Filter and interstation distance

[sujan1746]

Hi, I am curious about the setting of frequency range in filter and interstation distance.
For the traditional ambient seismic noise analysis (not 'dv/v' but using group velocity and tomography etc), people usually say at least one wavelength (or three wavelength) should be less than interstation distance.
For calculation of dv/v and using msnoise, do we have to consider the wavelength to set filters?
Or the dv/v we get is using scattered wave (avoid direct wave using dynamics or static), so no need to consider the interstation distance and wavelength relationship?