• RE: The MMG Harmonic Distortion Conspiracy Theory...mostly tongue-in-cheek, long - Davey 09:32:47 03/22/15 (5)
  In Reply to: RE: The MMG Harmonic Distortion Conspiracy Theory...mostly tongue-in-cheek, long posted by old guy 42 on March 22, 2015 at 09:26:43

  A mostly tongue in cheek Harmonic Distortion Conspiracy Theory that's not really a conspiracy. Got it. :)

  Isn't it obvious that my "engineering dogma" is interested in the part that's NOT tongue-in-cheek? :) My goodness.
  What did you do to solve this problem? Or are you still experiencing it? Those are the real questions here.
  If I had the transducer in my listening room I could certainly find the issue for you, but it's a bit difficult to troubleshoot via forum messaging with all sorts of irrelevant information included.

  He did make mention that your two tests were done on different days. It's possible that may have invalidated your testing scheme. This type of thing requires a strict discipline in testing if valid conclusions are to be made. So, it's possible your transducer has no problem.....just the inherent distortion.
  Make sense?

  Dave.
  

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  Edits: 03/22/15   03/22/15   03/22/15

  • RE: The MMG Harmonic Distortion Conspiracy Theory...mostly tongue-in-cheek, long - JBen 10:37:58 03/22/15 (0)
    In Reply to: RE: The MMG Harmonic Distortion Conspiracy Theory...mostly tongue-in-cheek, long posted by Davey on March 22, 2015 at 09:32:47

    Davey, let's just get to the park's cafeteria and have a coolin' drink, my treat.
    
    Yes, if I had that MMG here it would have been easier to apply more resources and find out sooner. As it is, OG42 has done a remarkable set of measurements and tests without the benefit of more resources. At the very least we know some fundamental measurements. The latter are not just the REW ones but also some structural items of interest. We will detail them as best we can soon. I need to take care of other things today.
    
    Now, you added an edit even as I replied. Your last paragraph is new, and I am glad you added it for it also speaks to our level of transparency. On the part where you say " This type of thing requires a strict discipline in testing if valid conclusions are to be made. So, it's possible your transducer has no problem.....just the inherent distortion."
    
    Yes. I may have shortened things on edit and accidentally dropped mentioning that these are far from the only, or best, measurements that we took since we began. They were simply the ones "at hand" and with enough common elements. The ones on March 13 got partially corrupted and I though I would show what can happen when noise is ignored. Importantly (in this case) despite the noise intrusion on March 13, even the noise cannot hide the distortion that we have always found in cleaner measurements. Old Guy 42 did take an extra read of the sine wave ditortion at 115Hz on March 15, which I included first, on the post itself.
    
    I tried to include relevant details -- even those that may seem as "invalidating". Tests were repeated along time precisely because the vagaries of in-home measurements do present challenges and easy mis-direction. We have no anechoic chambers. Personally, for critical items, I can only be sure after testing several times along time. This is one of those rare instances when -- despite notable environmental changes -- it keeps looking like a duck and quacking like one all the time.
    
    

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  • RE: The MMG Harmonic Distortion Conspiracy Theory...mostly tongue-in-cheek, long - old guy 42 10:29:13 03/22/15 (3)
    In Reply to: RE: The MMG Harmonic Distortion Conspiracy Theory...mostly tongue-in-cheek, long posted by Davey on March 22, 2015 at 09:32:47

    You know Dave, if your "engineering dogma" is NOT interested in "tongue-in-cheek" why did you not cut to the chase and answer JBen's OP???
    
    
    As far as irrelevant info. goes...What part of " I checked for de-lam and I also checked for loose XO parts" qualify for irrelevant info??? Are you just taking pot shots at other posters??? I thought you were only interested in "engineering dogma".
    
    Other things I have tried is to add rope caulk to the frame/driver. I also noticed an odd placed staple on the top of the one in question. I have plans to loose the staples and find another way to fasten the driver to the frame.
    
    ALL my sweeps were done in the same spot, and at the same height. I think JBen's OP tells the story pretty well with my experience.
    
    
    If you want to continue, how about just the "engineering dogma" part of this thread, OK???
    
    
    

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    • RE: The MMG Harmonic Distortion Conspiracy Theory...mostly tongue-in-cheek, long - Davey 11:30:18 03/22/15 (2)
      In Reply to: RE: The MMG Harmonic Distortion Conspiracy Theory...mostly tongue-in-cheek, long posted by old guy 42 on March 22, 2015 at 10:29:13

      I'm not sure what the "cut to the chase" answer you're looking for is. You guys are the ones who had the firsthand experience, made the measurements, and determined the higher distortion. It's not clear to me what the cause of that issue is.....or whether it was an issue at all. I could make something up if you want. :)

      Checking for delam....noting odd-placed staples....trying rope caulk....investigating better fastening. All good steps and that IS good relevant information. It's information that is interesting/valuable and helps to possibly narrow the issue. "Engineering dogma" were not my words....I hope you caught that.

      Why is it so difficult for JBen to approach Magnepan discussions/postings without resorting to strawman arguments, or looking down his nose at my engineering discipline, or taking cheap shots at my hearing ability, or etc? It's a mystery to me.

      I'm glad to help you guys if I can....and I don't having my technical statements and technical speculations questioned. But please don't insult my intelligence with the other stuff.

      Cheers,

      Dave.

      
      

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      Edits: 03/22/15

      • RE: The MMG Harmonic Distortion Conspiracy Theory...mostly tongue-in-cheek, long - old guy 42 12:09:59 03/22/15 (1)
        In Reply to: RE: The MMG Harmonic Distortion Conspiracy Theory...mostly tongue-in-cheek, long posted by Davey on March 22, 2015 at 11:30:18

        WOW...In a previous post to me you posted that you never experienced this "bump" in an MMG, correct? If you re-read JBen's OP you will find that he posted his 1999 MMGs did NOT have this "bump" either. He asked if
        anyone with experience with this, to post their findings. Why did you NOT "cut to the chase" and tell him what you told me without all your prose.
        
        No one is insulting you, Dave. It's clear to me you have an ax to grind. That's sad, truly sad. This Planar Asylum is a GREAT source of info for me, but I dislike your posts to inmate JBen.
        
        Anyway, thanks for the info and I'm "over and out"...old guy
        
        
        
        
        
        

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        • RE: The MMG Harmonic Distortion Conspiracy Theory...mostly tongue-in-cheek, long - Davey 13:37:08 03/22/15 (0)
          In Reply to: RE: The MMG Harmonic Distortion Conspiracy Theory...mostly tongue-in-cheek, long posted by old guy 42 on March 22, 2015 at 12:09:59

          No, I said I haven't noticed higher distortion levels between left/right speakers and/or different sets. I said nothing about "bumps."
          That doesn't totally address your possible issue/problem noted here....just relating my distortion experience....which is what you asked me about.

          I think maybe you better look at the other (not mine) posts in this thread to experience all the "prose." :)

          If you can't see the insults then you're blind....or dense...or something else.

          Dave.
          
          

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          Edits: 03/22/15

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