Loudspeaker
Radiation is frequency dependent
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Below also shows cone break-up shape at different frequency in 3D form.
Due to cone break-up, where by the break-up is dependent on frequency over dimension, weight and shape, therefore the sound output radiation is un-predictable and random. This makes the speakers completely non user-friendly (engineer friendly) as we do not know where it shoots more sound (louder) and unknown what kind of sound (frequency) ???.
All speakers behaves like this :(
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