EQ is one of our closest and oldest friends in mastering. Gentle, broad stroke EQ adjustments can really make a difference to the quality of the end product and can even play a large role in the perception of dynamics and loudness in our tracks. Think of EQ as a mixing desk for frequencies. It’s another opportunity to (re)balance the elements via their frequency content. EQ in mastering is generally very subtle. My goal is to make it sound better (where necessary) without it sounding like it’s been EQ’d.
From the blog Digital Audio Mastering: The Basics
