We'll let happy users of our EQ do that talking. One user said - Using them is like "changing the sound of the mic itself" and less "like using an EQ", that's how natural/unobtrusive they sound and work. Another said - The high end boost is gorgeous, the AIR band does exactly what it says, giving a smooth top end boost without getting harsh. The 12k setting gives much more detail while still sounding smooth. The PEQ-503 is great for cutting some mud from a mix or adding some depth to an instrument. Using this EQ, you can be as subtle or extreme as you dare!