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    1. Mivera Audio Forum
    2. The Puremusic family
    3. Testing the new Purifi 1ET400A amplifier modules
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    Mike
    May 13

    Testing the new Purifi 1ET400A amplifier modules

    658 comments

    Edited: May 17

    Hey guys, we have some Purifi 1ET400A SOTA amp modules coming soon. They are the latest and greatest tech from the mind of Bruno Putzeys:

     

    https://www.purifi-audio.com/eigentakt/

     

    Follow this thread to see what I think compared to our Icepower Iceedge based amp prototypes for the Puremusic.

     

    These are 2 of the very best measuring amplifiers in existence of any class. Both will be powered from the same supplies. So it will be an apples to apples comparison.

    5
    mfbolek2112
    Loyal Supporter
    May 14

    I will definitely follow this one. Bruno has been busy recently... with the Kii speakers and this. Interesting that P Lygndorf is part of the founding team. I think you should bypass your full range speaker and go to an active drivers and pair with your DAC technology.

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    Mike
    May 14  ·  Edited: May 14

    My full range speaker will be fully active. When you only need 1 channel per driver you can make an active pair of speakers with the 2 channels from the Puremusic Jr. However I'm thinking I might reserve the 2 way models to be fully active with my Puremusic's. I really don't want to go back to passive crossovers.

    1
    Mike
    May 17  ·  Edited: May 17

    Should have my Purifi 1ET400A evaluation kit in under 2 weeks. It comes with a basic input buffer board, and 2 modules. I'm going to source the supply elsewhere. Basically the quality of the input buffer is going to determine how this unit sounds. Just like with the Hypex NC-500/1200. Unlike the Icepower 1200AS, you need an input buffer with these modules. The input impedance is only 4.4K, and it only has 12.8db of gain. But I have loads of experience in this department. I built 9 generations of input buffers for the NC-500. Gen 2 is used by Nord, Apollon, and several others. By the time I made it to gen 9, the gen 2 buffer that so many love sounded broken in comparison.

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    Mike
    May 17

    New writeup on Purifi:

     

    https://audiophilestyle.com/ca/bits-and-bytes/meeting-the-experts-of%C2%A0purifi-in-munich-r801/

     

    I really wanted to go to Munich for this event, but bad timing. Too busy with the Puremusic Jr, moving etc.

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    Mike
    May 17

    I only sold 1 product with my 9th gen NC-500 input buffer. The lucky owner is @Audiogeek. The Purepower integrated. It had 4 channels of preamp using 8 fully balanced Slagleformer autoformers! 4 went to the internal amps, and the other 4 to the pre-outs. to fade the volume from the pre-outs to the internal amps, you press the side buttons on the remote. Right display internal amps, left pre-outs. It was made for an active setup. You had the option of an active or passive buffer on the NC-500's enabled by rear push button.

     

     

     

     

     

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    Audiogeek
    Loyal Supporter
    May 17

    I have 2 purepowers with the 1200as. The 9th gen nc500 betters them in every way except absolute grunt. If the purifi amp is another step up it would be amazing. The puremusic monoblocs should be exceptional.

    1
    Mike
    May 17

    The Puremusic Monoblock's will be the 10th gen. With digital inputs so no DAC is required.

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    Mike
    May 19

    I’m also contemplating building a stereo unit like the Puremusic Jr with these amps, as an intermediate product between the Puremusic Jr, and Puremusic monoblock‘s.

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    Mike
    May 23  ·  Edited: May 23

    With the Purifi EVM buffer board there's the ability to add additional regulation as well as bypass the onboard input buffer. So I'll be able to test out with my opamp-less Purebuffer from the Puremusic Jr, along with my Purereg regulators. I suppose my Purebuffer is my 10th generation buffer. The Purifibuffer will be the 11th gen.

     

     

     

    1
    Mike
    May 23  ·  Edited: May 23

    I announced this in my Puremusic Jr listening impressions thread. So I suppose mention it here as well.

     

    I'm planning a new addition to the line up in-between the Puremusic Jr, and Puremusic monoblock's. It will just be called the Puremusic. They will use the Purifi 1ET400A modules, with 11th generation Mivera Audio input buffers using technology taken from the PMJ Purebuffer design. But far more advanced as they need to have more gain, and many power supply elements built onto the board. Far far better than my 2nd gen buffers used by Nord, Apollon, and several others in their Hypex Ncore NC-500 amps.

    Also it will have a higher end DAC section than the PMJ, that I'm confident will be superior to even what the discontinued Purestream MK2 would have been. It will use iOS device based battery powered wireless streamer input the same as the PMJ. Target price is $2999, but not written in stone yet.

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    Mike
    May 23  ·  Edited: May 23

    People may be wondering where's the discrete class A opamps? Well I've found a better way to do things that opamps of any type, discrete or IC can't touch when it comes to sound quality. The best opamp is no opamp! This is a huge reason the Puremusic Jr sounds so good for a measly $1099. Just wait until I supercharge this implementation with the Purifibuffers! :)

    4
    MFJG
    Loyal Supporter
    May 23

    Brilliant. Looking forward to continued progress in your work on a opamp-less Purifi 1ET400A idea.

    1
    Mike
    May 24  ·  Edited: May 24

    Here's the Purifi Audio 1ET400A beside the Hypex NC-500

     

     

     

     

     

    Quite a family resemblance!

    0
    bluesaint
    Loyal Supporter
    May 24

    Reading the spec, so power wise, it seems around 150-200w @8ohm?

    0
    Mike
    May 24  ·  Edited: May 24

    @bluesaint Spec sheet says 227w @8ohms with 1% THD. However it jumps up to 1% THD very fast. So at 180W output it will still be very clean. I'm going to make the Puremusic like the Puremusic Jr so with 100% volume output in Roon, the amps won't ever reach 1% THD or clip.

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    Mike
    May 24

    So if you look at the power plot, the Puremusic at 100% volume in Roon will be around the 0.01% THD+N level with a full 0dBFS signal:

     

     

     

    You don't want to drive them any harder than that anyways.

    0
    Audiogeek
    Loyal Supporter
    May 24

    So max output in Roon is better than fixed output for driving amps with volume control?

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    Mike
    May 24

    You mean a 64 bit floating point digital volume control is better than an analog one? Yes of course. 100% lossless and transparent with nothing added to the signal path. This is why I hate preamps. Well that and all of the extra connections, gain stages, PCB traces etc. A total nightmare for sound quality.

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    bluesaint
    Loyal Supporter
    May 24

    @Mike Btw, on PMJ and Roon, what's best config to use? ie. turn on Roon DSP volume, and set iphone SE hw volume at max and control all volume via DSP volume?

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    Mike
    May 24  ·  Edited: May 24

    @bluesaint No you don't need to set anything up. Just leave it at the default settings (device volume control). It bypasses the iPhone volume control anyways.

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    Mike
    May 24  ·  Edited: May 24

    Actually I'm playing around with this again. I thought there was a reason I was keeping it on device volume. But now that you mentioned it again I'm going to do more listening tests comparing DSP volume setting with device volume. I've been through this before but it was a while ago. We can continue this on the Puremusic Jr listening impressions page.

    0
    Mike
    May 28

    My Purifi amps ship from Denmark tomorrow! I'm going on a small trip from Friday till next Tuesday. They'll be waiting for me when I return. Expect feedback next Wednesday.

    2
    Mike
    May 29

    My Purifi amps have shipped!

    1
    Mike
    Jun 5

    My Purifi modules are here. Just need to grab them from my mailbox. I'll be listening to them tonight!

    1
    bluesaint
    Loyal Supporter
    Jun 5

    can't wait for your initial impressions!

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    mfbolek2112
    Loyal Supporter
    Jun 5

    Purfect....

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    Mike
    Jun 5  ·  Edited: Jun 8

    Look what I have here. Nice to see genuine German Wima and Japanese Rubycon caps. In contrast, Hypex uses Su'Scon caps out of Taiwan.

     

     

     

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