Filter characteristics

Notch filter for 50-Hz-rejection
-3 dB points at 41 and 59 Hz

Low-pass filter (EEG)
-3 dB point at 49 Hz

Band-pass filter (EMG)
-3 dB points at 16 and 54 Hz

The above two are also anti-aliasing filters for the sampling rate reduction from 512 Hz to 128 Hz.

The following filters are unconditional, i.e., they can not be switched off:

Amplifier time-constant:
1 second, which is a high-pass filter with a -3 dB point at 0.16 Hz

Hardware anti-aliasing filter
Low-pass with -3 dB point at 102 Hz (in the 512-samples-per-second domain)