More Examples:
3. Soundboards of instruments avoid resonances
4. loudspeaker: flexible cardboard speaker cone supported
on springy rim.
It is supposed to respond almost uniformly over a wide
frequency range
Thus: wide resonance curve and short damping time
Thus: large friction -> inefficient (100W amp for few Wsound)
tweeter + midrange + woofer to even out freq. response.
5. tone dialing: resonance circuits at phone center
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