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  1. kareface

    Why Some Audiophiles Fear Measurements

    I largely agree with this. I'm also skeptical of things that claim to change the current paradigm. I've seen lots of data that doesn't fit the current model until more research has been done, then everything seems to fit together nicely. New information is great, but with out a great...
  2. kareface

    Why Some Audiophiles Fear Measurements

    What's with everyone's inbox being full on this forum. Do people have that many messages or is the allotted space just super small? Greg, delete a few messages when you get a chance.
  3. kareface

    Why Some Audiophiles Fear Measurements

    I wasn't responding to that comment, I was responding to one of your many replies (that was likely generated by replies to your original comment) that contained a slightly less restrained position. I don't care what an individual does, only what gets widely propagated. There is too much...
  4. kareface

    Why Some Audiophiles Fear Measurements

    It clearly wasn't: It really depends on the environment. Some will have dramatically greater impact on reproduction. I would agree that in normal listening rooms the impact won't be that high, but most people who work in the field agree that it's greater than 50% in home listening spaces. A...
  5. kareface

    Ultra thin highly effective membrane resonator in the near future?

    http://www.popsci.com/technology/article/2010-02/ultra-thin-noise-cancelling-panels-shut-out-bass
  6. kareface

    Why Some Audiophiles Fear Measurements

    If you read the context carefully, it's not you I called silly. It's the reasons you mentioned in one of your prior posts I'm referring to. Not doing something beneficial because it might be a fad is a bad reason not to do anything. I never called you ignorant, I never said you didn't have a...
  7. kareface

    64 Cell (8x8) PRD (Skyline Diffuser) question

    In case anyone was curious, the panels are finished. Still working on the bass trap and haven't started the resonators.
  8. kareface

    Why Some Audiophiles Fear Measurements

    "What is asserted freely, is denied freely." is about as close as you can get. It means something asserted with out proof does not require proof to reject. It's nice to see someone who understands the aphorism.
  9. kareface

    Why Some Audiophiles Fear Measurements

    I would actually wager they don't, I don't remember 1/2 the conversations I have until I go back and reread them. I've seen a lot of neat things that have developed in acoustics. But that isn't really the issue at hand. There's never been a time where well thought out acoustical treatment...
  10. kareface

    Why Some Audiophiles Fear Measurements

    Wow. I'm almost speechless. Explain what aspect of acoustics is a fad? A) Sound interacts with the environment it's generated in. B) Making some adjustments to that environment will change that interaction. As long as you have rooms, speakers and air, you'll need some treatment. Bass...
  11. kareface

    Why Some Audiophiles Fear Measurements

    Don hit the nail on the head. Specifications aren't designed to do anything other than promote a product. They frequently don't represent real world situations or are distorted to provide a positive impression. Measurements represent data, specifications is how a select portion of that data...
  12. kareface

    Why Some Audiophiles Fear Measurements

    Oh god yes. Dogma is a plague on most societies, mostly because it's associated with faith (I'm referring to beliefs that lack evidential support, not specifically religion, even tho religion is one of those beliefs). If you don't have objective grounds to support your opinion there's no...
  13. kareface

    Why Some Audiophiles Fear Measurements

    You would recognized that even things we don't have an standardized method of measurement still produces notable differences in measurements? Even if there's no metric there are clear differences in output when you swap a driver, turn the speaker, use a different amp, change your listening...
  14. kareface

    64 Cell (8x8) PRD (Skyline Diffuser) question

    It's obviously a series of smaller QRD's rotated then placed at different heights. The structure is arranged in an 8x8 pattern of QRDs, and it's clear that low cutoff isn't dependent on any individual QRD's cell depth or period width. I can't think off hand of any combination of QRD patterns...
  15. kareface

    Why Some Audiophiles Fear Measurements

    What I've found is things that don't manifest in measurements are usually truly rare and are usually resolved under scrutiny. The reports you describe I would wager are 1000/1 psychoacoustics, if not greater.
  16. kareface

    Why Some Audiophiles Fear Measurements

    They are a great group, you'll be better off in the long run going that route. :)
  17. kareface

    Why Some Audiophiles Fear Measurements

    Just don't get too aggressive with open faced panels. Mids and highs are directive, if you don't leave a lot of surface area for them to be absorbed they'll remain largely unchanged. You should use some panels tho, it'll take more than a 3-4 before you'll see any problems with over dampening...
  18. kareface

    Why Some Audiophiles Fear Measurements

    First, I want to clarify for my benefit that you're suggesting that excessive EMI suppression produces an audible change to the system that can be identified at confidence through ABX testing that wouldn't manifest in any measurements? I don't take issue with your credibility but I am curious...
  19. kareface

    Why Some Audiophiles Fear Measurements

    Think about it like this, everything you hear is influenced by the environment the sound originated in. If you take a small tape recorder and walk around in different environments while talking into it, even the poor quality microphone and speaker on it can give you a sense of how influential...
  20. kareface

    Why Some Audiophiles Fear Measurements

    It's actually pretty widely agreed upon. Here's the problem, I'm not talking about the debate over what measurements represent classic audiophile cliche phrases (i.e. the speakers sound lightly musical and encompassing), I'm talking about comparing the FR, waterfall or CSD, IR, Harmonic or IMD...
  21. kareface

    64 Cell (8x8) PRD (Skyline Diffuser) question

    Sorry if I misinterprated your comment, it's just hard to imagine that in a positive context. I'll take a look at the design when I get a chance, I really wish the images of it were a little larger, lol.
  22. kareface

    Why Some Audiophiles Fear Measurements

    I personally only mind it when Audiophiles promote snake oil. I've measured & calibrated quite a few systems, I don't really mind if people prefer the sound of something that doesn't reproduce accurately, this has to be taken into account when calibrating. I don't really mind anything that...
  23. kareface

    64 Cell (8x8) PRD (Skyline Diffuser) question

    I don't see a context where that would make sense. Unlike your posts where there was some ambiguity about the tone, I didn't see that here. I assumed that's what he meant at first, but I was unable to see a way the context represented it. Something dawned on me. You know why the values...
  24. kareface

    64 Cell (8x8) PRD (Skyline Diffuser) question

    That came out rather obnoxious of you. First, you are making the assumption that somehow after working out the values for the diffuser width I wouldn't have the low cutoff. Second, it doesn't change the fact the values in the citation are wrong, which was exactly what I was pointing out. I...
  25. kareface

    64 Cell (8x8) PRD (Skyline Diffuser) question

    Let me start by mentioning I own a hard copy of that book, that wasn't what I was referring to when I was asking where you got that idea from. Something's odd about what you posted, the period widths don't match the cell widths. A QRD that's N=7 with a target low of 500hz and has a well...
  26. kareface

    64 Cell (8x8) PRD (Skyline Diffuser) question

    At this point in the thread we're just debating the hypothsis of using mutiple diffusers which are desgined to be effective to a target frequency, but are limited based on their surface area, if they will still scatter when used in conjunction. Sure, I can bring some calibration hardware with me...
  27. kareface

    64 Cell (8x8) PRD (Skyline Diffuser) question

    Where did you read that it was from an array of 20 or more? I might of missed something, but everything I read suggests that he's only using 2 diffusers in the test. Now that I think about it, the diffusion coefficient values in the graph you posted for a QRD of that width are what you would...
  28. kareface

    64 Cell (8x8) PRD (Skyline Diffuser) question

    I think we are talking about different products. If my memory serves me it was a rigid plastic, not a foam. You keep posting quotes that don't have any bearing on your argument. This once again does not prove your point. I've agreed many times over that cell depth and period width are...
  29. kareface

    64 Cell (8x8) PRD (Skyline Diffuser) question

    Oh, the 'we' is a guy I helped out a few months back. He's a retired PhD in Environmental Fluid Mechanics & he's been designing his own speakers the last couple years. He wanted to build a low budget anechoic chamber. I helped design the space and suggested how to go about dampening to that...
  30. kareface

    64 Cell (8x8) PRD (Skyline Diffuser) question

    Are you talking about the fiberglass testing? IDK why that would be considered 'studio stuff'. The test is to verify the functionality of using lower density fiber as an LF resonator. I was talking to Ethan about it and wanted to provide some A/B comparisons. It's really difficult to test...

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