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Loud "C" notes

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  • Loud "C" notes


    Well folks, I may have encountered my first small issue with my ADC 5300. When soloing Trumpet, or Clarion, or other horn type sound on my swell, As I run up the octave scale, the C notes are loudest then the D notes drop noticeably off in volume and then start increasing in volume as I continue to run up the scale to the next C which again is the loudest. Is there a adjustment for this? Or is it a inherit flaw/design?

  • #2
    Could that be an acoustic resonance? Is it not the same with the real horns? A try on a headset will give an answer to my loud thinking...

    Cheers,
    Boyan

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    • #3
      Could be a speaker resonance or a room resonance effect of some kind. It's virtually impossible for the actual output level coming from the TG board to vary from note to note on an organ like that, as all the notes use the same stored sample processed through the same circuits and DAC. Of course, a faulty TG board might have developed an on-board resonance of some kind, if some capacitor somewhere has gone bad and is accentuating certain frequencies in some way. Sounds pretty far-fetched though.

      I'd experiment with speaker angles. When I first installed the big MDS at my church, I found that a small number of notes in the fourth octave seemed to be noticeably louder than other notes. These notes would stick out (at least to me) so much that I'd avoid playing them on hymns, or cringe if I forgot and used one of them.

      After I played around with speaker placement, angling the HC-15's so the tweeter output had to bounce off the ceiling, the effect went away.
      John
      ----------
      *** Please post your questions about technical service or repair matters ON THE FORUM. Do not send your questions to me or another member by private message. Information shared is for the benefit of the entire organ community, but other folks will not be helped by information we exchange in private messages!

      https://www.facebook.com/pages/Birds...97551893588434

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      • #4
        OK so I have lifted all six channels of audio off the main organ which is done through Hlabs mixer with input bypasses. The mixed down audio (for the reverb) is then routed to the reverb and from there to a commercial amp WHERE there is a optional headphone jack. Though the nuanse is actually coming through the main audio I can clearly detect it in the head phones. Its every octave starting with the "C"'s then D's are noticeably softer and the the scale gets louder with each note as I climb up to the next octave C which peaks in volume then the D note after falls off moticeably

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        • #5
          It would help diagnose the problem if you would list every voice that has this issue.

          td
          Servicing electronic organs since 1969.

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          • #6
            Yep. If it's just the swell reeds doing this, it might be the TG board which produces the offending stops. Check the stops one at a time to determine which ones are doing this, then we might look at the cage chart and see which board is at fault.
            John
            ----------
            *** Please post your questions about technical service or repair matters ON THE FORUM. Do not send your questions to me or another member by private message. Information shared is for the benefit of the entire organ community, but other folks will not be helped by information we exchange in private messages!

            https://www.facebook.com/pages/Birds...97551893588434

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