Apps & Tools

Compression Ratio Explainer

Set threshold and ratio to see how a compressor shapes your signal and visualise gain reduction at every input level.

Presets

Controls

Threshold — -18 dBFS

-18 dBFS

Ratio

Attack

Release

Transfer Curve

Input Level	Output Level	Gain Reduction	Above Threshold

Knowledge Base

How to Use the Compression Ratio Tool

The Compression Ratio Explainer visualizes how compression changes audio dynamics. Enter a compression ratio (4:1, 2:1, etc.), threshold, and sample audio level to see the output level. Critical for understanding compression in mixing and podcast production.

What Is Compression?

Compression reduces the volume of loud parts while leaving quiet parts untouched. A 4:1 ratio means for every 4 dB above the threshold, the output rises only 1 dB. This "glues" a mix together and prevents clipping.

Understanding Ratios

2:1 (Gentle): Subtle, musical. For vocals and instruments that need shape without obvious squashing.
4:1 (Moderate): Noticeable but natural. Standard for vocal mixing and drums.
8:1+ (Heavy): Obvious, pumping, electronic feel. For parallel compression or creative effects.
∞:1 (Limiting): Hard ceiling. Output never exceeds the threshold. Protects against clipping.

Compression Settings in Context

Threshold: The dB level where compression starts. Lower threshold = more audio affected.
Attack: How fast compression reacts (fast catches peaks, slow lets transients through).
Release: How fast compression stops after audio drops below threshold.

FAQ

Q: How much compression should I use?
A: 3-6 dB of gain reduction sounds natural. 10+ dB is noticeable and creative. Avoid over-compressing individual tracks.

Q: What's the difference between compression and limiting?
A: Limiting is extreme compression (∞:1) that acts as a safety ceiling. Compression is musical and gradual.

Q: Should I compress before or after EQ?
A: Compress first to control dynamics, then EQ to shape tone. Some engineers reverse this.