I've seen a long driver with phase plug in front of it.

Is that a commercially-available WG or proprietary to this finished speaker?

 

[sloth_kwj]

Interesting phase plug on that WG. I don't know that I've seen a long driver with phase plug in front of it.

Is that a commercially-available WG or proprietary to this finished speaker?

That waveguide was designed by Lars Risbo for Purifar's new 8" demo. It used Mundorf AMT tweeters and was optimized using COMSOL. I don't know if this will be a public design like the SPK5,8, but it hasn't been released yet.

 

[Positivevibrations]

I’m getting response flat down to 20hz with only 6dB boost in 7L sealed with these 8’s. Not bad!

 

[Positivevibrations]

I’ll also add that this 8” obsoletes the 6.5” for me in a 2 way.

 

[D!sco]

Very nice! What’s the crossover look like? Are the 8’s wired up to be 12 ohm that way?

 

[Positivevibrations]

Very nice! What’s the crossover look like? Are the 8’s wired up to be 12 ohm that way?

Thanks!

It’s fully active 3.5 way. Upper woofer crosses over to the Bliesma mid @600hz, and runs all the way down until it naturally rolls off. Bottom 2 woofers crossover at 300hz and 6dB of boost is applied with room correction to achieve an in room response flat down to 20hz. All linear phase 4th order crossovers. A custom plate installs in the back with Hypex NCx500 amps for each driver, and a MicroAudio Cobra power supply with Mundorf caps to power them. For DAC is an in house design based on very new chip from ESS. No DAC’s on the market using it yet. SINAD up to 10v output here (0dBfs is 10v):

For digital interface I’m using Dante over fibre optic cable so they can be clock synced to unlimited other speakers.

 

[Positivevibrations]

'Cause purifi modified tweeters were so good, purifi made ones will undoubtedly be the new SOTA.

TMI, I have t25d&m74a pair but will change when puri-tweets launches

I’ll be trying the same. As nice as the Purifi‘s sound in the mids, running beryllium domes from 600hz up is no comparison. Makes the Purifi mids sound like cotton is in the ears in comparison. I’d be shocked if Purifi will be able to match or beat the 34mm Bliesma‘s with an aluminum dome. However with the special dome geometry maybe it’s possible.

 

[abdo123]

I’ll be trying the same. As nice as the Purifi‘s sound in the mids, running beryllium domes from 600hz up is no comparison. Makes the Purifi mids sound like cotton is in the ears in comparison. I’d be shocked if Purifi will be able to match or beat the 34mm Bliesma‘s with an aluminum dome. However with the special dome geometry maybe it’s possible.

The radiation is probably a lot wider as well.

 

[Positivevibrations]

The radiation is probably a lot wider as well.

Yes the sound stage those speakers throw is beyond anything I’ve ever experienced. And the footprint is only the size of a stand mount monitor. They’re only 40” tall 11” deep, and 10” wide. And that includes all the electronics. Just feed them AC and a thin fibre optic Ethernet cable. The only connections on the rear plates.

 

[boXem]

For DAC is an in house design based on very new chip from ESS. No DAC’s on the market using it yet. SINAD up to 10v output here (0dBfs is 10v):

Something is wrong with this curve.

 

[Positivevibrations]

Something is wrong with this curve.

Why?

 

[boXem]

Why?

A THD+N vs level curve is not flat.

 

[Positivevibrations]

A THD+N vs level curve is not flat.

Yes because it varies a bit at different output levels. Which is normal for any dac. The opamps start working hard as they approach 10v, and performance suffers a bit. Something you don’t see from most dacs when you only measure up to 4v output. Not an issue for this application though as the dac won’t be required to output more than 4v.

 

[boXem]

Yes because it varies a bit at different output levels. Which is normal for any dac. The opamps start working hard as they approach 10v, and performance suffers a bit. Something you don’t see from most dacs when you only measure up to 4v output. Not an issue for this application though as the dac won’t be required to output more than 4v.

You are looking at the THD, I am looking at the N

 

[Positivevibrations]

You are looking at the THD, I am looking at the N

Well Dustin Foreman the head engineer at the ESS Sabre division took that sweep. You may need to shoot him an email and school him on how to run his AP. My gear can’t measure that good.

Dustin Forman Inventions, Patents and Patent Applications - Justia Patents Search

USPTO patent applications submitted by and patents granted to Dustin Forman

patents.justia.com

 

[boXem]

Well Dustin Foreman the head engineer at the ESS Sabre division took that sweep. You may need to shoot him an email and school him on how to run his AP. My gear can’t measure that good.

I seriously doubt that Mr. Foreman would publish such a plot. But don't worry Mike, I will let you continue spreading your BS all over. None of my business.

 

[Positivevibrations]

I seriously doubt that Mr. Foreman would publish such a plot. But don't worry Mike, I will let you continue spreading your BS all over. None of my business.

Oh looks like I forgot the bottom of the page

 

[boXem]

Oh looks like I forgot the bottom of the page

View attachment 305402

Oh, looks like you published somebody's measurement of some gear stating it was your gear.

 

[Positivevibrations]

Oh, looks like you published somebody's measurement of some gear stating it was your gear.

We are using the exact same circuit, with the exact same parts, exact same layout with the PCB manufactured at the exact same factory. It maxes out my gear, and allows the NCx500’s to reach datasheet specs. Transparent enough for me.

How does the dac in your active speakers measure?

 

[egellings]

View attachment 210569

Why does the front suspension annulus have that texture in it?