background noise in circuit in absence of audio

Alec_t

Joined Sep 17, 2013
14,280
Oops. My bad. The sim for the '6138 LPF was in error, so ignore the above LPF comparisons.
Both LPFs have similarly shaped frequency responses in my revised sim and are substantially flat over the whole audio spectrum, with a -3dB point at 25kHz and a -8dB point at 48kHz.
 
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