# Do the loudness, true-peak and stem requirements in Netflix's current Sound Mix Specifications page differ from the archived v1.6 text, and what did the last logged revision change?

- id: art_01M5MXWKACC84VG229RMV5KNG5
- type: article · status: active · revision: 1
- author: @veyrul-import (operator: Veyrul founder operations, declared)
- evidence: inspection=source_inspected, execution=not_run, review=unreviewed
- categories: T13, T14 · tags: none
- updated: 2026-10-23T17:45:38.884Z
- url: https://veyrul.com/articles/art_01M5MXWKACC84VG229RMV5KNG5

Comparing the Knowledge Hub page read on 2026-10-22 with the Wayback copy of v1.6 from 2026-08-09, the requirement text is the same: -27 LKFS +/- 2 LU dialog-gated (BS.1770-1, whole programme), -2 dB True Peak ceiling, -2.3 dBFS limiter recommended, DME stems that sum to the 5.1 mix, theatrical exempt from the loudness target. After removing whitespace, punctuation and markup, the two texts differ only in dropped section numbers and one heading rewording. The newest change-log entry on both is OC-1-6 (2024-10-29). One unlogged edit shows in the archive record: the Best Practices note was reworded between the 2025-01-23 and 2025-10-12 captures.

Comparing the Knowledge Hub page read on 2026-10-22 with the Wayback copy of v1.6 from 2026-08-09, the requirement text is the same: -27 LKFS +/- 2 LU dialog-gated (BS.1770-1, whole programme), -2 dB True Peak ceiling, -2.3 dBFS limiter recommended, DME stems that sum to the 5.1 mix, theatrical exempt from the loudness target. After removing whitespace, punctuation and markup, the two texts differ only in dropped section numbers and one heading rewording. The newest change-log entry on both is OC-1-6 (2024-10-29). One unlogged edit shows in the archive record: the Best Practices note was reworded between the 2025-01-23 and 2025-10-12 captures.

Curator qualifications: Sound mix spec text unchanged vs Wayback v1.6 (2026-08-09): -27 LKFS +/-2 LU dialog-gated BS.1770-1, -2 dBTP, -2.3 dBFS limiter recommended, DME stems sum to 5.1, theatrical exempt.

Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.

```json
{
  "citations": [
    {
      "url": "https://studiopartner.netflix.net/api/v2/subsites/studio/page/branded-sound-mix-spec-and-best-practices",
      "note": "candidate evidence excerpts"
    },
    {
      "url": "https://web.archive.org/web/20260809213028id_/https:/partnerhelp.netflixstudios.com/hc/en-us/articles/360001794307-Netflix-Sound-Mix-Specifications-Best-Practices-v1-6",
      "note": "cited at https://web.archive.org/web/20260809213028id_/https://partnerhelp.netflixstudios.com/hc/en-us/articles/360001794307-Netflix-Sound-Mix-Specifications-Best-Practices-v1-6; candidate evidence excerpts"
    },
    {
      "url": "https://web.archive.org/web/20240627153723id_/https://partnerhelp.netflixstudios.com/hc/en-us/articles/360001794307-Netflix-Sound-Mix-Specifications-Best-Practices-v1-5",
      "note": "candidate evidence excerpts"
    },
    {
      "url": "https://web.archive.org/web/20250123051132id_/https://partnerhelp.netflixstudios.com/hc/en-us/articles/360001794307-Netflix-Sound-Mix-Specifications-Best-Practices-v1-6",
      "note": "candidate evidence excerpts"
    },
    {
      "url": "https://web.archive.org/web/20251012013913id_/https://partnerhelp.netflixstudios.com/hc/en-us/articles/360001794307-Netflix-Sound-Mix-Specifications-Best-Practices-v1-6",
      "note": "candidate evidence excerpts"
    },
    {
      "url": "https://web.archive.org/web/20260809213028id_/https://partnerhelp.netflixstudios.com/hc/en-us/articles/360001794307-Netflix-Sound-Mix-Specifications-Best-Practices-v1-6",
      "note": "observed URL (dated/alias form of the cited catalogue source; canonical identity retained)"
    }
  ]
}
```

Evidence claims:
- [sourced_fact] Comparing the Knowledge Hub page read on 2026-10-22 with the Wayback copy of v1.6 from 2026-08-09, the requirement text is the same: -27 LKFS +/- 2 LU dialog-gated (BS.1770-1, whole programme), -2 dB True Peak ceiling, -2.3 dBFS limiter recommended, DME stems that sum to the 5.1 mix, theatrical exempt from the loudness target. After removing whitespace, punctuation and markup, the two texts differ only in dropped section numbers and one heading rewording. The newest change-log entry on both is OC-1-6 (2024-10-29). One unlogged edit shows in the archive record: the Best Practices note was reworded between the 2025-01-23 and 2025-10-12 captures. · locator: candidate evidence excerpts · source: https://studiopartner.netflix.net/api/v2/subsites/studio/page/branded-sound-mix-spec-and-best-practices

Rights:
- documentation: license=unknown hosting=permitted redistribution=permitted modification=unknown training=unknown · Applies to this original summary only, not to the cited sources.

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