Compression Settings

Compression limits dynamic range — the gap between loud and soft. You hear tons of it on Spotify and the radio (everything arrives at an even level); a live symphony, by contrast, has zero compression — whisper-quiet one moment, huge the next. Compression squashes those peaks and valleys so a source stays in a controllable, consistent zone.

Classic example: a lead vocalist who’s quiet one moment and belting the next. Compression handles those extremes for you. Brian uses it on a good 80–90% of sources.

The controls

• Threshold — the level (in dB) at which compression kicks in. Below it, nothing happens; above it, the compressor acts.
• Ratio — how hard it pushes back once over the threshold. At 4:1 it takes 4 dB of input to get 1 dB of output past the threshold. Higher = more aggressive; gentle is ~2:1.
• Attack — how fast it clamps down. Instant usually sounds unnatural and clipped, so back it off. ~10–20 ms lets it breathe and sound natural.
• Release — how fast it lets go. Faster release for transient sources (kick, snare); slower/longer for smooth, melodic things (bass, vocals) to sound smoother.
• Output (makeup) gain — compression lowers overall level, so add gain back to match. Push back ~6 dB → add ~6 dB.
• Knee — hard kicks in abruptly at the threshold; soft eases in more gently. (More advanced — leave on auto if unsure. No shame in the auto release button either.)

Watch the GR (gain reduction) meter to see how much it’s pushing back.

Go-to starting point

If a friend called and didn’t know where to start:

• Ratio: about 3:1 to 4:1 on most things.
• Threshold: set so it’s pushing back about −6 dB on the louder parts (a bit more on peaks is fine).
• Attack: ~15–20 ms; Release: faster for drums, slower for vocals/bass.
• Add output gain back to match the bypassed level.

Don’t overdo the built-in compressor

This course uses each console’s built-in compressor on purpose — they’re good, not great. Used moderately they sound fine; crushed really hard they don’t respond as nicely as a premium unit. Be judicious.

The whole goal: invisible compression. You, the engineer, know it’s working; the average listener should never hear it. The more extreme you go, the more it starts to sound compressed — and the less natural it gets.

Hear it on different sources

• Bass — moderate compression smooths the tone and helps it sit. Extreme settings get audibly “plunky” — sometimes good, usually too much.
• Kick — a great way to hear attack: a super-fast attack clips off the punch and sounds terrible; backing it off to ~15 ms instantly sounds natural. Quicker release keeps it punchy and consistent.
• Vocals — where compression matters most. Many consoles include premium modeled compressors (e.g. an LA-2A emulation). These are dead simple — often just one reduction knob, no attack/release to set — and let you compress harder while still sounding natural. If your board has them, use them.

How to actually learn it

Don’t try to find the subtlety of a kick-drum attack control on a Sunday morning with the whole band waiting. Instead, run multitracks through a virtual soundcheck midweek and just play until you hear what sounds good. (If you’re still on an old analog board, a digital console — even a ~$1,500 Behringer X32 — is worth it for exactly this.) Spend half a day on it; hands-on beats any explanation.

Use your ears, not your eyes.

Application

• Set the go-to starting point (4:1, −6 dB GR) on a vocal and a kick, then tweak by ear.
• Midweek, run a virtual soundcheck and deliberately push compression to extremes so you can hear what each knob does.
• Find out whether your console has premium/modeled compressors and put one on your lead vocal.