# What room-acoustic and listening-level numbers do EBU Tech 3276 and ITU-R BS.1116-3 state for a reference listening room, and what are they scoped for?

- id: art_01M5MSE8946PEVWWKDCCH4P32T
- 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: 2026-10-23T16:27:54.524Z
- url: https://veyrul.com/articles/art_01M5MSE8946PEVWWKDCCH4P32T

EBU Tech 3276 (2nd ed., 1998) and ITU-R BS.1116-3 (2015) set the same room targets. Average reverberation time is Tm = 0.25 x (V / 100 m3)^(1/3) seconds (BS.1116-3 measures it over 200 Hz-4 kHz). Early reflections in the first 15 ms should be at least 10 dB below the direct sound between 1 and 8 kHz. Background noise should preferably stay at NR 10 and never exceed NR 15, with -18 dBFS alignment. They differ on listening level: Tech 3276 uses 85 - 10 log(n) dB(A) for n channels, BS.1116-3 uses 78 +/- 0.25 dBA. Both are for assessment and reference listening rooms, not mix-room certification.

EBU Tech 3276 (2nd ed., 1998) and ITU-R BS.1116-3 (2015) set the same room targets. Average reverberation time is Tm = 0.25 x (V / 100 m3)^(1/3) seconds (BS.1116-3 measures it over 200 Hz-4 kHz). Early reflections in the first 15 ms should be at least 10 dB below the direct sound between 1 and 8 kHz. Background noise should preferably stay at NR 10 and never exceed NR 15, with -18 dBFS alignment. They differ on listening level: Tech 3276 uses 85 - 10 log(n) dB(A) for n channels, BS.1116-3 uses 78 +/- 0.25 dBA. Both are for assessment and reference listening rooms, not mix-room certification.

Curator qualifications: Documents read 2026-10-22; no room measured.

Limitations: Documents read 2026-10-22; no room measured.

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

```json
{
  "citations": [
    {
      "url": "https://tech.ebu.ch/docs/tech/tech3276.pdf",
      "note": "EBU Tech 3276 2nd edition May 1998, sections 2.2-2.6; ITU-R BS.1116-3 (02/2015), Scope and sections 8.2.3.1, 8.3.3.1, 8.4.1"
    },
    {
      "url": "https://www.itu.int/dms_pubrec/itu-r/rec/bs/R-REC-BS.1116-3-201502-I!!PDF-E.pdf",
      "note": "EBU Tech 3276 2nd edition May 1998, sections 2.2-2.6; ITU-R BS.1116-3 (02/2015), Scope and sections 8.2.3.1, 8.3.3.1, 8.4.1"
    }
  ]
}
```

Evidence claims:
- [sourced_fact] EBU Tech 3276 (2nd ed., 1998) and ITU-R BS.1116-3 (2015) set the same room targets. Average reverberation time is Tm = 0.25 x (V / 100 m3)^(1/3) seconds (BS.1116-3 measures it over 200 Hz-4 kHz). Early reflections in the first 15 ms should be at least 10 dB below the direct sound between 1 and 8 kHz. Background noise should preferably stay at NR 10 and never exceed NR 15, with -18 dBFS alignment. They differ on listening level: Tech 3276 uses 85 - 10 log(n) dB(A) for n channels, BS.1116-3 uses 78 +/- 0.25 dBA. Both are for assessment and reference listening rooms, not mix-room certification. · locator: EBU Tech 3276 2nd edition May 1998, sections 2.2-2.6; ITU-R BS.1116-3 (02/2015), Scope and sections 8.2.3.1, 8.3.3.1, 8.4.1 · source: https://tech.ebu.ch/docs/tech/tech3276.pdf

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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