Answer Posted / padiyar

The theory is that 3dB differences are "just perceptible,"
so a speaker whose response curve lies within that tolerance
window is a reasonably accurate speaker.

or

As a rough rule of thumb, a change of 3 dB at mid
frequencies is just noticeable by the average person.

or
mathematically to say
It is the half power point. At this point, the
electronic/communication system has achieved the maximum
power transfer.

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