No, 250 Hz 2nd order is fine. I use my PTT6.5M with a 200 Hz 2nd order filter.
Where Lars at, I know he gonna put his diyaudio fans @tktran303 and myself on the advance orders list for these tweeters right? RIGHT?
I apologize if this sounds uneducated but I thought the speaker's was busted until I zoomed in LOL!A thread for discussion on all purifi driver builds.
A place to brainstorm and speculate on drivers and potential speaker builds for arguably, objectively, the best no-nonsense engineering-first traditional speaker drivers' money can buy - If you have a complete project underway, please start your own thread and post a link to it in here. Otherwise posting occasional random progress pics and info here is fine but we will keep full build discussion elsewhere.
We are also pleased to have @lrisbo of purifi occasionally check in and post here of which is much appreciated.
A tweeter is on the way 🤓
Updated 26/01/23: Added more build links and intro - (I may stop updating commercial builds moving forward as they are now coming in thick and fast)
Updated 16/06/22: Added builds and review links, updates to builds
Update 17/03/22: below
Time for a bit of consolidation due to this thread getting some hits, and purifi has now released quite a few scrunchy woofers
Links to known projects & commercial speakers using the Purifi drivers (please PM me if I need to add any)
Of course - www.purifi-audio.com , and the team behind the drivers here
Full DIY:
DIYA user @spresto9 has come up with these beauties with the 8" purifi woofer like to details and more pics HERE
Check out this 4" pocket rocket proof of concept build from the Purifi team - all the info you need to DIY!
Spk8 appnote download (.pdf)
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@lrisbo Proof of concept Purifi SPK4 (superseded) - Passive stand-mount
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@lrisbo Proof of concept Purifi SPK5 - Passive stand-mount - I believe these were at some point being made and sold commercially but have since been discontinued - there may be some floating around second hand market see here Celuaris SPK5 review ASR
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@xrk971 PTT6.5/RS28F Waveguide Harsch XO - Passive stand-mount later evolved into a nice Stand mount and Floor standing Transmission Line
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@Joe Rasmussen Somewhat Legendary 'Elsinore' - Has been given an (expensive) purifi remodeling. Wow. Skip ahead to post #4,746 for the juicy bits.
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Rick Sykora and team's Directiva - Active stand-mount with excellent (objective) reviews, requires external amplification for each driver and an external DSP crossover.
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@xrk971 's Raal 70-20xr and PTT6.5 - this one the tweeter is not readily available to DIYers but there may be ways to get it if you're crafty.
(sorry X, couldnt find a finished pic, and I'm out of attachments for this post)
User tktran303's Collection of DIY designs here looking great
Some mindfood for the 8" - a concept by Purifi.
Paul Carmody's Virage - a full design, light on measurements but a fairly reputable designer.
.....and many more concepts within this thread, start reading. Most not fully documented or taken to finished stage though I suspect a few people are still perfecting their builds before showing them off. Remember you can drop people a friendly private message asking about how their progress is going.
DIY-Kits/Semi Commercial:
Yevgeniy’s PuriWave - 2-way stand mount with dual purifi passive radiators
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Troels Gravesen Purifi 6661 - Semi-passive/Active plate amplified floor-stander
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Troels Gravesen Purifi 6R - Passive bookshelf
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Troels Gravesen Purifi Be - Looks like a revision to the above due to ribbon tweeter supply issues.
hificompass Puri Bliss BeWg - Passive bookshelf - I believe the plans are/were for sale.
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Joseph Crowe's 1198 - I believe you have to get in touch via the webpage - floor-stand transmission line
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Full Commercial:
March Audio Sointuva - arguably where "the bar has been set" for the Purifi 6.5 in a bookshelf chassis.
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Jones Scanlon Baby Reds - self powered studio mixing monitors.
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The Late Rick Craig's Selah Audio Purezza - A nice stand mount ribbon tweeter design, was available commercially but afaik discontinued, check SH market
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Jachim Gerhard Surveyor's - stand-mounts , I believe there is/was a floor-stander made too
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Dennis Murphy & Jim Salk's BePure2 - Floor stander - The legends behind the philharmonic BMR and BMR tower
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and um, what ever this might be! https://www.audiocircle.com/index.php?topic=175599.0 - probably just a concept, I didn't read the thread. Likely Unobtanium tweeters and probably bottomless pockets required, if it is sold commercially.
Correction - the above was a concept which later evolved to the BePure2 - see this thread at AVSForums Post #10,174
https://www.avsforum.com/threads/th...rs-and-discussion-thread.939744/post-61186397
Further Build links:
Thrax Siren - a 2-way standmount
Jern 35 - 2 way standmount
Buchardt A500 Signature - Active 2 way standmount
WVL Serendipity - 2 way standmount
Taipuu Kero L active with FourAudio PPA-1000 dsp amps. - Not sure if available yet
Salk Sound BePure3 ... Holy **** I need to hear these.
Links to independent driver reviews:
https://www.erinsaudiocorner.com/driveunits/purifi_4/
https://www.erinsaudiocorner.com/driveunits/purifi_ptt65w04/
https://www.erinsaudiocorner.com/driveunits/purifi_ptt80x04-nab-02/ - the eight inch aluminum mid-woofer
https://www.erinsaudiocorner.com/driveunits/purifi_ptt6.5x04-naa-08/ - the 6.5 inch aluminum mid-woofer
https://www.erinsaudiocorner.com/driveunits/purifi_ptt6.5m-08-nfa-01a/ - the 6.5 inch dedicated midrange
Also - please consider visiting Erins Youtube Channel and subscribing! - a much needed light in the dark world of audio subjectivism.
https://audioxpress.com/article/tes...udio-6-5-midbass-transducer-from-purifi-audio
https://hificompass.com/en/reviews/purifi-audio-ptt65w04-01a-midwoofer
https://hificompass.com/en/reviews/purifi-audio-ptt40w04-01a-midwoofer
https://hificompass.com/en/reviews/purifi-ptt65w08-01b-ptt65x08-nfa-01
https://hificompass.com/en/reviews/purifi-ptt65m08-nfa-01a-65-true-midrange
http://www.troelsgravesen.dk/Purifi.htm
Original Post 02/04/2020:
With the group buys well underway the idea was bought up that a design thread be started to discuss build options.
Mine have arrived but I have no build materials and will not be able to get any until we come out of quarantine in (hopefully) three weeks time. I planned to start with a hybrid of purifi's SPK4/5 builds using the same AMT tweeter but maybe using a slot port with the 2.5khz crossover. That and I haven't done any AMT builds so it seemed like a good place to start.
I read of a guy in Aus planning on doing a line of passive and active speakers with the woofer so be interesting if he could chime in here.
So with no materials for the next at least 3 weeks, what better time to discuss build options! Fire away
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What impedance are those voice coils? The the wire looks huge!
Did you make a request? I put in a request about 3 months ago and just got mine on Friday.
@Mainframe wins for first to post to this thread the new CLC.Audio Purifi speaker being teased by Gato Audio gato-audio.com.
https://www.instagram.com/gatoaudio/reel/DG1Tb9fsC7A/ https://www.instagram.com/gatoaudio/reel/DGqHwGtNVJg/
A close look at the Instagram posts and I think I see where the first production Purifi tweeters are going.
And yes cush man the wire on Purifi voice coils looks 'huge!' because it is. The trick multi-layers at differing lengths in 4 or 8 ohm nominal impedances is one part of the Purifi secret sauce.
https://www.instagram.com/gatoaudio/reel/DG1Tb9fsC7A/ https://www.instagram.com/gatoaudio/reel/DGqHwGtNVJg/
A close look at the Instagram posts and I think I see where the first production Purifi tweeters are going.
And yes cush man the wire on Purifi voice coils looks 'huge!' because it is. The trick multi-layers at differing lengths in 4 or 8 ohm nominal impedances is one part of the Purifi secret sauce.
@paco de colonia reminded me that I never reported back on my build. Painting is done.
Over the holidays, I tried adding some fluff materials in the subs (I tried Visaton's). It just seemed to slow the sound a bit. And REW was not showing me anything clearly better. In the end I added GR’s NoRez2 to the inside of the sub cabinets. This did not do too much. Between 100 and 200 Hz is a little flatter now according to REW. Basically the 28mm MDF was already pretty solid.
My big problem at 65Hz was totally a room mode issue too. According to the Hunecke.de calculator, my room is very dead at that frequency. I dialed this in on REW and walked around the room with a mic. It was obvious.
A bunch of really big GIK absorbers placed along the front wall behind the speakers helped a lot. Good weather means I can open the windows now too. That makes for the biggest room mode improvement.
Over the holidays, I tried adding some fluff materials in the subs (I tried Visaton's). It just seemed to slow the sound a bit. And REW was not showing me anything clearly better. In the end I added GR’s NoRez2 to the inside of the sub cabinets. This did not do too much. Between 100 and 200 Hz is a little flatter now according to REW. Basically the 28mm MDF was already pretty solid.
My big problem at 65Hz was totally a room mode issue too. According to the Hunecke.de calculator, my room is very dead at that frequency. I dialed this in on REW and walked around the room with a mic. It was obvious.
A bunch of really big GIK absorbers placed along the front wall behind the speakers helped a lot. Good weather means I can open the windows now too. That makes for the biggest room mode improvement.
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In surround sound mode, the subs only get the LFE feed duplicated. The tops then receive full-spectrum front left-right channels. So they have to be able to dig for surround sound.
sorry to ramble on, but the problem is that you have it without reinforcements, MDF is also a material that has the ability to "inflate" a little and it doesn't create much bass. Plywood and horizontal and vertical struts are better. It's very punk (I apologize for the bit of truth 🙂
but a very good attempt with good speaker drivers
the reinforcement should be around the entire perimeter, all the inner walls must be reinforced. The foam is also not the best because it doesn't work much for bass, it eats up higher frequencies, but you have it as a subwoofer. Or you can set it in DSP. But when you play with such expensive and good speakers, pay a little attention to it. With such different speakers, every trick will be rewarded many times over