# Mastering Before/After Report

Compare a source mix against its master: integrated LUFS, true peak, LRA, DR dynamic range, crest, spectral balance and waveform strips, with every delta spelled out.

> Canonical page: https://elysiatools.com/en/tools/audio-mastering-before-after-report

- **Category:** Media

- **Keywords:** mastering report, before after, lufs comparison, true peak, dynamic range, dr meter, lra, plr, loudness difference, waveform comparison, mastering qa

## Overview

Feed in the pre-master and the finished master and get an honest engineering diff, not a vibe. Loudness comes from the EBU R128 measurement chain (integrated LUFS, true peak in dBTP, loudness range), plus the peak-to-loudness ratio (PLR = true peak − integrated) that streaming codecs care about. Dynamics use a TT DR-style offline metric: 3-second blocks, the SECOND-highest block RMS against the overall sample peak, so one accidental transient cannot fake a wide-range reading — the same anti-outlier trick the original DR meter used. A spectral centroid and low/mid/high energy shares expose brightness and tonal shifts, and two waveform strips show level and clipping shape at a glance. The report leads with the actual gain change (master LUFS minus source LUFS) and flags the deltas that matter: true-peak headroom lost, LRA squeezed, DR crushed. Only the same-length version pair makes a strictly fair comparison; length mismatch is flagged, not rejected. Measurement files stay untouched — this tool only reads.

## Inputs

- **Original audio** (file)
- **Processed audio** (file)

## When to use

- Use it when you need to process audio files content quickly in the browser.
- Helpful for media workflows that need repeatable inputs and fast results.
- A good fit when you want to test with real files before running the same workflow in code or API calls.

## How it works

- Provide Original audio, Processed audio as input to the tool.
- The tool processes the request and returns a html result.
- For file workflows, start with representative samples such as audio files test files to verify edge cases and output quality.

## Use cases

- Process audio files data during debugging or QA.
- Validate expected output before using the API or automation flows.
- Test the workflow with representative sample files and edge cases.

## Frequently asked questions

### What does Mastering Before/After Report do?

Mastering Before/After Report helps you process audio files content online without setting up a separate local script or app.

### When should I use this tool?

Use it when you need a quick process workflow, want to verify output, or need a browser-based utility for media tasks.

### Can I try this tool with sample data?

Yes. This page can recommend related sample files so you can test the workflow immediately.

### What inputs does Mastering Before/After Report accept?

Mastering Before/After Report accepts Original audio, Processed audio and supports file uploads for 2 fields.

### Is there an API for Mastering Before/After Report?

Yes. The tool page includes an API endpoint so you can move from manual testing to scripted usage.

## Related tools

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- [Batch Audio Converter](https://elysiatools.com/en/tools/audio-batch-converter): Convert multiple audio files between different formats like MP3, WAV, FLAC, AAC, OGG, Opus with quality settings and batch processing

## Samples

- [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
- [Speech Learning & Safety Audio Samples](https://elysiatools.com/en/samples/audio-learning-safety-samples): Deterministic synthetic WAV inputs for pronunciation comparison, dictation preflight, alert degradation, and voice privacy tools.