One of the oldest debates in audio engineering is: Subtractive EQ (Cutting) vs. Additive EQ (Boosting).
- Subtractive EQ: Identifying frequencies you don't like and turning them down.
- Additive EQ: Identifying frequencies you like and turning them up.
Is one better than the other?
The Case for Cutting (Subtractive)
Many pros advocate for "cutting first." The logic is simple: Headroom.
When you boost a frequency, you are adding gain (volume) to the track. If you keep boosting things, you eventually run out of headroom and clip the channel.
When you cut, you are removing gain. You are cleaning up the signal. By removing the "mud" (bad frequencies), the "good" frequencies naturally sound clearer and louder by comparison.
- Pro Tip: Use Narrow Q (bandwidth) when cutting. This allows you to surgically remove a bad resonance without hollowing out the sound.
The Case for Boosting (Additive)
Sometimes, cutting isn't enough. If a kick drum doesn't have enough "thump," cutting the highs won't magically create bass. You have to boost the bass.
Boosting is great for character and color. Analog EQs (and their plugin emulations) often add pleasing harmonic saturation when you boost.
- Pro Tip: Use Wide Q (broad bandwidth) when boosting. Broad boosts sound more musical and natural to the human ear. Narrow boosts sound artificial and resonant.
The Golden Rule: Cut Narrow, Boost Wide
This is a great starting strategy for beginners:
- Listen for problems. Is there a ringing? Is there mud? Use a narrow cut to fix it.
- Listen for enhancements. Does it need more air? More thump? Use a wide boost to sweeten it.
Don't be dogmatic. You will use both on every mix. But if you find yourself boosting 5 different bands on one track, ask yourself: "Should I just turn the volume fader up?" or "Should I cut the other frequencies instead?"