irregularities in horn resonance

Discussion in 'Trumpet Discussion' started by coolerdave, Aug 9, 2011.

  1. coolerdave

    coolerdave Utimate User

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    As I was playing my warmup and slowly moving up a diatonic C scale I have noticed that some notes seem to ring full and other just a little bit less. It is something that would go unnoticed in a piece and is probably more perceptable by the player. Let's assume the horn is clean and free from any defects and is a solid instrument. I am playing a Bach 37 made somewhere in the mid seventies which is also a Bob Malone conversion.
    So what is this all about .. are trumpets just naturally this way. Did the conversion up the resonance of the majority of the horn which actualy makes the balance spread more noticable. Is this why people pay $6,000 for a Monette ... just wondering. Like I said it's subtile ...
    When I play I try to get every note played to pull every last overtone I can out of my horn.
    comments thoughts .... except the ones bagging on Bach
     
  2. bumblebee

    bumblebee Fortissimo User

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    Sounds like an interesting thing to test - particularly trying to ensure that each note is being played consistently... I only have one horn with me this week (the Destino III) but when I return to the ranch I might give them all a go as you describe.

    If you have an engineering/signal processing bent, and a signal analyser, it might be worth recording the traces for each note and seeing which side frequencies are suppressed or accentuated -- maybe there will be a pattern which matches your subjective opinion for each note?

    --bumblebee
     
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  3. stumac

    stumac Fortissimo User

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    What valve combinations does this occur? I find third valve the worst on its own or in combination.

    I have downloaded a free Spectrum Analyzer program called Visual Analyzer 8,
    even with the built in microphone in the laptop shows harmonic content with different setups.

    Regards, Stuart.
     
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  4. coolerdave

    coolerdave Utimate User

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    I will check out that program ... I am not so sure it's always a particular valve combination .... if it were I think I would look at my valve alignement .. even though it's more subtle than those kinds of issues. It's definitely a change in the harmonic overtone structure. I just had a random thought.. I wonder if the room I am playing in has something to do with it ... I need to check this out in other areas of my house.
     
  5. stumac

    stumac Fortissimo User

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    Could very well be the acoustics of the room. try playing in different places and facing different directions, if you are generating standing waves, different positions will have different responses.

    Regards, Stuart.
     
  6. coolerdave

    coolerdave Utimate User

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    If I understand it right.. a standing wave would enhance some frequencies and also dampen others..right?
    also
    A dead room would really expose less resonant notes on the horn... because a "live" room could pick up the less resonant notes and help mask it ... I think
     
    Last edited: Aug 9, 2011
  7. bumblebee

    bumblebee Fortissimo User

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    So play sitting down.



    --bumblebee
     
  8. coolerdave

    coolerdave Utimate User

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    I don't know that one ..could you hum a few bars.... ba dumpt chink
     
  9. rowuk

    rowuk Moderator Staff Member

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    Trumpets are generally not even in their resonant behaviour.

    When we look how a trumpet functions (standing wave in a tube with leakage out of the bell) we realize that the tube has one set of "preferences" and the bell other. In most cases, the trumpet is built for sound first, blow second, intonation third and the rest after that.

    Yes, people buy particular horns when a more even resonance without loss of intonation is desired - not just Monette though. Schilke and Yamaha Xenos are also superior in that respect.

    Others bore the throat of the mouthpiece out which decreases the efficiency and makes the blow more even at the expense of output and intonation accuracy.
     
  10. coolerdave

    coolerdave Utimate User

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    Does a dead room expose these inconsistencies more Robin?
     

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