Why filtering can increase amplitude
#909744 - 21/04/11 11:36 AM
Hi! I understand the basics - that if a frequency wave is phased such that it's dips
counteract a lower frequency wave's peaks, then a LPF will incrase the peaks of the
overall sound. Does anyone know of any articles - or maybe books - on the details of this
concept, and how it should affect your work in the studio?
Loc: The Wrong Precinct
Re: Why filtering can increase amplitude
[Re: Ignis Fatuus]
#909748 - 21/04/11 11:40 AM
There's a good explanation (with diagram) of this phenomenon in Bob Katz's Mastering
Audio. It's only a small section of the book, but it's a fantastic book nonetheless so
I'll recommend it anyway!
As far as "how it should affect your work in the
studio"... Two words: Leave headroom!
That's pretty much all you need to know;
that filtering eliminates some frequency components, but that it can simultaneously raise
So if you're high-pass filtering a track, don't have your levels
too near 0dBFS beforehand. Similarly, if you're encoding something to MP3, leave headroom
— the encoding process involves lots of filtering, and that can lead to the output file