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RE: RE MMG tweets in 45 degree toe in...

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paul3

In Reply to: RE: RE MMG tweets in 45 degree toe in... posted by BigguyinATL on September 15, 2017 at 13:28:18

How does one confirm with complete certainty when her Magnepans are perfectly, optimally placed?

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RE: RE MMG tweets in 45 degree toe in... - Satie 10:29:38 09/18/17 (3)
You can use REW and a measurement mic to do an impulse response test - which will be a single sharp spike on the graph if you are properly time aligned, If not properly aligned then you would be having a smeared impulse or even emergence of a wide double topped graph.

However, that is not the only thing you want from a maggie - you might want to alter freq response from the one on axis in time alignment to compensate for a hard untreated room or soft sounding room with overly treated surfaces and big stuffed furniture.
- RE: RE MMG tweets in 45 degree toe in... - paul3 12:29:01 09/18/17 (2)
  I just downloaded the REW software (coincidentally I already have a Behringer mic), I'm mystified now, but am looking forward to learning how to use these tools. It will be a healthy exercise, especially since I'm more of a right-brain kind a guy. :)
  
  Thanks, Satie.
  - RE: RE MMG tweets in 45 degree toe in... - Satie 14:51:21 09/18/17 (1)
    For the right brainer perhaps the listening tests should do you more than anything else, namely that image specificity, location precision and image saturation, Images outside the inter-speaker space tend to pop out and align with the rest of the soundstage when you hit alignment. Depth dimension will also be enhanced. You should note on naturally recorded fixed mic recordings how a mobile soloist (violin flute etc) moves against say a piano accompaniment while keeping its image unsmeared as it moves.. Heifetz tends to move a lot in his DG recordings from the early 60s.
    
    Watch for the shape of drum kits and piano and the match of transient and decay locations on the drums and cympals, and the separate piano impact locations and extended decays and the broadening of the image as you go down the scales to the lowest notes of the piano. Ideally a solo piano recording will have fingernail tinks on the left and will expand to ~9 ft wide on the lowest bass notes. Sometimes you can localized the hammer hits on sforzando.
    
    Brass instruments should have that startling sound onset before the brilliance comes on.
    - RE: RE MMG tweets in 45 degree toe in... - paul3 16:09:24 09/18/17 (0)
      Satie,
      Thanks for your detailed response. I hope I have not "hijacked" this thread, but the topic of the numerous ways to position Magnepans and other planar speakers, comes up often.
      
      I have found, in my room, with my electonics, that my version of "limage" placement satisfies much of what you describe. That's why I was so excited about it!
      
      I will still investigate computer analysis, but for me, listening is the ultimate test.
RE: RE MMG tweets in 45 degree toe in... - watts 13:04:04 09/17/17 (1)
as far as a symmetry goes, put in Norah Jones, or Jennifer Warner, or Patricia Barber and you should see her voice dead centre. If not adjustments with either distance or toe-in need to be performed.
- RE: RE MMG tweets in 45 degree toe in... - Norman M 19:30:46 09/17/17 (0)
  I would grab any mono CD recording. Additionaly if srereo is required then a stepped stereo pan test CD: extreme L, midway to center, then dead center and on to the right side. I have
  used such a test CD, but it really doesn't answer the question. There might not be any answer.
RE: RE MMG tweets in 45 degree toe in... - Norman M 06:59:21 09/16/17 (0)
"How does one confirm with complete certainty when her Magnepans are perfectly, optimally placed?"

One has to wait until after they've died and gone to heaven.

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