By Jaap Veenstra
News & Press Releases
May 4th, 2021
Review of PURIFI PTT6.5X08-NFA-01A midwoofer
By HiFi Compass
PTT6.5W08-01B is an 8-ohm version, I’m not afraid to say, of the revolutionary PTT6.5W04-01A midwoofer from the Danish company PURIFI. I thoroughly reviewed the 4-Ohm version almost a year and a half ago. Since the 8-Ohm version does not differ significantly from its 4-Ohm sibling, in order not to copy-paste myself, I strongly recommend that those who are not yet familiar with PURIFIand its products, first carefully read my review of PTT6.5W04-01A. You will learn from it about the Purifi team and all the innovative technical solutions and unique characteristics of this speaker. In this review I will try to focus on finding differences between the 8-Ohm and 4-Ohm versions and check if the “yellow jersey” of the tech leader in midwoofers has changed its colour.
Oct 20st, 2020
Visiting Purifi Audio
Electroacoustics, the relationship between electrical signals and sound waves, seems to have a special place in the hearts of Danish scientists and innovators. This love affair has lasted for decades, if not centuries, and has resulted in major contributions in many industries including high fidelity audio reproduction. We are currently visiting Danish audio companies to (un)cover the current state of the Danish HiFi legacy and this time the trip went to Purifi Audio in Roskilde.
Purifi Audio will still be an unknown name to most people. Unlike our previous hosts, System Audio and Audiovector, Purifi is a young company and does not bring any end-user products to market. Instead, they focus on quite fundamental research and development within the areas of loudspeaker drive units and class D amplification modules. Although our offices are only 16km apart we first learned about Purifi Audio a few months ago when NAD announced their new NAD Masters M33 integrated amplifier that incorporates Purifi’s Eigentakt class D modules. The article caught our attention, and we decided to get in touch with Purifi to learn more about their projects and technologies. Already before we managed to arrange a visit NAD broke the news of yet another amplifier with Purifi technology. The NAD C298 Stereo Power Amplifier.
The Purifi headquarters are in Roskilde, only 40 minutes drive from the heart of Copenhagen. An autumn Wednesday morning we were warmly welcomed by Claus Neesgaard, co-owner and Director, and co-founder Lars Risbo. A bit later Carsten Tinggaard, co-owner of Purifi Transducer Technology, joined our pleasant chat.
Oct 1st, 2020
Is This the Best Class-D Amplifier? Purifi Audio’s Eigentakt Amplifier Review (Take 2, Ep:15)
By Jay Lee (aka Soulsik) @ sundstagenetwork
Purifi Audio’s Eigentak stereo amplifier comes in a small, DIY-type case that looks so rudimentary, most people would never guess that it could possibly be a state-of-the-art amplifier design. Inside are two of Purifi’s cutting-edge 1ET400A amplifier modules, each capable of outputting 200W into 8 ohms or 400W into 4 ohms, with lower noise and distortion than almost any amplifier in the world, regardless of price. Supporting the 1ET400As are a Purifi-designed gain board (which also has connectors) and a Hypex power supply.
In this video, Jay Lee describes how he was blown away by the Eigentakt’s combination of power and neutrality, and how it drove all the speaker he used it with perfectly and transparentyly. Jay’s experience mirrors what SoundStage! founder Doug Schneider’s found with the Eigentakt many months before, which he wrote about on SoundStage! Hi-Fi on June 1, 2020 – see the article here:
Shortly afterwards, SoundStage! Hi-Fi had the amplifier measured and Doug wrote about the results in a follow-up article:
The only problem with the Eigentakt stereo amplifier is that it is not for sale – at least not directly. It is an “evaluation” amplifier supplied by Purifi Audio, which is based in Denmark, to showcase their state-of-the-art class-D amplification technology – the 1ET400A module – which was designed by Bruno Putzeys and Lars Risbo, two of the world’s leading minds in hi-fi electronics.
Purifi’s goal is to license their technology to other companies, for implementation in their products (Purifi also makes loudspeaker drivers). The first major Purifi licensee is NAD, for use in their new Masters M33 streaming integrated amplifier, which was first announced in January 2020. Not surprisingly, with the Purifi amplifier technology and a wealth of features, it became a resounding success the moment it hit the market. Based on our experiences, we’re confident you’ll see Purifi’s amplifiers in many more products very soon.
#purifi #eigentakt #audiophile
Sep 4th, 2020
NAD Intros C 298 Power Amplifier With Purifi Eigentakt Amplification
Powerful Two-Channel Model Establishes New Standard For High Performance Audio
PICKERING, ONTARIO, CANADA SEPTEMBER 9, 2020 – NAD Electronics, a leading manufacturer of premium home audio and video products, announced another high- performance amplifier that uses Purifi Eigentakt™ amplification technology. The C 298 is a two-channel powerhouse that is a perfect partner to high quality preamplifiers or in any application where additional channels of audiophile amplification are desired. This new NAD classic amp boasts 185 Watts per channel into 8 Ohms and can be bridged to 620W X 1 into 8 Ohms to create a huge Monoblock. The C 298 ($1,999 U.S. MSRP) will be shipping in October 2020.
Sep 1st, 2020
The Purifi Puzzle, Part One: The Measured Performance of the Eigentakt Amplifier
By Douglas Schneider
On June 1, in “Purifi Audio’s Pint-Sized Powerhouses,” I described a bit of the history and technology behind Purifi Audio’s class-D 1ET400A amplifier module and PTT6.5W04 midrange-woofer, which Purifi sells as OEM parts to other manufacturers. I also gave my impressions of the sounds of the speaker and amplifier evaluation kits Purifi sent me, as listened to in a typical two-channel setup. One kit was the Eigentakt stereo amplifier, a small, DIY-type case housing two 1ET400a modules, a Purifi-designed gain board, and a Hypex power supply. The other was the SPK5 loudspeaker, which marries the PTT6.5W04 midrange-woofer to a Mundorf air-motion transformer (AMT) tweeter in a basic enclosure mostly made of plywood. At the end of that article, I wrote that I hoped to have both products measured, and the results posted online, by “July 1 or, at the latest, August 1.” …
Aug 18th, 2020
LKV Veros PWR+ power amplifier
By Herb Reichert …
I went to the LKV Research website and clicked Products, then “Veros PWR+ Power Amplifier.” The first words I read were: “The Most Musically Accurate Power Amplifier Output Stage Available.” I stopped, read it again, then smirked at the expression “musically accurate.” I am pretty sure the author is trying to celebrate the fact that LKV Research founder Bill Hutchins uses Purifi Audio’s 1ET400A class-D power amplifier modules, designed by Bruno Putzeys. …
Aug 16th, 2020
Purifi Audio PTT6.5W04-01A 6.5 Inch Woofer Review
Bottom Line This is the best speaker I have tested (I don’t have the same distortion data for the Scan 18wu I mentioned above). An incredibly low 2% THD at 80Hz with 12vRMS (making for about 101dB @ 1 meter) and well below 1% THD above 100Hz.
Aug 14th, 2020
Jones-Scanlon Baby Reds
By Phil Ward, Speaker-building is an established art, but occasionally it can still yield surprises — such as the strange and wonderful Baby Reds.
Monitors often tend somewhat towards the formulaic, but occasionally I get to play with something that’s a little off-piste. My SOS colleague Bob Thomas reviewed the larger Jones-Scanlon monitors back in the SOS August 2019 issue and was somewhat blown away by them, so I was fascinated to spend some time with the smaller and significantly less expensive model. I should add that, though cheaper than their previous model, the Baby Red is still priced some distance from the entry-level bracket…
Jul 20th, 2020
NAD NOW SHIPPING MASTERS M33 BluOS STREAMING DAC AMPLIFIER
Flagship Model Builds On Brand’s Remarkable Success with Advanced Features, Cutting-Edge Technology and High Power
PICKERING, ONTARIO, CANADA JULY 20, 2020 — NAD Electronics, the highly regarded manufacturer of high-performance audio/video components, announced it is now shipping the M33, a BluOS™ enabled DAC/amplifier that can serve as the heart of a reference whole-home system. In its simplest form, the M33 ($4999 U.S. MSRP) is an ultra-high-performance streaming amplifier with superb audiophile sound. Or it can be combined with other players in a BluOS ecosystem of wirelessly networked music players throughout the home for an outstanding whole-home audio system.
With the employment of the new Purifi Eigentakt™ (self-clocking) Hybrid Digital amplifier technology, the M33 follows NAD’s long-standing tradition in identifying and developing cutting-edge amplification technology. With a minimum of 200W per channel on tap, the result is lifelike performance, exemplified by ultra-low distortion and noise. The measured performance is remarkable in that it exceeds the capability of even the most sensitive and sophisticated test equipment available.
Jul 10th, 2020
Audiophile Myths About Amplifier Negative Feedback Debunked
By Bruno Putzeys, audioholics.com
Feedback is an ubiquitous and unavoidable basic technique that keeps the world running. It is only controversial in audio, and then only specifically in power amplifiers. As more respected manufacturers are coming out of the closet concerning their heavy and happy use of feedback, the myth is increasingly on the back foot. Here we present a pseudo-interview to help answer questions about feedback which is a fascinating and complex topic that lies at the core of successful design.
Q: What is Negative Feedback and what is it good for?
A: When you stand up without falling over, that’s feedback. Your inner ear has a kind of gyroscope that tells you where down is, and instructs your feet to move your center of gravity when it looks like the direction of down is changing. That’s combined with visual input from your eyes, so people whose inner ear balance doesn’t work can still stand up straight. That is, until they close their eyes and their feedback turns off. Then they keel over.
People use feedback constantly when they drive. You stay in your lane by looking at the lines and steering the car to stay between them. No sane person would suggest that driving with your eyes closed makes you a better driver.
Feedback is part of the physics of life. Paper planes only fly true because the slightest turn gets rewarded by an opposite push from the flowing air. Feedback just means that what is going to happen next is in some way influenced by what’s happened before.
Feedback is everywhere. All we do as engineers is use that perfectly natural phenomenon to help us get difficult stuff done. ….
Jun 29th, 2020
Is this the best Class-D amp ever made?
By Jez Ford, Sound+Image Magazine
There’s a new amplification technology in town, which purports to take Class D concepts to a new level, with negligible distortion, extraordinarily low noise, load-invariant response, exceptionally clean clipping, low losses and high efficiency, while delivering 400W of power without even getting hot. It comes from Purifi, in Denmark, which has named the technology ‘Eigentakt’, which is German for ‘self-clocking’. We’d exercise our usual caution with such remarkable claims, but what makes us more inclined towards credence in this case is NAD’s rush to adopt it, and also the team that’s behind it. The three listed co-founders of Purifi Audio are Bruno Putzeys, Lars Risbo and Peter Lyngdorf — a pretty illustrious trio.
Meet the team …
Jun 1st, 2020
Purifi Audio’s Pint-Sized Powerhouses
After assembling in my listening room the best-sounding stereo system I’d heard anywhere, and writing about it in April, I did something to that extraordinary setup that most audiophiles might find unthinkable: I disassembled it. I needed the room to explore some cutting-edge products with features and technologies that might get me close to the sound quality of that ca.-$150,000 system (all prices USD) for a lot less money. The first of those products was Anthem’s STR preamplifier ($3999), whose extensive features I still haven’t fully explored.
This month, however, I don’t write about products consumers would be likely to buy. Instead, the focus is on Purifi Audio, a Danish concern that supplies components for other audio companies’ consumer products. These include the 1ET400A amplifier module, the PTT6.5W04 6.5” midrange-woofer, and the evaluation kits provided for them. The amp and driver are available to DIYers: at Purifi’s online shop, the 1ET400A sells for 2018 Danish kroner (currently about $300; all prices exclusive of VAT), the PTT6.5W04 for 2329 DKK (about $345). So far, the most prominent company to use a Purifi part is NAD — the 1ET400A forms the amplification heart of NAD’s new Masters Series M33 integrated amplifier-DAC, which should make it to store shelves this month for $4999.
Jan 6th, 2020
NAD Masters M33 BluOS Streaming DAC Amplifier Becomes First Integrated Component to Feature Purifi’s Ultra-Quiet Amplification Technology
Flagship Model is feature-packed, including BluOS multiroom streaming, Gorilla Glass touchscreen controls, 32-bit DAC, full MQA decoding, and Dirac Room Correction.
CES 2020, Las Vegas, NV January 6, 2020 — NAD Electronics, the highly regarded manufacturer of high-performance audio/video components, unveils another new and unique Masters Series product here. The M33, a BluOS™ enabled DAC/amplifier that can serve as the heart of a reference whole-home system. In its simplest form, the M33 (US$4999/€4999/£3999 MSRP) is an ultra-high-performance streaming amplifier with superb audiophile sound. Or it can be combined with other players in a BluOS ecosystem of wirelessly networked music players throughout the home for an outstanding whole-home audio system. The M33 will be available in March 2020.
Dec 23th, 2019
Purifi PTT6.5 Woofer and 1ET400A Amplifier Technology Review
I enjoy reviewing innovative loudspeakers like the Dutch and Dutch 8c and the Kii THREE. I also spend time on diyAudio’s loudspeaker forums looking at what to build next or modify what I have, essentially looking for the “next big thing.” I noticed Purifi’s woofer getting good reviews on diyAudio and ASR. On Audiophile Style, @DuckToller wrote an article on meeting the folks from Purifi in Munich with @The Computer Audiophile. Reading those really peaked my interest.
HiFiCompass’ review of the PTT6.5 shows the woofer measuring considerably better than its competitors, especially in reduced distortion, both THD and IMD. This puts Purifi’s PTT6.5 woofer into a class on to itself. Now I really wanted to hear this woofer! Before I could track down a pair, I received a note from DuckToller asking if I would be interested in evaluating the woofers in kit form. A short while later I received a demo kit and a stereo IET400A amplifier.
I must say upfront that this technology represents a major audible improvement in mid/bass clarity and low frequency extension. Meaning, I have not heard a 6.5” woofer go this low or sound this clean, at concert level volumes. To my ears, the Purifi PTT6.5 woofer is the “next big thing” in transducer technology. 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.
Nov 14th, 2019
HiFiCompass review of PTT6.5W04
The famous expression “All roads lead to Rome” in the context of today should read “All roads lead to Denmark”. I will not be mistaken if I say that most home speakers up to the very top class are currently being assembled using speaker drivers with Danish roots. Judge for yourself:
Oct 23th, 2019
Purifi Audio – A Straight Wire to the Soul of Music
As audioXpress previously reported, Purifi Audio is a new venture involving several audio industry veterans. The Netherlands Audio Engineering Society (AES) section invited two of the company’s founders, Bruno Putzeys and Lars Risbo, for a technical update on their plans, and they graciously agreed to a presentation on June 13 at the Royal Conservatory of Music in The Hague. Our Technical Editor Jan Didden attended and reports.
Jul 19th, 2019
6moons.com: Eigentakt Demonstrator Amplifier
Actually, that’s not what the emailer said. Instead, “you might have picked up some noises about me taking part in a new Danish project called Purifi. We combine work on class D amplifiers and speaker drive units specifically to reduce distortion in both. My partner Lars Risbo and I have achieved a roughly 20dB improvement over current designs in both cases. Sonically the impact is quite startling. We are gearing up to become an OEM supplier of
drive units and amplifiers. A few key customers have already gotten samples to play with. So we decided it’s time to go a bit more public.” That was Bruno Putzeys, inventor of class D uCD/Ncore, collaborator in Grimm Audio, engineer with Kii Audio.
Behind Purifi, there’s the already mentioned Lars Risbo who founded Toccata Technology which was later acquired by Texas Instuments for its PCM-PWM direct-digital technology. Lars holds more than 30 US patent families. There’s Carsten Tinggaard, founder/owner of PointSource Acoustics, previous product manager at Danish Sound Technology and CTO of Tymphany where he was in charge of establishing the Danish R&D facility which worked on Peerless, Vifa and ScanSpeak drivers. There’s Peter Lyngdorf of Hi Fi Klubben, Dali and Steinway Lyngdorf, a group with 1000+ employees and multiple factories in Denmark and China. Peter’s background includes stints at NAD, Snell and TacT Audio. There’s Claus Neesgaard who worked for Texas Instruments, Kim Madsen who also came from there plus developed military power modules for Alcatel’s Ariane 5 Rocket and several Dynatech fighter jets. Finally there’s Søren Poulsen again from TI where he owns definition and architecture development of the world’s highest-power top-performing IC amplifier with 5 US patents. That’s an amazing dream team with fantastic resources….
Jul 3rd, 2019
Review and Measurements of Purifi 1ET400A Amplifier
This is a review and detailed measurements of the Purifi 1ET400A Class-D amplifier module. Company was kind enough to send me a complete, assembled kit consisting of two modules, power supply and case, ready to go. They have not disclosed the cost of the unit. Modules will be available to DIY channel in Q4 of 2019.
Jun 28th, 2019
PURIFI Audio and the Audiophile Style reader’s Q&A with Lars Risbo & Bruno Putzeys
Audiophile Style has already introduced to you PURIFI Audio in a quick manner last month, when we reported from a sneak listening on their prototype Class D amplifier board and the newly developed long-hub transducer in Munich.
Two of the principal owners of the Danish High End upstart, Lars Risbo and Bruno Putzeys from Belgium, then have agreed to the idea of an Q&A with you, our readers, in respect to all the questions that come along with new products and advancements in Class D amplification and transducer technology. You have left us with a bunch of great & challenging questions, however, Bruno and Lars have delivered answers with grace, passion and fire.
Jun 6th, 2019
Purifi Audio: A Conversation About Amplifiers and Speakers
As audioXpress revealed a few weeks ago, a new Danish audio company, founded by Bruno Putzeys, Lars Risbo, and Peter Lyngdorf was recently announced. The name is Purifi Audio, and as you can guess from the founders involved, the venture promises Class D amplifiers with record-breaking performance “unmatched by amplifiers of any operating class.” But the new company will be doing more than amplifiers, since it also revealed a new 6.5″ woofer with “magnitudes lower intermodulation distortion across frequency and SPL.”
May 8th, 2019
NAD Electronics and PURIFI Announce Cooperation Agreement
NAD will license PURIFI’s patent-pending amplification technology to create next generation amplifier platform
Munich High End 2019, Munich, Germany, 8 May, 2019 – NAD Electronics, the acclaimed high fidelity audio brand with more than 45 years of leadership in performance amplifier innovation, announced that it will be the first international brand to incorporate and launch PURIFI’s new patent-pending class-D technology into its product family. The amplifier circuit, known as Eigentakt (meaning “self-clocking”), is the result of years of research by PURIFI into the self-oscillation behaviours in class-D amplifiers with algorithms that, when applied in control loops, improve existing designs by an order of magnitude or more. The agreement will see the two companies cooperate to adapt the Eigentakt circuit to NAD’s signature design requirements, with the intent to create a new amplifier platform for future, yet-to-be-announced products from NAD.
“The Eigentakt technology is unique,” explains Bruno Putzeys, Co-Founder at PURIFI Audio. “Amplifiers carrying the technology will be exceedingly indifferent to speaker load, volume level, and signal content, resulting in negligible THD and IMD levels, and will feature exceptionally clean clipping.”
According to measurements by PURIFI, the Eigentakt circuit is expected to outperform any audio amplifier known, regardless of echnology or class, with THD and IMD quoted as below 0.00017% at all frequencies and power levels, and the requency response in the audio band remains within +/- 0.01 dB under all load conditions. In addition to its status as a groundbreaking technology, it also represents one of the first products to be commercialized by PURIFI, which was founded in 2014 by industry veterans and renowned audio experts Putzeys, Lars Risbo, and Peter Lyngdorf.
“Our NAD design team, led by Greg Stidsen, Taresh Vadgama and including the late Bjorn Erik Edvardsen, have maintained a close working relationship with Bruno, Lars, and Peter over the years. Clearly we all share the same commitment to audio excellence so NAD is pleased and proud to be at the forefront of adopting PURIFI’s class-leading technology,” said
Gordon Simmonds, CEO of the Canada-based Lenbrook Group, owners of NAD Electronics as well as other high-fidelity audio brands, Bluesound wireless multi-room and PSB Speakers. “Our teams are already fully engaged in the process of developing a next generation amplifier
platform that will feature this circuitry, keeping NAD and our other brands at the forefront of audio technology as it begins to weave into our product roadmap.”
“I have personally been involved with NAD Electronics and have known the Lenbrook team for 40 years,” said Lyngdorf, Co-Founder and Chairman of PURIFI. “NAD is the perfect collaboration partner for this new technology and we look forward to their implementation, as we are sure it will propel the industry’s expectations for high-fidelity amplifiers.”
About PURIFI Audio
Based in Roskilde, Denmark, PURIFI was founded in 2014 by industry veterans Bruno Putzeys, Lars Risbo and Peter Lyngdorf, out of a shared conviction that truly significant improvements in musical experience can only be had by addressing technical fundamentals in electromagnetics, mechanics, and acoustics. With a focus on developing and verifying accurate mathematical models to solve problems in analogue and digital sound reproduction, PURIFI aims to remove all technical limitations in the enjoyment of reproduced music. Their first contribution is a new Class-D amplifier circuit called Eigentakt.
For more information visit www.purifi-audio.com
About NAD Electronics
Founded in 1972 and now sold in over 80 countries, NAD Electronics is renowned for its award-winning line of high-quality components for audio, home theatre and custom installation applications. Since the beginning, NAD’s commitment to four core values – innovation, simplicity, performance, and value – have earned it a cult-like following that catapulted it to becoming a household name amongst audiophiles and music lovers alike. To this day, the brand continues to design and manufacture some of the most acclaimed and affordable hi-fi components that include modern features and technologies meant to appeal to a new generation of audiophiles.
For more information visit www.nadelectronics.com
About Lenbrook International
Lenbrook International, a subsidiary of the Lenbrook Group of Companies, is the owner and manufacturer of award-winning brands for home audio and residential install applications. Its full suite of products from NAD Electronics, PSB Speakers, and Bluesound wireless multi-room players, are distributed in over 80 countries, while its BluOS hi-resistributed audio platform continues to be adopted by some of the world’s leading premium audio brands.
For more information visit www.lenbrook.com
Director, PURIFI ApS
North America Media Relations, NAD Electronics
UK Media Relations, NAD Electronics
May 1st, 2019
Danes to PURIFI Amplifiers And Speakers
PURIFI, a startup from Denmark, is launching a freshly designed line of loudspeaker drivers and new power amplifier modules at the same time. The first amplifier product is a 400W class D module that uses PURIFI’s Eigentakt control scheme, which delivers a stated THD and IMD below -115dB (0.00017%) at all levels and frequencies. Its negligible output impedance insures that the +/-0.01dB frequency response is guaranteed for all loudspeaker loads. The first loudspeaker product is a 6.5” driver with a +/-10mm linear stroke whose IMD is said to be around 20dB lower than that of comparably specified drivers.
For a new company to attack two such disparate lines of work becomes a bit less unusual when one considers the names behind the venture: Peter Lyngdorf, Bruno Putzeys and Lars Risbo. All three have a proven track record in both amplifiers and loudspeakers.
The three started PURIFI because of a shared conviction that real improvements in musical experience can only be had by addressing the technical fundamentals. “The high end audio industry has historically had trouble coming to grips with basics like distortion, tacitly deciding to ignore the problem instead,” notes Putzeys. “It’s not just electronics,” adds Risbo, “loudspeaker units have some clearly identifiable distortion mechanisms that just sit there waiting to be solved”. Backed by Peter Lyngdorf, the pair have thrown themselves onto a project to take on distortion in amplifiers and loudspeakers alike.
In both cases their approach is highly systematic and mathematical. The philosophy is that while simulations are useful virtual prototyping tools, they do not provide any deeper insight than trying things out in the lab. By contrast, mathematical descriptions of the problem often end up spelling out the solution.
PURIFI’s amplifier modules are industrialized by the team previously responsible for rolling out Texas Instruments’ high power class D amplifier chip range. For the drivers the company has joined forces with Carsten Tinggaard (PointSource Acoustics and formerly Peerless) who for the past two decades has been behind some of the most recognizable drive units in the industry.
To coincide with the High End show in Munich (8-12 May), the company is organizing a demo targeted at high end electronics and loudspeaker manufacturers who are interested in incorporating one of the new technologies.
For inquiries contact PURIFI’s MD, Claus Neesgaard (email@example.com). For further technical information and a background on the whole team, please check www.purifi-audio.com
Apr 18th, 2019
Purifi Audio Promises to Reduce Distortion in Speakers and Amplifiers
A new Danish company, founded by Bruno Putzeys, Lars Risbo, and Peter Lyngdorf will be making its first public presentation to the industry in Munich 9-12 May, concurrently with High End 2019. The name is Purifi Audio, and as you can guess from the founders involved, the venture promises Class D amplifiers with record-breaking performance “unmatched by amplifiers of any operating class.” But the new company will be doing more than amplifiers, since it will also reveal a new 6.5″ woofer with “magnitudes lower intermodulation distortion across frequency and SPL.”
Some of our readers who follow the audio industry closely might have already picked up the rumors about the new Danish project – until now in stealth-mode – which combines work on Class-D amplifiers and loudspeaker drive units specifically intending to reduce distortion in both. Purifi Audio was born out of the research work of Class-D pioneers Bruno Putzeys (of Philips, Hypex and Kii Audio fame) and Lars Risbo (Toccata Technology and Texas Instruments), according to which, the new “Eigentakt” self-clocking amplifier technology achieves a roughly 20dB improvement over previous generations.