Audio Compression vs Limiting: When to Use Each

Compression and Limiting Defined

Both compression and limiting reduce dynamic range — the difference between the loudest and quietest parts of audio. A compressor applies gradual gain reduction above a threshold with adjustable ratio (typically 2:1 to 8:1). A limiter is essentially a compressor with an extreme ratio (10:1 or higher), creating a hard ceiling.

When to Use Compression

Compression is ideal for evening out vocal performances where volume varies naturally. A podcast host who speaks softly then laughs loudly benefits from 3:1 compression. Music mixing uses compression to add sustain to instruments, glue mix elements together, and control transients. Moderate compression (2-4 dB gain reduction) is usually transparent.

When to Use Limiting

Limiting serves as a safety net — preventing audio from exceeding a maximum level. During mastering, a limiter raises overall loudness while preventing clipping. For broadcast and streaming, limiters ensure compliance with loudness standards (LUFS targets). Live sound uses limiters to protect speakers from damage.

Common Mistakes

Over-compressing removes all dynamic expression, creating lifeless, fatiguing audio. Setting attack times too fast on a limiter destroys transients, making audio sound pumpy. Stacking multiple compressors without understanding gain staging leads to noise amplification. Not using makeup gain after compression results in quieter overall levels.

Practical Setup Guide

For podcast vocals, start with a compressor at 3:1 ratio, -18 dB threshold, 10ms attack, 100ms release. Follow with a limiter set at -1 dB ceiling. Adjust the compressor threshold until you see 3-6 dB of gain reduction on average. Monitor your output level — target -16 LUFS for podcasts, -14 LUFS for music streaming.