It is usually defined by the bandwidth between -3dB points.
If we have a frequency response to 10KHz this does not mean that 29KHz is not respoduced. It is just at a lower level. It all depends on how abrupt the slope is.
For example our ear-brain may approach a nearly flat frequency response at 92dB sound pressure level.
This does not mean that at 70dB we do not hear high frequency content. It is just that nature has it that at lower levels our hearing is more sensitive to mid range frequencies. For survival purposes? Baby crying in the desert etc.
Reference:
Fletcher - Munson equal loudness curves
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