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My question is if the transition band in the question below would be from 4Khz to the Nyquist frequency of 22.05Khz or from 4Khz until 44.1Khz-4Khz=40.1Khz?

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If you don't want DAC noise near 40-44 kHz to alias down into your audio, you want the narrower/lower transition band reconstruction filter.

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  • $\begingroup$ So, upper limit is at 22.05kHz? $\endgroup$ – Dokams May 1 '16 at 12:19
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    $\begingroup$ If the signal bandwidth is $B$, the LPF response should be flat up to $B$, then go to 0 as steeply as feasible. $\endgroup$ – MBaz May 1 '16 at 18:32

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