Can someone explain to me why in some spectrum analyzers, it shows frequency ranges peaking at different db levels. For example the 50hz range of a dubstep song i'm analyzing appears to be peaking at -4db to -5db from foobar which is my media player, but on the likes of span, it appears to be peaking at around -28db, the same goes for the higher frequencies, its showing that the higher frequencies are louder than the low end compared to foobar. Is it because there are different ways of measuring a spectrum? Thanks.