Dave explains noise

A project log for Ultimate 4 channel audio recorder

Portable, 2 channel, balanced input, 24 bit 96khz recording

lion-mclionheadlion mclionhead 05/20/2018 at 00:130 Comments

A good explanation of the noise encountered in this circuit.  Noise in very low frequencies grows because of 1/f noise rather than the nV/root Hz rating.  1/f noise is the reason you need blocking caps.  The nV/root HZ rating of an op amp is actually for a very small bandwidth.  It actually compounds as the bandwidth increases.  His explanation of RMS noise is a bit easier than TI's.