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10F/8424 & RS225-8 FAST Ref Monitor
10F/8424 & RS225-8 FAST Ref Monitor
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Old 16th June 2018, 04:29 PM   #1161
xrk971 is online now xrk971  United States
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10F/8424 & RS225-8 FAST Ref Monitor
Generally, even-sided objects have inversion symmetry. Meaning you could put a mirror along the inversion symmetry plane and be able to reproduce the object. So squares, rectangles, hexagons, (and even circles technically) have inversion symmetry. Odd-sided objects like triangles and pentagons cannot be mirrored. So this means that there is not a flat-to-flat parallel wall for a resonance to set itself up. Circular or rotational symmetry is better than flat-flat but a circle in itself has resonance mode (breathing mode - radial direction and tangential parallel to round wall in a loop or so called whispering gallery mode). For odd numbered walls you don't want to go to high as then it approximates a smooth circle. This concept also applies to drumheads or membranes. The Vifa TC9FD and cousins (TG9, 10F, etc) have a patented pentagonal membrane (you can see it on underside of cone and where it is glued to surround). This is one way to get rid of traditional drum-head vibration modes on cone. Hence it is very smooth and relatively breakup free.
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