Purifi spk4 The port clearly shows problems. But they can build a midrange high frequency coax (300Hz to 20kHz) with a fitting coax waveguide. 48”W x 1. Beveled edges was a last resort solution against diffraction. Jan 21, 2024 · I believe Purifi is an OEM supplier, which means that they will supply the technology for someone to make and sell the product under their own brand Feb 25, 2020 · So let’s verify this claim by first looking at the step response of the uncorrected Purifi SPK4: So the spike (doublet) at time 0ms on the horizontal scale is the AMT tweeter and the negative going portion is perfectly blended into the start of Purifi’s PTT6. The external passive crossover is pretty big. Draki Active Member. Jun 29, 2023 · Done! A two-way passive speaker with flat deep bass response and a wide, controlled dispersion up to 20Khz. Coupled with Purifi’s 1ET400A amplifier, this is the lowest distortion sound I have heard from any amp/speaker combo of this size in my listening room. The key feature of high excursion with low distortion of the Purifi woofer isn't beneficial for such a coax due to the modulation with higher excursion. com for more details. Same chart, but limited to 200-20kHz . Apparently no one has yet found the right mix of tweeter, enclosure, and crossover to maximize the potential of this extremely expensive and excelllent midwoofer. Dec 23, 2019 · To my ears, the Purifi PTT6. More details about the Purifi SPK16 reference design. Several designers have also remarked a PR (ideally dual PRs) is almost mandatory for the Purifi, but imagine trying to sell a driver that needs dual PRs to reach it's potential to manufacturers. 23”D. Another DIY effort made with the Purifi 4" Midwoofer. I appreciate what you are saying but the end result is what counts. Apr 2, 2020 · 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. So, Purifi guys…send a pair over please. 5W04-01A 6. Do you have the SPK6 &7 too. Check out purifi-audio. 10 2020-01-31 Jantzen part numbers added for cross over components SPO Jul 3, 2020 · A Purifi coax would be really great. The original sample had some enclosure leakage issues which have been resolved in this unit due to collaboration between our DIY expert, @Rick Sykora, and builder Jan 26, 2019 · This is just a proof-of-concept design that shows the Purifi as part of a functioning loudspeaker for manufactures to evaluate. 5RQ Balanced Power - Tascam CD200 - Oppo 93 - Auvio HD Radio Tuner- MiniDSP OpenDRC-DI DSP, 2x4HD - AcourateDRC - UMIK-1 - ECM8000 - REW - Behringer DEQ2496 - Behringer UMC202HD and Focusrite 4Pre USB - Benchmark DAC2 HGC - Krell KCT pre and FPB 350mcx monoblocks - Sennheiser HD650 - MartinLogan reQuest 15" x 48" electrostatic hybrid with 12" sealed woofer 180Hz cross Mar 14, 2020 · The Purifi designed bookshelf speakers with AMT driver has been auditioned by many people, all positive and some glowing, with none of the issues you claim as evidence of poor design. Imho, it could be likely that Peter Lyngdorf could integrate this speaker design into one of his business interests. Nov 23, 2020 · Scaling done to same limits as in Purifi App Note. But this "prototype" is a nice example of how much work goes into well-designed loudspeakers in terms of chassis selection, cabinet design, chassis placement on the baffle, crossover tuning, Oct 23, 2018 · Purifi seem to be demoing it in a small (sealed?) encosure paired with a Mundorf AMT (as seen in this article): EDIT: The box is ported, and there's a description of it here: SPK4 (simpel demo enclosure) EDIT2: And here's a review of the SPK4. 00 2019-12-19 Document replaces SPK4 – App Note KNM 1. Apr 27, 2023 · We might be getting a bit ahead of ourselves here, but if purifi were to make a co-ax I think they may need to use a non-ribbed surround on the diaphragm for, well, maintaining a smooth profile for the waveguide, and that could have some less-than-optimal performance implications on the mid driver, so there'll definitely be more challenges Jul 6, 2021 · They (the peole working in/for Purifi) are specialists in what they do and motivated to thrive for excellence in their own domains. Aug 3, 2018 · As a prototype for the 4'' Purifi woofer the combination with the AMT would probably have been a bit better (in the horizontal directivity). 5 woofer. Very nice sounding, and gets round all that port/ PR nonsense as the 12NTLW3500 picks up on the mid bass and thunders it out with effortless clarity. 30”H x 3. Technology Discussion Jun 1, 2020 · Purifi’s 1ET400A is a class-D amplifier module on a single circuit board measuring only 2. Unfortunately like the last one reviewed by ASR, this one also measures as deficient in the bass. It would be wrong to expect Purifi acting like MoFi's Andrew Jones or Wharfedale's Peter Comeau. Here is a look at the new front baffle. Here are some REW measurements at 30cm in my room with no gating and REW's default 500ms window: That's 1/24 octave smoothing. com PURIFI Information Jul 2020 2 2 Crossover tuning The SPK5 Crossover kit is designed to provide a 2 nd order acoustic low pass function for the woofer and 2 nd order acoustic high pass function for the tweeter to provide well behaved transition from one driver to the other in the crossover region, both on- and off-axis. Feb 23, 2023 · For instance, attached is the maximum SPL of purifi driver (1m 2pi). I don't understand why they went this route. However the design of the SPK is just nothing spectecular and noth worth the purifi name IMO. im tempted to go for Neumann kh120 actives with kh750 sub, so although the response is flat, lot more distortion in the amps than the purifi Amps. It is thicker than the original by half an inch and used the extra thickness to bevel it to fit. (see attached press release for more info) Mar 14, 2020 · I reviewed the Purifi SPK4 Fantastic! The external passive crossover is pretty big. . The tweeter performs poorly as well. Also I have total 2 nos Dayton Audio - DS215-PR - 8" Designer Series Passive Radiator can I use the SPK8 box with 1 PR per box regards anand sales@purifi-audio. Joined Jan 22, 2020 Messages 119 Likes 158 Location . Purifi SPK4 Loudspeaker Demo Kit and 1ET400A stereo amplifier (top view). That and I haven't done any AMT builds so it seemed like a good place to start. Mitch Barnett auditioned the SPK4 which has been further refined in the SPK5 design. It’s monaural -- you need two for stereo -- and pretty powerful, with a claimed output of up to 425W into 4 ohms, with not more than 1% total harmonic distortion (THD). Feb 27, 2020 · @mitchco reviewed the SPK4 and was duly impressed by its performance incl bass. Jul 3, 2020 · Purifi will be a the Munich High End show (Hall 1, A8 - Munich, May 18-21, 2023) and they have an open show room at Saturday afternoon in a more privative environment. Add baffle step compensation and it's even less, but add potential room gain and it's more (these two parameters are installation effect so in order to max comparison I believe the graph made by Lars Risbo is the good way). Not sure what XO components are intended to be used for SPK5, but there is no way this crossover can fit into the SPK4 cab. sales@purifi-audio. 5 woofer is the “next big thing” in transducer technology. Classic or “textbook” passive crossover design. Feb 13, 2016 · This is a second review and detailed measurements of Purifi woofer reference design implementation by Celuaris called SPK5. May 24, 2024 · PURIFI Transducer Technology ApS, Lars Risbo SPK16 Reference Design SPK16 is a passive 2 way speaker system with a 6. yet. a-gainer said: add: the "lack of heft", missing "impact" in the bass actually may be the consequence of less distortion. Jun 19, 2020 · Purifi PDF application notes for SPK4/SPK5 prototypes list PTT6. 5X-NAA alu cone woofer assisted by two passive radiators on the sides of the box combined with a prototype of the coming PTT 33mm long stroke dome tweeter. SPK16 is a passive 2 way speaker system with a 6. Jun 19, 2020 · The Purifi and the ribbon seem to work seamlessly together especially through the vocal range. 5 Inch Woofer. Feb 13, 2016 · This is a review of the Purifi SPK5 reference speaker design for their PTT6. Such a product might sell very well. It was built and sent to me by the company, Celuaris Jan 14, 2020 · The SPK4 used a straight vent and my modeling suggested this was fine. Should note that the shallowest response (gold) roughly corresponds to the Purifi SPK5 and the next shallowest is the SPK4. Apr 2, 2020 · Hi Kim how come you have the Purifi 4: SPK8 when its not on the site. Jan 14, 2020 · This is 4pi space response so am showing the impact of an example baffle step effect as it plays a part in picking the tuning and crossover design to flatten. Where did Purifi go wrong with the updated/improved SPK5 version? Where did Purifi go wrong with the updated/improved SPK5 version? Jan 14, 2020 · Slightly off topic, but what would be recommended speaker pairing with the purifi amps. Thanks to our breakthroughs in nonlinear control theory and advanced mathematical modeling, we have developed a new patented amplifier topology that is numerically optimized for the best possible tradeoff between headroom and error correction. 5W04 is usecase. Well, we can’t do any computer simulated listening. It's a fantastic midwoofer (use it myself). Visit the Purifi website. 5khz crossover. com PURIFI Information December 2019 6 Figure 6 Impedance, no port damping 5 Revision History Rev Date Description ID 1. Dec 1, 2018 · System: Equitech 1. 5X-NAA alu cone woofer assisted by two passive radiators on the sides of the box combined with a prototype of the coming PTT 33mm long stroke dome twee May 25, 2020 · Different from the Purifi SPK4 Demo Kit I reviewed a while back. pzntupvqfiumvzgvvlncfttdkfluacgccfeddgvafwpgwmyaq