![]() That and using the manufacturer’s data sheet IEC power handling = 350 watts I readily admit states system redlined case. If one wants to use the Linear Xmax does one enter in the PTT6.5W case as 10 mm or the plus and minus unsigned sum of 20mm? For the graph above the Unibox Xmax peak is set at 14.5mm and PTT6.5PR Xmax peak is set at 15mm. One aspect of using UniBox I have always found a little fuzzy is the driver parameters have the entry for Xmax listed as “Xmax peak”. The PTT6.5W04-01A data sheet lists Linear Xmax +-10mm and Mechanical Xmax +-14.5mm, the passive radiators are listed as having Mechanical Xmax +-15mm. Your graph has 10Hz at the origin, so you are hitting ~93dB 30Hz (not 98dB as claimed).” Isn't the woofer xmax 10mm? (ok you can usually add 15% "safe" overexcursion if you want). ![]() The following two links are to more detailed listening impressions I posted on .ĭave Bullet commented and asked: “ Your unibox model seems wrong to me as well as interpretation. 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. 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. That may take a while given how much I am enjoying listening to these in their present state.įirst reaction to hearing the Purifi woofers is to be stunned at the quantity, depth, and quality of the bass they reproduce. The stain + single coat of poly finish will be eventually be upgraded to veneer and high gloss epoxy. ![]() For these prototypes the finishing was shortcut by the arrival of the drivers from Denmark. 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.Īnd the as-built. 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 front and side views showing a dome tweeter reveal this box’s origins from my NT10 design shown at Lone Star Audio Fest in 20. 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. Here is the Fi16v1 bass alignment simulation from UniBox. The PTT6.5W04 seen test fitting Steve’s CNC programming skills is there for a SMJ Audio project I await with anticipation. The 3D render is Steve’s he created using my 2D drawings to verify we were on the same proverbial page. Steve Manning to the rescue, just look at the fantastic Birch ply baffles with threaded inserts he created off my drawings. 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. ![]() DSP in JRiver music player software was used to correct the 8.5 dB difference in sensitivity between woofer and tweeter.įirst off a recommendation for and thanks to SMJ Audio without whose help I would be staring at the Purifi drivers in their cardboard boxes rather than enjoying listening to them. It is repurposed from my NT10 design as a stand in while drivers are measured and Fi16 crossovers (both passive and active) are designed. Crossover is external and should not even be considered a preliminary design. 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. This blog post is a good introduction to the technology that led me to pursue Purifi’s drivers: Starting this thread for discussions and reports on systems using Purifi Audio’s ( ) groundbreaking loudspeaker drivers.
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