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Thread: Herzan/Table Stable "Active" Isolation table.

  1. #1011
    Member Sponsor Addicted to Best! rockitman's Avatar
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    Quote Originally Posted by Mike Lavigne View Post
    if music is playing, it reads that sound as protected content; and won't allow open distribution. same way phone apps can figure out which CD it is.
    so you can't see it either ?
    Christian

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  2. #1012
    Member Sponsor Addicted to Best! rockitman's Avatar
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    Quote Originally Posted by rockitman View Post
    so you can't see it either ?
    well I am having a little lesson in youtube today, Hendrix astro man is copyrighted...
    Christian

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  3. #1013
    Quote Originally Posted by rockitman View Post
    well I am having a little lesson in youtube today, Hendrix astro man is copyrighted...
    Do you have a Grateful Dead bootleg album? That shouldn't be detected!
    Speakers: Vandersteen Model 7s, 4 M&K ST-150Ts, 1 VCC-5; Amplification: 2 Vandersteen M7-HPAs, CI Audio D200 MKII, Ayre V-6xe; Preamp: Doshi Audio Line Stage v3.0; Phono Pre: Doshi Audio Phono Pre; Analog: Basis 2200 Signature with Calibration Base, Vector 4 Tonearm, Lyra Etna SL; Reel to Reel: Technics RS-1500; Doshi Tape Pre-Amp; Multi-channel: Bryston SP-3; Digital: Custom PC> Lampizator Big 7 DAC, Oppo BDP-105;

  4. #1014
    Member Sponsor Addicted to Best! rockitman's Avatar
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    Quote Originally Posted by dminches View Post
    Do you have a Grateful Dead bootleg album? That shouldn't be detected!
    I will have to watch that copyright stuff. I could play some old classical 1958-1961 where there is no more copyright.
    That was an obscure cut of the song from Hendrix's recent 8 record box set pressed at Quality Records.
    Christian

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  5. #1015
    Quote Originally Posted by ddk View Post
    Hi Taiko,



    Just following instructions !



    david
    Ah yes I see where that went wrong! It should read this:
    "Isolation is of course not equivalent to damping. You would call the tablestable a damping device, but it isn't, it is dissipating vibrational energy by producing a counter force."

    Now this is in fact out of context as a single statement, as the isolation the tablestable provides is by means of A) destructive interference that cancels-out incoming vibrations for lower frequencies, the active isolation, but it also provides passive isolation by means of (spring) damping. If you disable the active isolation it would be a strictly passive isolating device by a mass/spring damping principle.

    The corrected sentence above strictly applies to the active isolation mechanism of the tablestable.

  6. #1016
    [Industry Expert] ddk's Avatar
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    Quote Originally Posted by Taiko Audio View Post
    Ah yes I see where that went wrong! It should read this:
    "Isolation is of course not equivalent to damping. You would call the tablestable a damping device, but it isn't, it is dissipating vibrational energy by producing a counter force."

    Now this is in fact out of context as a single statement, as the isolation the tablestable provides is by means of A) destructive interference that cancels-out incoming vibrations for lower frequencies, the active isolation, but it also provides passive isolation by means of (spring) damping. If you disable the active isolation it would be a strictly passive isolating device by a mass/spring damping principle.

    The corrected sentence above strictly applies to the active isolation mechanism of the tablestable.
    Ok . So the active part is reacting to vibrations it senses from the top plate?

    david
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  7. #1017
    Member Sponsor Addicted to Best! rockitman's Avatar
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    Hereís another vid. Used Shure MV88 into iPhone. Letís see if the central scrutinizer busts me for this 1960 classical content.
    https://youtu.be/_KlMAjdYp9A
    Christian

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  8. #1018
    Quote Originally Posted by ddk View Post
    Ok . So the active part is reacting to vibrations it senses from the top plate?

    david
    Most of the electronics including sensors are attached to the topplate but my understanding is there are also sensors mounted in the bottom structure.

  9. #1019
    VIP/Donor [VIP/Donor] microstrip's Avatar
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    Quote Originally Posted by Taiko Audio View Post
    (...) Now this is in fact out of context as a single statement, as the isolation the tablestable provides is by means of A) destructive interference that cancels-out incoming vibrations for lower frequencies, the active isolation, but it also provides passive isolation by means of (spring) damping. If you disable the active isolation it would be a strictly passive isolating device by a mass/spring damping principle.

    The corrected sentence above strictly applies to the active isolation mechanism of the tablestable.
    Although this mechanism can be used in some noise cancelling devices - they have a sensor outside the isolated volume and drive this volume with an out of phase signal created from the signal generated by this sensor, I am not sure that a similar technique is used in laboratory active tables - I had got the idea that the system is much more sophisticated than just destructive interference, particularly because the fixed part of the table is not an inertial reference. Do you know if there are any sensors in the upper part of the table?

    The best AFM (atomic force microscope) tables combine passive pneumatic and active piezoelectric - but surely at a much higher price!
    Under construction around the DCS Vivaldi 2.0 stack and a pair of Wilson XLF's : Forsell Air Force One, ARC Phono 2SE, cj GAT + Lamm M1.2 ref, TA OPUS MM2 +TA XL digital, TA XL gen V power cables and CenterStage footers ...

  10. #1020
    Quote Originally Posted by microstrip View Post
    Although this mechanism can be used in some noise cancelling devices - they have a sensor outside the isolated volume and drive this volume with an out of phase signal created from the signal generated by this sensor, I am not sure that a similar technique is used in laboratory active tables - I had got the idea that the system is much more sophisticated than just destructive interference, particularly because the fixed part of the table is not an inertial reference. Do you know if there are any sensors in the upper part of the table?

    The best AFM (atomic force microscope) tables combine passive pneumatic and active piezoelectric - but surely at a much higher price!
    Ok, I'll admit to having disassembled a TS-150 in a very early stage, out of curiosity, which is something nobody should do as I ended up having to return it to the factory for recalibration Without specifically focusing on this particular subject, I was more interested in the motor assemblies at that time, I did count at least 12 sensors, it's quite possible there are more, they are located on both the top plate and bottom structure. Which sensor serves which function I do not know and did not investigate.

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