Sorry m8,


always use low shelving EQ on everything (ie a high pass filter) , even if its at 20 - 30hz


A shelving filter is a shelving filter... which is very different from a high pass filter (that eliminates everything Below/ above the freq. point, i.e. Cut off frequency)... I wouldn't use a High pass m8 .. a simple bell with a big cut will do... Imagine that at the mastering stage they found the sound lacking, they can always bring it back... if u use a HPF there's nothing that anymore!

Z