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James Walker
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To Ray's comments, I would add that each resonator is tuned to correspond to the bar above it - hence the larger resonators beneath the lower-pitched bars.
As to the length of resonators on the upper end of the instrument, the practice of using longer tubes for those resonators is purely aesthetical, giving a visual symmetry to the instrument when viewed from the audience; you'll notice that the resonators for the lower manual never go for this symmetrical design.
Look at the stops inside these sorts of resonators in the higher range of your instrument, and you'll see that the actual air column between the stop and the top of the resonator is smaller; the extended portion of the tube is purely there for visual purposes. Of course, that means that each set of resonators is that much heavier, each set requires more raw materials for construction, and also takes up that much more space when the instrument is broken down for storage and/or transport. That's why some manufacturers keep the actual length of resonators short on the high end of the instrument, and why some manufacturers don't have a full row of resonators beneath the upper manual, instead only setting resonators under the bars.
JW
http://www.malletjazz.com
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