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In the absence of bracing, the off-axis response does not show uniform attenuation, as illustrated in the graph above.
On the other hand, when bracing is present, these issues disappear, as shown in the graph below.
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The frequency range where problems occur is also visible in the contour plot, as seen below.
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When bracing is present, these issues do not appear in the specified range.
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Also, this can be easily observed in the polar plot.
Without bracing, a dip occurs at 553Hz, showing attenuation of sound on-axis, with strong sound occurring on the sides where resonance happens.
Similarly, at 465Hz, where a peak is observed, the opposite issue is evident.
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When bracing is present, the graph for 465Hz and 553Hz shows a stable response, as seen below.
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