• RE: "diffuse imaging"?? ... - Norman M 08:27:57 05/08/15 (4)
  In Reply to: RE: "diffuse imaging"?? ... posted by Satie on May 08, 2015 at 03:54:51

  "Big violin", Little Red Riding Hood: 'Grandmother, what a big violin you have', Wolf: 'all the better for you to hear me with'.
  
  I think it's possible for me to find recordings in my collection where the violin is normal sized, and even some where it's too small. If a violin's contribution to a recording is of interest, but if it sounds as if its coming from a seat in the rear of the upper balcony, I'd rather hear it sounding 'big'. Subscribed to a chamber music series, listening from my favored seating location, and then coming home to listen to recordings of the same composition(s), my Tympanis made the violin sound too small.
  

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  • RE: "diffuse imaging"?? ... - Satie 12:04:34 05/09/15 (3)
    In Reply to: RE: "diffuse imaging"?? ... posted by Norman M on May 08, 2015 at 08:27:57

    I am going to guess that the small violin image is related to your amplification.
    
    I ran my fosgate amps in differential bridged mode (in which case they are acting like balanced amps) which resulted in all the images becoming smaller by quite a factor of 2 if not more. The soundstage also shrank and instruments no longer imaged outside the mid/tweeter panels. Went back to SE mode. Though not as spacious as my tube amp it was sufficiently satisfying.
    
    If you go back to the utube vid of the 1065 with the pianos all placed laterally then I have the outside pianos imaging outside the mid,tweet panels and the inside pianos imaging in the space between the tweeters. As the main L mic was placed farther to the high note wires of the 2nd piano from the left, it images closer to the mid tweeter panel and the 3rd piano (from the left) images as pulled further to the center as the R mic is closer to its high note wires.
    
    How did those image in your setup?
    

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    • RE: "diffuse imaging"?? ... - Norman M 17:51:44 05/10/15 (2)
      In Reply to: RE: "diffuse imaging"?? ... posted by Satie on May 09, 2015 at 12:04:34

      I will eventually get around to listening and using the YT video of that BWV 1065 performance. On YT there are also some laterally placed pianos performing Mozart's Concerto for 3 Pianos, K. 242 (Solti, Barenboim, Schiff). How well all the engineering involved allows these performances to be 'test' material could well be a different story.
      
      Perhaps of some use or interest, in that past I had some success in using the "Stereo Review Stepped Pan Test", and still own its original CD.
      
      Explanation:
      https://www.youtube.com/watch?v=ojVxoxfm9-Q
      A sound sample:
      http://www.amazon.com/The-Stepped-Stereo-Test-Intro/dp/B00A6U9VO0
      
      
      

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      • RE: "diffuse imaging"?? ... - Satie 22:58:33 05/10/15 (1)
        In Reply to: RE: "diffuse imaging"?? ... posted by Norman M on May 10, 2015 at 17:51:44

        The main thing is that there is a visual record of the orchestra and soloists' placements and a known location for the mics as a reference so you can tell whether you are getting bending of the soundstage or foreshortening and also see whether it is related to the mic locations. The quality of live performance recordings is highly variable but has one serious positive: that it is not an artificial construct of the mixing console from fake panned instruments with their individual mics and tracks.
        

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        • RE: "diffuse imaging"?? ... - Norman M 09:15:23 05/11/15 (0)
          In Reply to: RE: "diffuse imaging"?? ... posted by Satie on May 10, 2015 at 22:58:33

          I played the BWV 1065 link using an iPad, listening to the audio from its mini jack into my Tympani IV-As. Although the sound wasn't 'fabulous', it sufficed and played properly from L to R (and following its video). At times sound from the center two pianos was hard to place precisely.
          
          The sound from the Stepped Stereo Pan Test is said to be a "constant power pan which mimics the positioning generated by a studio console equipped with a precision sine/cosine pan pot ... and the level of the tones should remain constant", which is unlike four different pianos playing different parts of a concerto, which must of necessity be played at differing levels.
          

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