Input filter on differential amplifier input
It is still a function of impedance ratios but a passive LPF loaded by an active filter raises the breakpoint and also attenuates to 1/4 or -12dB at DC with these 4:1 R ratios.

-3dB BW 242 mHz, ...  469mHz  without C1

DC gain -12 dB   ........ same
2 Hz -40dB ............  -24 dB
2kHz -80dB  ............ -44 dB
-40 dB/dec  ............  -20dB/dec   

What do you really want? 2nd order filter with 0dB DC gain at 0.33 Hz?