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All you want to know about BMR technology
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The Technology |
In the case of a modal object, the complete response may be considered as a sum of partial responses, each of which is related to an individual mode of that object. The on-axis pressure of any flat object is a sum of the "pistonic" response and the modal contributions. For the case of a free disc, the mean volume velocity of the non-pistonic modes is zero, so that they will not contribute to the on-axis response. By now applying an "ideal force" to this disc, we can turn it into an "ideal loudspeaker" with a flat on-axis response and an extended, smooth acoustic power response. In the practical case, however, the force delivered always has mass associated with it. This mass at the drive point unbalances the mode shapes and perturbs both the pressure and power responses. However, by adding additional masses at prescribed positions, it is possible to recreate the mode shapes of the free disc and thereby restore the original response.
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