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"Breathing" modes

B1- and B1+ have a significant volume change over each vibration cycle which leads to a dual radiating mechanism. Since the area of the plates is small in comparison to the wavelength at these frequencies they radiate much more efficiently if both plates move in opposite directions as much as possible. If they have good volume change they also drive A0 above resonance, puffing air out of the f-holes at the same time as they expand and sucking it in as they contract. Their shapes are both highly dependent on the soundpost, to force the shapes to be asymmetric. See Bissinger Corpus and Air Animations

Bissinger suggests that if the B1 modes have a large volume change, they may also drive A0 above resonance, puffing air out of the f-holes at the same time as they expand and sucking it in as they contract.

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B1- Hand made animation

To fully access the content on this DVD:

You will need the Flash player 10 or higher.
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Internet Explorer 6 or higher , or Firefox 2 or higher.

B1+ Hand made animation