Starting this thread for discussions and reports on systems using Purifi Audio’s (https://purifi-audio.com/) groundbreaking loudspeaker drivers.
This blog post is a good introduction to the technology that led me to pursue Purifi’s drivers:
I presently have a system I call Fi16v1 (Purifi drivers in 16 liter enclosure version 1) using PTT6.5W04 woofers (one per speaker), PTT6.5PR passive radiators (two per speaker), and Fountek CD 2.0 ribbon tweeter. Crossover is external and should not even be considered a preliminary design. It is repurposed from my NT10 design as a stand in while drivers are measured and Fi16 crossovers (both passive and active) are designed. DSP in JRiver music player software was used to correct the 8.5 dB difference in sensitivity between woofer and tweeter.
First off a recommendation for and thanks to SMJ Audio http://www.smjaudio.com/ without whose help I would be staring at the Purifi drivers in their cardboard boxes rather than enjoying listening to them. I had a 16 liter box that could be repurposed for this project but the pandemic had closed off my access to CNC and choked off time to cut required baffles manually. Steve Manning to the rescue, just look at the fantastic Birch ply baffles with threaded inserts he created off my drawings. The 3D render is Steve’s he created using my 2D drawings to verify we were on the same proverbial page.
The PTT6.5W04 seen test fitting Steve’s CNC programming skills is there for a SMJ Audio project I await with anticipation.
Here is the Fi16v1 bass alignment simulation from UniBox. Before snarking it will ‘only’ do 98 dB bass at 30 Hz note this is from a 15” H x 8.5” W x 10.75” D box.
Next a drawing of the Fi16. The front and side views showing a dome tweeter reveal this box’s origins from my NT10 design shown at Lone Star Audio Fest in 2018 and 2019. I realized by converting the false back to a windowed brace I would get the 16 liter volume this alignment calls for and the PRs just fitting on the rear. The selection of the Fountek CD 2.0 ribbon tweeter is also a pandemic constraint, I have owned this pair for years and they were rescued from gathering dust in the garage to provide a first listen.
And the as-built. For these prototypes the finishing was shortcut by the arrival of the drivers from Denmark. The stain + single coat of poly finish will be eventually be upgraded to veneer and high gloss epoxy. That may take a while given how much I am enjoying listening to these in their present state.
The summary of listening reaction is:
First reaction to hearing the Purifi woofers is to be stunned at the quantity, depth, and quality of the bass they reproduce.
Second reaction is to become aware that through the midrange and on up to the hand off to your tweeter transparency, clarity, and dynamic ‘jump’ are by a large margin better than anything I have heard from a 6” – 8” driver. The only other times I have experienced this level of hear into the performance with so many musical details and textures and tones revealed is from 7’ tall line arrays or big horns at the level of Volti Audio.
The following two links are to more detailed listening impressions I posted on diyaudio.com.
This blog post is a good introduction to the technology that led me to pursue Purifi’s drivers:
I presently have a system I call Fi16v1 (Purifi drivers in 16 liter enclosure version 1) using PTT6.5W04 woofers (one per speaker), PTT6.5PR passive radiators (two per speaker), and Fountek CD 2.0 ribbon tweeter. Crossover is external and should not even be considered a preliminary design. It is repurposed from my NT10 design as a stand in while drivers are measured and Fi16 crossovers (both passive and active) are designed. DSP in JRiver music player software was used to correct the 8.5 dB difference in sensitivity between woofer and tweeter.
First off a recommendation for and thanks to SMJ Audio http://www.smjaudio.com/ without whose help I would be staring at the Purifi drivers in their cardboard boxes rather than enjoying listening to them. I had a 16 liter box that could be repurposed for this project but the pandemic had closed off my access to CNC and choked off time to cut required baffles manually. Steve Manning to the rescue, just look at the fantastic Birch ply baffles with threaded inserts he created off my drawings. The 3D render is Steve’s he created using my 2D drawings to verify we were on the same proverbial page.
The PTT6.5W04 seen test fitting Steve’s CNC programming skills is there for a SMJ Audio project I await with anticipation.
Here is the Fi16v1 bass alignment simulation from UniBox. Before snarking it will ‘only’ do 98 dB bass at 30 Hz note this is from a 15” H x 8.5” W x 10.75” D box.
Next a drawing of the Fi16. The front and side views showing a dome tweeter reveal this box’s origins from my NT10 design shown at Lone Star Audio Fest in 2018 and 2019. I realized by converting the false back to a windowed brace I would get the 16 liter volume this alignment calls for and the PRs just fitting on the rear. The selection of the Fountek CD 2.0 ribbon tweeter is also a pandemic constraint, I have owned this pair for years and they were rescued from gathering dust in the garage to provide a first listen.
And the as-built. For these prototypes the finishing was shortcut by the arrival of the drivers from Denmark. The stain + single coat of poly finish will be eventually be upgraded to veneer and high gloss epoxy. That may take a while given how much I am enjoying listening to these in their present state.
The summary of listening reaction is:
First reaction to hearing the Purifi woofers is to be stunned at the quantity, depth, and quality of the bass they reproduce.
Second reaction is to become aware that through the midrange and on up to the hand off to your tweeter transparency, clarity, and dynamic ‘jump’ are by a large margin better than anything I have heard from a 6” – 8” driver. The only other times I have experienced this level of hear into the performance with so many musical details and textures and tones revealed is from 7’ tall line arrays or big horns at the level of Volti Audio.
The following two links are to more detailed listening impressions I posted on diyaudio.com.
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