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    Tedeschi Trucks Band

    Wow, that was great! Thanks for posting it.
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    Destructively Driving Modes

    One must never presume to know the answer to a question when one's living depends on not knowing it.
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    Destructively Driving Modes

    Lol!
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    Destructively Driving Modes

    You can do that if you like as well. The key thing is that the user specifies what filters (if any), gains and delays are to be used. It doesn't try to figure out what filters are needed, but only tries to optimize the parameter values of the filters (or gains or delays) entered by the user...
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    Destructively Driving Modes

    The first step shown above (whose result is the second graph) adjusts individual gain, delay and EQ individually for each sub, the whole kit and kaboodle at once. The optimization is a weighted RMS sum of all listening positions, so the main listening position may get compromised a bit because...
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    Destructively Driving Modes

    Thanks for pointing that out. I've been having this weird problem off and on with the file getting dropped from my web provider without notice. I re-uploaded it, so it should work now. The best way to find out about it is to read the tutorial and the help contents. See also the tutorial PDF...
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    Destructively Driving Modes

    In another forum, Michael asked this question: The article can be found here. That article isn't about audio at all though, but about a general-purpose global optimization algorithm. This type of algorithm attempts to minimize what's called the objective function of the problem to be solved...
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    Destructively Driving Modes

    Yes, I think it may be AES convention presentation vs. final article. I don't have AES access so I can't check it. The one I referenced was made available freely by them for a time, but it looks like it's behind a paywall again.
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    Destructively Driving Modes

    I was referring to a third one, Low-Frequency Optimization Using Multiple Subwoofers, which describes the SFM algorithm, at least how they conceived of it at the time.
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    Destructively Driving Modes

    It is a mono source signal, but after it is split into multiple paths, there is one adjustable PEQ, one adjustable delay, and one adjustable gain per channel. These are adjusted to minimize the Mean Spatial Variance of the combined sub outputs. Table 3: Gain: 0, -6, -12 dB Delay: 0, 5, 10...
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    Destructively Driving Modes

    In Table 3 of Low-Frequency Optimization Using Multiple Subwoofers, Welti and Devantier specify that for each subwoofer channel, individual delays of 0, 5 and 10 ms are evaluated in the search grid.
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    Destructively Driving Modes

    That's me. :) A link to the program is in my profile, or you can just click my user name to visit my homepage. It requires time-synchronized measurements, so at present it can't be used with a USB mic. A loopback timing reference is needed. However, John Mulcahy is apparently working on...
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    Name your favorite Oscar Peterson album.

    My favorite is The Sound of the Trio. The CD has a great version of Scrapple from the Apple that's not on the original LP from decades ago. I generally don't like Oscar Peterson that much, but I always liked The Sound of the Trio from the first time I heard it long ago.
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    Audiophile Fundamentalism

    Other than the balanced/unbalanced interface concern, pro and consumer interfaces are not as incompatible as much of the misleading information on various internet forums would have you believe. Back in the days before CD, things like FM tuners had maximum output voltages as low as 150 mVRMS...
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    What are the sonic DISadvantages to EQ'ing bass ( & only bass)? Please be specific?

    The best answer I've seen about whether one can effectively EQ a response dip is in the Room EQ Wizard manual. There's this idea of "minimum phase" in system theory that relates to whether the inverse of a system transfer function is causal and stable. If both are true, the system is...
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    Is there a spec or a trustworthy definition of what a "high current" amplifier is?

    You can get a decent approximation of the peak current capability if you have access to Stereophile measurements of output power into two Ohms or the lowest impedance measured. You can calculate it this way: Ipeak = sqrt(2 * P / R) where P is the measured output power and R is the resistance...
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    Let's talk Miles Davis

    Anybody interested in finding out more about Miles as a person might enjoy reading his autobiography. I got a copy for Christmas a couple of years ago and enjoyed it immensely. I passed it along to my neighbor two doors down, who's a very good jazz alto player. He's since passed it along to a...
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    What's wrong with Drug Companies???

    Sounds to me like an industry for which deregulation and tax cuts are in order! :D
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    Measured Improvement or Non-measured Improvement?

    It's a messy question. If one measures smoothed steady-state on-axis frequency response in the statistical region (above Schroeder frequency) and EQs the result to flat, the subjective result will be horribly bright and harsh. This will be confirmed by quasi-anechoic on-axis measurements which...
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    Gizmodo Visit With Mikey

    LOL. That looks like the cover of Thelonious Monk Underground.
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    Do You Trust Research Findings? Perhaps You Shouldn't!

    Just have to post a link to one of my favorite web articles, "Science Was Wrong Before" LOL.
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    Preference vs. audibility - please keep them separate.

    Bob's book came out in 2011. I tried it briefly but did not spend much time with it. Keith's listening tests in that article were sighted. Using the foobar2k ABX comparator with it could be interesting. After measuring the bass response in my room, I've stopped worrying about amplifiers...
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    Preference vs. audibility - please keep them separate.

    That conclusion has been drawn often, and was drawn in Bruno's case before Bob Cordell published his power amplifier design book. It comes from the graph of distortion products vs. feedback factor originally provided by Baxandall. In it, Baxandall assumed the open-loop amplifier had distortion...
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    Preference vs. audibility - please keep them separate.

    The only experience I've had with a somewhat controlled listening test (and it was just a casual one) is the experiment described on one of Bob Cordell's pages. I couldn't tell the difference between the solid-state and tube amps (the latter of which was designed to have a low output...
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    Preference vs. audibility - please keep them separate.

    Yes.
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    Preference vs. audibility - please keep them separate.

    Current dumping was originally described by Peter Walker in the December 1975 issue of Wireless World*. While interesting and providing very good performance for its time, the measured performance claimed in the article has been far exceeded by conventional designs of today. There are other...
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    Preference vs. audibility - please keep them separate.

    For another perspective on feedback (from a tube amp designer) see this interview with Scott Frankland. He does a good job with the issue Tim brings up, but without resorting to complicated math.
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    Preference vs. audibility - please keep them separate.

    Regarding the frequency response tailoring, the purpose is to keep the amplifier stable while trying to get as much feedback as possible. What constitutes a "fast" open-loop amplifier is not what one might think at first. It seems at first that "fast" should be defined in terms of the...
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    Preference vs. audibility - please keep them separate.

    Yeah, that was great. The whole idea of equipment conveying emotion is an interesting one. For instance, which interconnect cable does the best job of conveying the righteous indignation of Dylan's early work? Would the personality of that cable be appropriate for conveying the subtlety of...
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    Constant Power

    It's pretty obvious that you have no clue what the meaning of "maximally flat" is, and that you are just bullshitting here.

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