# Audio Parallel Compression (New York Style)

Blend the dry signal with a heavily compressed, makeup-gained copy — upward compression that lifts quiet detail while the dry path keeps its punch, built from FFmpeg.

> Canonical page: https://elysiatools.com/en/tools/audio-parallel-compression

- **Category:** Media

- **Keywords:** parallel compression, new york compression, upward compression, dry wet blend, acompressor, punch, glue compression, drum bus, mixing, dynamic control

## Overview

Classic parallel ("New York") compression done the correct way: the dry signal stays at unity while an aggressive acompressor copy (threshold −25/−35/−45 dB, ratio 3/6/12, makeup +7/+13/+20 dB tuned so the wet path sits near unity at program level) is blended in at a wet mix percentage. The sum behaves as upward compression: quiet passages rise toward the loud ones while transients from the dry path survive — crest factor stays essentially unchanged while the quietest window of the file gains several dB. FFmpeg details verified on the installed build: acompressor threshold and makeup are linear amplitudes (not dB), attack/release are milliseconds, and detection=rms with link=average tracks the program envelope like a classic bus compressor; amix uses normalize=0 so the two paths add at true unity, with a limiter guarding the summed output. The tool measures the file in 8 equal windows before and after the render and reports the quiet-window lift, the loud-window lift, their difference (the upward advantage) and the crest factors, so you can see the effect instead of guessing by ear.

## Inputs

- **Audio file** (file)
- **Intensity** (select)
- **Wet mix (%)** (number)
- **Attack (ms)** (number)
- **Release (ms)** (number)
- **Output format** (select)

## When to use

- Lifting quiet background nuances, room acoustics, or vocal breath without flattening the main dynamic peaks.
- Adding punch, sustain, and glue to drum busses, percussion stems, or instrument groups.
- Increasing average perceived loudness across dynamic tracks while keeping the original transient crest factor intact.

## How it works

- The input audio splits into two paths: an untouched dry path and a heavily compressed wet path processed via FFmpeg's acompressor.
- The wet path applies aggressive dynamic reduction and tuned makeup gain based on your selected intensity (Gentle, Medium, or Aggressive) and attack/release timing.
- Both paths blend according to your specified wet mix percentage using non-normalizing summing, protected by an output limiter.
- Dynamic lift across 8 temporal windows and crest factor measurements are calculated and reported alongside the rendered audio file.

## Use cases

- Drum bus processing to inject sustain and room resonance behind sharp snare and kick hits.
- Vocal track leveling to bring forward whispery verses and tail-end phrases without over-compressing loud chorus lines.
- Full mix master buss glue to increase perceived acoustic energy and presence while safeguarding punch.

## Frequently asked questions

### What does parallel (New York style) compression do?

It blends an uncompressed dry signal with a heavily compressed copy, raising subtle, quiet sounds while preserving the sharp transient attacks of the original track.

### How does parallel compression differ from downward compression?

Standard downward compression pulls down the loudest peaks, whereas parallel compression functions as upward compression by lifting quiet sections up toward the peak level.

### What intensity setting should I choose?

Select Gentle for subtle bus glue, Medium for classic New York mix thickening, or Aggressive for heavy drum smash and maximum low-level lift.

### Will applying parallel compression cause output clipping?

No. The summing stage is protected by a peak limiter to ensure that adding the wet and dry signals together does not produce digital clipping.

### Which audio formats can I export?

You can export the processed file in MP3, WAV, FLAC, M4A, or OGG Vorbis formats.

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## Samples

- [Copyright-Free FLAC Audio Samples](https://elysiatools.com/en/samples/flac-samples): Lossless FLAC audio samples for testing and development, mirrored from MP3 set with nature sounds and meditation music
- [Copyright-Free MP3 Audio Samples](https://elysiatools.com/en/samples/mp3-samples): Collection of royalty-free audio samples for testing and development purposes including nature sounds, meditation music, and ambient audio
- [Copyright-Free WAV Audio Samples](https://elysiatools.com/en/samples/wav-samples): Uncompressed PCM WAV audio samples for testing and development, mirrored from MP3 set with nature sounds and meditation music
- [Copyright-Free Raw PCM Audio Samples](https://elysiatools.com/en/samples/pcm-samples): Raw PCM s16le audio samples featuring nature ambience and relaxing music for waveform, playback, and conversion workflows