Exploring Purifi Woofer Speaker Builds

[dave123]

Does anyone know if there will be an eight-inch driver available from Purifi? I'm thinking about making a better LX521 using Bliesma tweeter and 4" Purifi and hopefully an eight inch also from Purifi.

 

[Amplifier dude]

Yes Lars announced it already. Aluminum and paper cone versions in the works.

 

[jamesblonde]

Does anyone know if there will be an eight-inch driver available from Purifi? I'm thinking about making a better LX521 using Bliesma tweeter and 4" Purifi and hopefully an eight inch also from Purifi.

Just bear in mind that the Seas pumps 1,026cm3 of air, within linear p-p limits. Pretty phenomenal. An 8" driver would struggle to match that.

 

[mordikai]

I think he means to replace the lower mid with the Purifi 8" not the woofers.

 

[dave123]

I think he means to replace the lower mid with the Purifi 8" not the woofers.

Right. Subs of LX521 are already great. I'm thinking about replacing 8" drivers with Purifi 8" driver and the four inch as well. I don't if there any better 10/12" subs as an upgrade to LX521 subs.

 

[Octavia]

I've wondered about the Rhythmik 12" open baffle servo drivers as an alternate to the LX521 subs.

 

[Adam Bernau]

Hi guys, just wanted to add my grain of salt to the discussion about Purifi midwoofer in closed enclosure and show you my prototype in progress.
Actually the PTT6.5X04-NAA-08 is working flawlessly in sealed enclosure of 7 liters, and its frequency response and sound are top notch. Hi to @lrisbo and Purifi! <3

 

[agent.5]

Which AMT is that?

 

[xrk971]

Nice work Adam! I did not know that the new woofers are not made of paper anymore? That looks like an aluminum cone witha dustcap. I almost that was a Beyma TPL150H, but it is not. Super looking compact speaker you have.

 

[Adam Bernau]

Which AMT is that?

It is Mundorf AMT 25CS2.1-R in custom made waweguide.

 

[Adam Bernau]

Nice work Adam! I did not know that the new woofers are not made of paper anymore? That looks like an aluminum cone witha dustcap. I almost that was a Beyma TPL150H, but it is not. Super looking compact speaker you have.

Hi, this is the brand new woofer that i got from Purifi people for evaluation and testing in my prototypes, indeed the cone is aluminium, not paper.
https://purifi-audio.com/ptt6-5x04-naa-08/

 

[Snickers-is]

It is Mundorf AMT 25CS2.1-R in custom made waweguide.

Very cool! Have you measured how the AMT performs in the waveguide?

 

[Boden]

Hello Adam,

Could you make a picture of the backside of the new alu cone? Is it folded or supported/damped in any way like the paper cone of the 6.5"?

 

[lrisbo]

Hi guys, just wanted to add my grain of salt to the discussion about Purifi midwoofer in closed enclosure and show you my prototype in progress.
Actually the PTT6.5X04-NAA-08 is working flawlessly in sealed enclosure of 7 liters, and its frequency response and sound are top notch. Hi to @lrisbo and Purifi! <3

Thank you Adam, looks great! /Lars

 

[Adam Bernau]

Hello Adam,

Could you make a picture of the backside of the new alu cone? Is it folded or supported/damped in any way like the paper cone of the 6.5"?

Hello Boden,
of course i can, here you go, see for yourself:

 

[Adam Bernau]

Very cool! Have you measured how the AMT performs in the waveguide?
Hi, thanks. Actually i did just a quick sweep in Arta to see that it is working. Proper on and off axis splice measurements will be done
next week, and i will post them if you like.

 

[Amplifier dude]

Finally someone using these as intended for best results in a sealed cabinet. I'm doing 4l per driver with Linkwitz transform for an F3 of 30hz with 95dB SPL 1m @ 12mm excursion, or F3 of 40hz with 100dB SPL 1m @ 12mm excursion. And sound quality far better than is possible with ported or PR.

However I'm helping a friend tune in a 4x 6.5" 28L sub cabinet this week. Only with 7L per driver you hit full excursion at far less power, and SPL's than 4L. And this 4 layer coil can take a beating.

 

[tktran303]

That’s right Adude. Bigger cabinet more extension, less volts to drive to full excursion.

it’s about tradeoffs

ain’t no free lunch

 

[Adam Bernau]

Finally someone using these as intended for best results in a sealed cabinet. I'm doing 4l per driver with Linkwitz transform for an F3 of 30hz with 95dB SPL 1m @ 12mm excursion, or F3 of 40hz with 100dB SPL 1m @ 12mm excursion. And sound quality far better than is possible with ported or PR.

However I'm helping a friend tune in a 4x 6.5" 28L sub cabinet this week. Only with 7L per driver you hit full excursion at far less power, and SPL's than 4L. And this 4 layer coil can take a beating.

Hi Dude,
exactly, i have built a lot of vented (with passive radiators) and sealed prototypes using Purifi PTT 4 inch and 6.5 inch midwoofers, and i must say that they sure can take beating without a sweat, and i have not found slightest disadvantage with using them sealed, on the contrary. Of course they are demanding powerful amplification, but that is not a problem nowadays. FYI here is my build of flat Dolby Atmos mains in custom home cinema room, where i am using two PTT6.5X08-NFA-01 in 24 liters sealed enlosures behind acoustically transparent screens. Pics were taken before absorbers around them were installed.

 

[Amplifier dude]

That’s right Adude. Bigger cabinet more extension, less volts to drive to full excursion.

it’s about tradeoffs

ain’t no free lunch

You don’t get lower extension in 7l vs 4l. You just get less SPL before xmax