| I think I know why Rob does this, although as he frequents this board he can answer himself I suppose.
Of course it depends on the slope of your LPF, too steep and it'll ring, too gentle and it'll roll off too much.
Many purely digital songs (entirely produced and mixed ITB) have excessive high freq material all the way up.
There are several ways to fix that but one could be a filter.
I rarely apply a filter like that during mastering though. However, I frequently low cut at somewhere between 20 and 30 Hz. |