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Thread: Minimum Phase Filters

  1. #11
    MartinT Guest

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    Quote Originally Posted by Primalsea View Post
    Basically this is nothing new
    It may not be new in the world of digital theory, but to my knowledge only Meridian, Ayre and perhaps one or two others have actually implemented it. The results are real and audible.

  2. #12
    Join Date: Feb 2008

    Location: http://www.homehifi.co.uk

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    Jeez, and there is me thinking that I was one of the first to use this technology starting with the TC-7520SE. The MLC5/6 mod changes the waveform to push ringing away from before the transient edge to after the edge. A pity I did not see the potentials to make quick buck by offering to do the mod, instead of publishing the details on how to do it. I reckon it would have been worth at least £50 in each case.

  3. #13
    MartinT Guest

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    Presumably the Caiman includes this mod? Interesting.

  4. #14
    Join Date: Feb 2008

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    The whole thing can easily be simulated in PSPICE, and then fine tuned by listening tests. I am aware that many manufacturers slap a massive price on even modest technical implementations that produce a modification of the audio signal.
    There are four main methods of filtering that have been used by equipment manufacturers since the early 80's in the audio circuit of CD players. However, sometime in the late 80's the magazine Elektor published a major breakthrough in CD filter design that pushed all of the ringing from below 21KHz to outside that frequency. What was so striking about their design is that it did not cause any phase shift.

  5. #15
    MartinT Guest

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    There's more. Now that the player has been running for over a week, two things have emerged: 1) voice is brought forward, vivid and startling against an inky dark background with detail realistically placed in a three-dimensional soundstage; 2) the bass is both further extended and impactful with almost frightening ability to start and stop. I do have speakers to make the most of this (and a detached house), but the feeling of structural solidity to the music underpins it to an incredible degree.

    I've learned to reel back over-the-top pronouncements when discussing hi-fi over the years, but I do want to say here and now that I've never heard better playback of standard CDs at any price.

    Just wanted to share

  6. #16
    leo's Avatar
    leo is offline Circuit Junkie & DIY Room Forum Leader
    Join Date: Jan 2008

    Location: Notts UK

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    One thing I learned with diy and fiddling with stuff, never be quick to judge a tweak until its had chance to run in a bit quite surprising how much difference just a little run in time can have
    Cheers,
    Leo

  7. #17
    MartinT Guest

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    I totally agree. When I bought my first SACD player (the battleship Sony SCD-1), I was warned that it needed a full 200 hours of operation to give its best performance. They were right, it need that and more - it just kept getting better as new parts burned in.

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