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Article: PURIFI Audio and the Audiophile Style reader's Q&A with Lars Risbo & Bruno Putzeys

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Thanks a lot!


1. Sonore ultraRendu - Uptone ISO Regen - Calyx Femto - Wyred 4 Sound STP-SE stage 2 - Apollon NC800 SL PRO - Thiel CS3.7
2. JRiver - Burson Conductor V2+ - Audeze LCD-XC - Calyx Femti - Monitor Audio PL100
3. JRiver - SMSL iDEA - 1More Triple Driver IEM

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"The overwhelming majority [of audiophiles] have very little knowledge, if any, about the most basic principles and operating characteristics of audio equipment. They often base their purchasing decisions on hearsay, and the preaching of media sages. Unfortunately, because of commercial considerations, much information is rooted in increasing revenue, not in assisting the audiophile. It seems as if the only requirements for becoming an "authority" in the world of audio is a keyboard."

-- Bruce Rozenblit of Transcendent Sound

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look to who trained them - he is in the article you? wrote


"The overwhelming majority [of audiophiles] have very little knowledge, if any, about the most basic principles and operating characteristics of audio equipment. They often base their purchasing decisions on hearsay, and the preaching of media sages. Unfortunately, because of commercial considerations, much information is rooted in increasing revenue, not in assisting the audiophile. It seems as if the only requirements for becoming an "authority" in the world of audio is a keyboard."

-- Bruce Rozenblit of Transcendent Sound

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38 minutes ago, The Computer Audiophile said:

You lost me

@The Computer Audiophile

What Ralf11 imho tried to express, Prof Andersen is "The Godfather" of Danish Class D, and the last 2 years he was going strong on GaNFET's in his research.

@Ralf11

Chris edited the 20+ pages, it is less about details picking in this ocean of information.

Best Tom

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A quick peruse says it's all about the feedback - what I'll be curious to see is if that control loop is good enough to handle anything thrown at it - such as a somewhat duff PS, plenty of interference junk floating around, and speakers with crazy electrical characteristics.


Frank

 

http://artofaudioconjuring.blogspot.com/

 

 

Ahhh, Mankind ... Porsche intellect, Trabant emotions ...

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10 hours ago, fas42 said:

A quick peruse says it's all about the feedback - what I'll be curious to see is if that control loop is good enough to handle anything thrown at it - such as a somewhat duff PS, plenty of interference junk floating around, and speakers with crazy electrical characteristics.

 

I guess that is what he stressed on the article, all the different unbehaved test cases he tried, and his team of reliability experts.


1. Sonore ultraRendu - Uptone ISO Regen - Calyx Femto - Wyred 4 Sound STP-SE stage 2 - Apollon NC800 SL PRO - Thiel CS3.7
2. JRiver - Burson Conductor V2+ - Audeze LCD-XC - Calyx Femti - Monitor Audio PL100
3. JRiver - SMSL iDEA - 1More Triple Driver IEM

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https://6moons.com/audioreview_articles/purifi/

6moons got a chance to audition some demo amps. The short version: they said these amps can slug it out with the big boys, and from direct sales vendors like Nord, will probably be extremely good amps for what the audiophile market thinks isn't a lot of money. 
 

NAD is apparently coming out with a 2 channel version, it will be interesting to see how it's priced. They did some very nice NCore based implementations before this, and prices weren't in the stratosphere. 


Main listening (small home office):

Surge protector +_iFi  AC iPurifiers >Isol-8 Mini sub Axis Power Conditioning+Isolation>CAPS IV Pipeline Server + Sonore 12V PS>Kii Control>Audiolense DRC>Kii Three >GIK Room Treatments.
 

Secondary Listening: CAPS Pipeline>IFi iOne DAC>Schiit Freya>Kii Three . Also an SBT and a RB Pi 3B+ running piCorePlayer as an SBT emulator. 

All absolute statements about audio are false :)

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Had a NAD Ncore-based amp prior to getting Kalugas.  The NAD was a very nice amp for the money.  Glad Bruno made the point that class D sounds warm, etc. if the recording is warm.  Very true.  What you don't get is homogenized sound, which can be nice when recordings aren't very good.  That isn't to say the Kalugas, for example, are ruthlessly revealing.  Quite the contrary:  I'm amazed how they sound with internet radio.  But they don't reach the amazing levels they are capable of with such material.  Good old rebook, well recorded, does produce like-live sound and that works for me.  

 

What an amazing group of talented engineers, designers, original thinkers and doers.  Thank you for the article. 


Roon / Mola Mola Tambaqui / Kubala-Sosna XLR / Mola Mola Kaluga / KS biwire / B&W 803 D3

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7 hours ago, PYP said:

Glad Bruno made the point that class D sounds warm, etc. if the recording is warm.  Very true.  What you don't get is homogenized sound, which can be nice when recordings aren't very good

Yep, my NCore based system sounds warm on recordings that are - such as good recordings of acoustic jazz and classical. On other stuff, mostly some modern popular music such as pop-rock-hip-hop - it can sound like too much is on the high end. But that's what's on the recording. 
Fortunately, with modern technology I can use DSP to moderate the high frequency output at the flick of a (remote) switch anytime I want. 


Main listening (small home office):

Surge protector +_iFi  AC iPurifiers >Isol-8 Mini sub Axis Power Conditioning+Isolation>CAPS IV Pipeline Server + Sonore 12V PS>Kii Control>Audiolense DRC>Kii Three >GIK Room Treatments.
 

Secondary Listening: CAPS Pipeline>IFi iOne DAC>Schiit Freya>Kii Three . Also an SBT and a RB Pi 3B+ running piCorePlayer as an SBT emulator. 

All absolute statements about audio are false :)

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I am very happy that Purifi is also considering DIY with their modules. As amp technology is advancing to very small distortion levels it may be more interesting to focus on loudspeaker distortion. Purifi shows a mid woofer and claim it is designed to reduce driver distortion. The surround has an interesting shape: half rolled forward and half back. A rolled forward surround distorts with large movement forward (and rolled back the reverse) so does this shape really remove this distortion?

They also claim low magnetic distortion. Is this an iron less design?

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28 minutes ago, sapporo said:

Was there anything more about the drivers before editing the interview?

No, this is the original response from Les Purifiens.

Not much was questioned regarding woofer&driver in the Q&A-thread, as Bruno noted in one of his answers.

Cheers, Tom

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Yes, I would love to learn more about the drivers. From the initial information they seem to reduce distortion by 20-30 dB which may be much more significant than further amplifier improvements 

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I need to admit, that the impression has arrived with me, that Lars & Bruno's answers were somehow quite exhaustive and do not leave a lot of space  to continue questionings, if you compare for example the response1 and 2 from Bruno over @ ASR , there are now even questions about desert island discs answered, which I personally find quite interesting ... (Bruno does like the The Waterboys, so do I!)
Best, Tom

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