Parallel compression explained

Parallel compression is when you send a signal to a duplicate bus, crush it heavily (ratio 10:1, threshold −24dB, fast attack, fast release), then blend it underneath the original.

Updated 2026-05-03

Short answer

Parallel compression is when you send a signal to a duplicate bus, crush it heavily (ratio 10:1, threshold −24dB, fast attack, fast release), then blend it underneath the original. You keep the dry transients and add the compressed body, fatness without losing punch.

Send signal to a parallel bus (aux/group)
Threshold: −24 dB, pull a lot of gain reduction (10–15 dB)
Ratio: 10:1, aggressive crush
Attack: 1 ms, Release: 50 ms, clamp everything fast, recover fast
Blend: start at −15 dB under the dry signal, taste up

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Set up the parallel bus

Create a new aux/group bus and send the source (drum bus, vocal, snare, whatever) to it post-fader. Don't replace the original, the parallel bus is added underneath. Some DAWs have a 'duplicate' shortcut that creates this routing automatically.

Crush the parallel bus

On the parallel bus, insert a compressor with aggressive settings: ratio 10:1, threshold low enough for 10–15dB of gain reduction, attack 1ms, release 50ms. The signal should sound smashed and unusable on its own, that's correct. The dry signal will provide the punch.

Blend under the dry

Bring the parallel bus fader up from −∞ until you hear it adding body and sustain to the dry signal. Start around −15dB below the dry. Too loud and you lose the dry transients; too quiet and the parallel bus does nothing. The parallel bus should be felt more than heard.

EQ the parallel bus separately

The parallel bus often benefits from its own EQ, high-pass at 100Hz to remove rumble, cut a few dB at 2–4kHz to remove harshness from the heavy compression. Don't worry about matching the dry signal's EQ; the parallel bus has a different job.

Frequently asked

What is parallel compression?

A technique where you send a signal to a duplicate bus, compress it heavily, and blend it under the original. The dry signal keeps the transients; the parallel bus adds the compressed body and sustain. Common on drum buses, snare, vocals, and full mixes.

What settings for parallel compression?

Aggressive: ratio 10:1, threshold low enough for 10–15dB of gain reduction, attack 1ms, release 50ms. The point is to crush the parallel bus completely. Subtle settings on a parallel bus are usually a sign you should compress on the main channel instead.

Where is parallel compression used most?

Drum bus (New York compression), snare (for sustain and body), lead vocals (for thickness), and the master bus (for energy). It's rare on bass and kick, those usually get heavy compression on the main channel instead.

Should I use parallel compression on every channel?

No. Use it when you want body and sustain that the dry signal can't provide. If the dry signal already has the right energy with light compression, parallel adds nothing. Reserve it for sources where you specifically want the 'fat under the punch' effect.

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