# What does “ripple limit cutoff” mean?

So I'm reading the datasheet for MAX98357A.
It's an audio amplifier that receives digital signal using I²S bus and has integrated digital low-pass filters of the IIR and FIR types.

In addition to the usual -3 dB and -6.02 dB cut-off points, it also has the "Ripple limit cutoff". This is a term I did not see during my education, and I'm not sure exactly what it means.

Here's an example of the specification:

Ripple limit cutoff 0.43 x Fs
-3dB cutoff         0.47 x Fs
-6db cutoff         0.5  x Fs
Stopband cutoff     0.58 x Fs