Recent content by Duke LeJeune

  1. Duke LeJeune

    2-Channel Subwoofer Integration

    The ears cannot detect the presence of bass energy from less than one wavelength, and cannot detect the pitch of bass energy before hearing several wavelengths. So the perceived onset of transients is not a subwoofer frequency phenomenon; it happens much further up the spectrum. To put it...
  2. Duke LeJeune

    Speaker Recommendation up to 70K

    Emerald, if you haven't seen it yet, here is a video tour of the 2019 Munich show, which I believe was recorded by Bonzo. No Zellaton, unfortunately, but Vivid and Marten and Wilson and Goebbel and Kharma. Edit: That should be "Bonzo75". Not that other Bonzo.
  3. Duke LeJeune

    KeithR's "Dream Speaker" Search

    When you can hear the acoustics change from one recording to the next, the speaker+ room combination is allowing the venue cues on the recording to dominate over the "small room signature" cues of the playback room, something easier said than done. I tip my virtual hat to John DeVore. Arguably...
  4. Duke LeJeune

    The AudioKinesis Bohemian 215 design notes (more teaser content)

    We have no plans to show in Munich, unfortunately.
  5. Duke LeJeune

    What's best in highly sensitive/efficient speakers.

    "Ferrite magnet" = "Ceramic magnet". I think so, though it's possible that Coherent Audio has their own custom version. That would be my guess. I think it was called the "Lumina". Thank you very much! We're excited about it too, but unfortunately the Bohemian 215 will inevitably be...
  6. Duke LeJeune

    What's best in highly sensitive/efficient speakers.

    Disclaimer: I'm a speaker manufacturer. Please take everything I say with a grain of salt. Eyeballing John Atkinson's measurements, the impedance curve of the Volti Rival does not look particularly SET-friendly to me. The minimum is 3.3 ohms, and there is a more-than-20-ohm peak around 3kHz...
  7. Duke LeJeune

    SET amp owners thread

    I'm a recipient of one of those semi-production pairs, which has since been forwarded to the next person (who told me that he is buying the pair). In my opinion this new Class D amp sounds like Ralph's OTL amps. The difference is, the way it interacts with a loudspeaker's impedance curve is...
  8. Duke LeJeune

    “You Are There” Absolute Sound: Can We Get There From Here? Part IV

    Imo Harman's study of the relationship between loudspeaker preference and objective measurements is superb for what it does, but there are things which it does not do, such as: - The single speakers auditions were conducted with the speaker located along the centerline of a 22-foot wide room...
  9. Duke LeJeune

    SET amp owners thread

    The more important consideration is that information be presented in a way which is USEFUL to the end user. The convention of expressing efficiency in decibels at one meter for a 1 watt input, and sensitivity in decibels at one meter for a 2.83 volt input, provides ALL of the relevant...
  10. Duke LeJeune

    SET amp owners thread

    The following is just my opinion. It is nasty impedance curves and low efficiency which make life difficult for low-powered amps, rather than the crossover parts count in and of itself. The amplifier sees the load, not the number of crossover parts, and in some cases additional crossover parts...
  11. Duke LeJeune

    Ron's Speaker, Turntable, Power and Room Treatment Upgrades

    Not having heard the Pendragons, this is what comes to mind: There are of course competing schools of thought in loudspeaker design, and the fullest expressions of these competing schools of thought show up in the top models from those few companies which create genuine engineering-department...
  12. Duke LeJeune

    SET amp owners thread

    Excellent question! The following is my understanding, and I DO NOT claim it to be a complete understanding of the subject, but several paragraphs in we will encounter a factor which often gets ignored: If we go from one driver to two, wired in parallel, assuming a voltage-paradigm amp, we get...
  13. Duke LeJeune

    State of the Art Bookshelf/Standmount Speakers

    Would these speakers be going on dedicated stands, or would they be sitting on a shelf of some kind? Up against the wall, or out in the room somewhat? Do you have an idea of what ballpark dimensions would be practical? Is the top priority "best possible sound throughout the room", or "best...
  14. Duke LeJeune

    Trying the ZR Acoustics Panels

    Notice that I made no attempt to explain what might be happening in terms that DHDI uses. I started out with this question in mind: "IF this geometry DOES have a significant beneficial effect, how MIGHT that happen?" Chances are I am wrong of course.
  15. Duke LeJeune

    Trying the ZR Acoustics Panels

    Not that I have a dog in the fight, but imo one way the DHDI panels MIGHT work is by de-correlating the back-and-forth movements of the air molecules which normally oscillate in unison to create the compressions and rarefactions that make up a sound wave. I'm not acoustician enough to think...

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