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shadyJ last won the day on March 20 2017

shadyJ had the most liked content!

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About shadyJ

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  1. If you think the PB16 Ultra sounds bad, you are very lucky never to have been exposed to a truly bad subwoofer. The fundamental performance of it is pretty good, and it's amazing how much clean deep bass they manage to get out of a 15" driver. In conclusion, you are out of your mind.
  2. I don't think anyone on this forum is in danger of buying some Beats headphones, but thanks for the heads up. I too would be looking at AKG, Sennheiser, JBL. I have some Denons at the moment that are quite good.
  3. shadyJ

    KRK Systems 12S2

    It is sad that this subwoofer meant for recording is a much less linear device than many home audio subwoofers in its price range. You would expect the opposite to be true. It looks to me like it was meant to just plug and play with some active monitors, and was never really intended for a system with more than rudimentary bass management. It is only meant to give the low end of monitors some bass and who cares how accurate it is. I have to wonder how much prosumer gear is this mediocre.
  4. Magico already has their aluminum subwoofer. The cabinet is a 500 lbs aluminum block. Concrete wouldn't be 'exotic' enough. I am thinking.. marble. Make that sucker weigh a full ton. Say the marble has "micro-resonance diffusion properties" and charge $50k for one.
  5. Sure there are lots of speakers over 30k, but subs alone? Although I am sure any of these companies are willing to cook you up a super expensive sub if you asked.
  6. I don't know of a more expensive subwoofer than that Magico sub. There is the Wilson Thor's Hammer, but that is only $25k. What other subs cost north of 30k? That can't be a long list.
  7. There aren't too many subs that cost over 30k. The only one I can think of off the top of my head is the Magico one that uses two Aurasound NS18 drivers. I wonder which sub you are referring to?
  8. shadyJ

    B&C 21DS115

    This has been something I have always wanted to do as well. A real qualitative subwoofer comparison would have to be done outside (or in a room as large as an indoor stadium). Also, as you say, the equipment would have to be hidden. That is the only real way to fairly compare subwoofers, at least with human ears. They would have to be compared using fast A/B switching between the subs as well, at least for complex signal content like regular movie or music content. The problem is, GTG's are all about having fun, not rigorous testing. I wouldn't want to ruin a GTG by insisting on rigorous adherence to a strict testing regimen. GTG's are usually about drinking a lot of beers and seeing how loud some speakers get, and that is fine, but this kind of testing wouldn't work for that kind of gathering. I would want to see if these subs can be distinguished when they are operating well within their linear ranges. SME seems to think that there would be a difference. I don't think there would, but such a test, if conducted appropriately, would certainly serve as good evidence one way or the other. Neither SME or myself would be able to properly participate, because we already have predispositions that a blind test could not overcome. Still, I would love to hear it for myself. I need to secure some kind of grant to do this with.
  9. shadyJ

    B&C 21DS115

    Ilkka Rissanen and Ed Mullen did a study of IMD in subwoofers and found that subs with low THD also have low IMD. You can read about it here, if you don't already know about it. It is not a surprising result really.
  10. shadyJ

    B&C 21DS115

    Look at the subject from the perspective of sound pressure waves. As long as the driver is turning the voltage signal into sound pressure waves at a 1:1 relationship, it is a perfect reproducer. Anything else is distortion, whether linear or nonlinear. If you have no linear distortion and you have no nonlinear distortion, you have perfect accuracy. Of course, that is the unattainable ideal, but a very good system can get close. With effort, you can get a very flat response that has insignificant distortion quantities. What difference does it make if that is achieved through a $5k super driver or a $30 buyout driver from parts express? A good driver, when it is operating at nominal levels, can have distortion quantities of 1% or less and so is inaudible. If the frequency response is flat, and it isn't making any mechanical noise like flutter noise, there is nothing else that can distinguish these units, so long as they have the same dynamic range.
  11. shadyJ

    B&C 21DS115

    Wait a minute, are you saying the subjective and ambiguous term 'sound quality' can't be absolutely defined by a single number?! Heresy!
  12. I am interested in seeing these statements expanded, so I am looking forward to your post on this subject.
  13. I was thinking when I looked at all the results that must have been a brutal day of testing or spread out over many days of testing. Heck, I think just testing all the modes of a variable tuned sub is a pain in the ass, and what you tested took many times that amount of work. I hope you wore sunscreen. Anyway, great job, and incredible sub. 130 dB at 30 Hz is insanity! bravo!
  14. I largely agree with these points. In favor of a dual opposed box, it can cost a bit less than having the same arrangement in two separate boxes. However, that doesn't outweigh the cons you listed. I don't think phase issues are a serious disadvantage with dual opposed though, however, obviously you do have more control with how the room handles the frequency response with separate enclosures, and that far outweighs the advantages of dual opposed when everything else is equal. Another point I want to make is that dual opposed does not eliminate cabinet vibration- it cancels out cabinet rocking motion. If anything, dual opposed would make panel vibrations worse, but it doesn't take a lot of internal bracing to make panel vibrations a non-issue in subwoofers. For the home theater oriented subs, I think dual opposed gets some attention from those who just think bigger is better and just want a big sub, period. For the hi-fi market, those manufacturers are banking on the "vibration cancellation" aspect of dual opposed, and are also trying to get as much output out of a small enclosure as possible. Bowers and Wilkins have just gone this route and have recently announced three new dual opposed subs at their high-end. IF the drivers are light and powerful enough to deal with a small enclosure size, than I think dual opposed makes sense, for those who can only have small cabinets but still want some output. One dual opposed subs that I think makes sense is Funk's 18.2 subs, but they have a light driver that is powerful enough that it can handle a small space without being badly compromised.
  15. Nothing is ridiculous when it's in the name of SCIENCE!
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