>Ok tho.... say you can establish through measurements that the so >called killer octave is most susceptible to this.. how can you tell if its got >anything to do with soundboard impedance with these measurements.. wouldnt you >have to actually check the soundboard for each case ?? By listening to the piano. Listening is what defined the killer octave in the first place, not instrumentation, and that's why I said I probably wouldn't be able to use data that someone else had collected. I would really want to listen to the piano the data came from to try to evaluate the soundboard assembly and take duplex configurations into account. Some of the measurements I plan to take are from pianos exhibiting the loud attack, distortion, and short sustain characteristic of low soundboard impedance. Other measurements will be taken from pianos not manifesting these symptoms. I'll start with a relatively small group of pianos demonstrating the widest divergence in attack/sustain characteristics in the low treble. If I get a correlation between killer octave sound production problems, and unison coupling, I can add more pianos to the sampling over time to see if the correlation still connects. If I don't get a correlation from the limited sampling, I haven't wasted a whole lot of time on nothing. Ron N
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