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davewantsmoore

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davewantsmoore last won the day on February 14 2017

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About davewantsmoore

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    Log! It's big, it's heavy, it's wood.
  • Birthday October 16

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    Hobart
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  1. davewantsmoore

    Magico Q-Sub anyone?

    No, doubt... otherwsie they'd be doing something different
  2. davewantsmoore

    Let's talk jitter.

    It really depends on the intermodulation of the distortion products (ie. depends on the music signal ,and how complex it is) .... and how this could lead to the distortion being unmasked. Thankyou Papa, this is what I was trying to say. It also applies to jitter.
  3. davewantsmoore

    Azura Bass Horns

    ?!? There's no bass horn in those pictures
  4. davewantsmoore

    Let's talk jitter.

    This seems plausible to me .... not so much because one might be bigger than the other .... but the jitter from "other sources" is more likely to burst to large levels for very short periods.... or vary in some other sort of way.
  5. davewantsmoore

    Let's talk jitter.

    These files bear no relationship to jitter in a digital audio signal.
  6. davewantsmoore

    Magico Q-Sub anyone?

    The only "independent" clarification Magico offer on their website, is this: https://www.soundstageglobal.com/index.php/shows-events/ces-2015-las-vegas-usa/175-ces-2015-features/548-ces-2015-mirage-listening-impressions-magico-q7-and-qsub-18
  7. davewantsmoore

    Magico Q-Sub anyone?

    This
  8. davewantsmoore

    Magico Q-Sub anyone?

  9. davewantsmoore

    Magico Q-Sub anyone?

    I think you misunderstood what I did to determine that 136dB was a bold claim. The difference is between theoretical and practical limitations. It's less about confirming to "some standard" .... and more about simply providing enough information to be able to to meaningfully interpret the published result. I can't compare this subwoofer result to any other result.... not because it wasn't done to "some standard"... I could convert their result to "some standard" .... but we just don't know enough to interpret it at all. Yes, this subwoofer is just another version of that type of thing. I think "the internet" ... and the "rise of fake-experts" ..... is a poor excuse for why manufacturers don't publish data that can be interpreted .... or that reviewers don't investigate products in useful ways.
  10. davewantsmoore

    NBN SkyMuster satellite experience

    If you do two seperate speed test sites, then the faster one is the more valid one for testing your actual satellite connection bandwidth. However.... if you do a bunch of other speed test sites.... all over the world (or wherever) .... and some of them are slower than the fastest one. What this represents is that your ISP is not transmitting data to those destinations as fast as your satellite connection can handle. Hypothetical numbers: speedtest.net 25mbps speedof.me 8mbps somewhere 16mbps elsewhere 3mbps Looking from you... back into the internet..... you have: You > SkyMuster in the Sky > NBN Point of Interconnect > Your ISP > The SpeedTest Sites on the Internet. If any of those speed test sites is able to get 25mbps to you ..... then that says that the bit between you and the NBN POI (ie. the satellite bit ... ie. the NBN) works at 25mbps. If another site is not able to get 25mbps to you .... we know that the satellite bit is able to work at 25mbps .... so the fault lies with your ISP not sending and receiving data to/from either the NBN POI, or the internet ..... for that site. It is common for ISPs to makes sites/content fast or slow..... NBNCo can't do this, because they can't tell what you're looking at. I hope that helps, it was a bit of a ramble. This seems a little strange. "Snappiness, or time to load" doesn't tell you very much about "how many mbps you can transmit". What will tell you whether it's 8 or 25 .... is to download (or upload) data, and look at how many mega bits per second it can transmit. [which is exactly what a 'speedtest' site is doing]
  11. davewantsmoore

    How variable is your mains voltage?

    Sure, but that's typically between two seperate vibrating strings .... and it's audible because you can hear the beat frequencies. That's quite different to the whole audio shifting up and down in pitch by 5 cents..... a lot of things would need to conspire to make that audible. Unless you were a freak with super-perfect pitch.... but then those people are freaked out by most recordings (even ones which don't vary like we're talking about)
  12. davewantsmoore

    $10K!!!!! Speaker Cables

    Impressive cable... reminds me, I have to get APC new album.
  13. davewantsmoore

    Let's talk jitter.

    I typically think that too much is made of this - probably because it's the bits which analogue-audio people can get their head around. The real bits are the (re)clocking and power supplies for the digital bits... but people like Terry can talk more about that in details.
  14. davewantsmoore

    Let's talk jitter.

    Yes, it's clear that people do that (so there's no need to evidence) ..... but "why" is more pertinent. "Certain distortion sounds a certain way" (so we should try to achieve the more pleasant sounding distortion) is a somewhat oversimplification of what is happening. The profile of the distortion frequency components tell us things about the non-linearity in the amplifier which caused it. The benefit of targeting a certain distortion profile isn't about that distortion being "good sounding", but more about not letting certain types of non-linearites occur in the circuit. Because they don't have zero distortion.... or some other condition (aside from actual distortion of the audio) is causing the audibility. NLD from jitter is typically at a very low level ..... but is at frequencies potentially well away from the signal. In a lot of cases it would not need to rise far to be unmasked. If a DAC were "fine most of the time, but with a very jittery instant here and there" the typical ways jitter is quantified wouldn't show that. As mentioned earlier.... Correlation into a certain channel seems to be a big way distortion can be unmasked .... which is specific to digital audio due to the very high channel separation possible.
  15. davewantsmoore

    Let's talk jitter.

    I do not think that good amplifiers tune the harmonic distortion "profile" the way they do, because harmonic distortion sounds better that way. The real reason is to do with the cause of the distortion .... and what the distortion profile says about the cause. "monotonically decreasing" distortion .... or other "benign" spectrum of distortion components in an amplifier mean that the thing causing the distortion isn't so bad..... where as certain distortion components "sticking out" mean that the type of non-linearity in the circuit is more severe, and more "tuned" (which could be set off, by specific input signals)..... and hence be more audible under specific conditions.
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