# What do the REW help pages say about what room measurements and EQ can and cannot fix, and what RT60 target they give for a small mixing room?

- id: art_01M5MSE2SYEGMFJJF5FZSXHBDG
- 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: 2026-10-23T16:27:48.918Z
- url: https://veyrul.com/articles/art_01M5MSE2SYEGMFJJF5FZSXHBDG

REW's help says room EQ is valid only at the measured position. EQ can tame response peaks, especially low ones, but not deep narrow dips, which are position-sensitive and need headroom EQ doesn't have. A 1/3-octave RTA is too coarse to see those dips. In domestic-size rooms RT60 isn't meaningful below a few hundred Hz (modal behaviour, no diffuse field). Recommended RT60 is about 0.3 s under 50 m3 and 0.4-0.6 s up to 200 m3. C50 indicates speech clarity and C80 music clarity. REW's room simulator treats every source as omnidirectional.

REW's help says room EQ is valid only at the measured position. EQ can tame response peaks, especially low ones, but not deep narrow dips, which are position-sensitive and need headroom EQ doesn't have. A 1/3-octave RTA is too coarse to see those dips. In domestic-size rooms RT60 isn't meaningful below a few hundred Hz (modal behaviour, no diffuse field). Recommended RT60 is about 0.3 s under 50 m3 and 0.4-0.6 s up to 200 m3. C50 indicates speech clarity and C80 music clarity. REW's room simulator treats every source as omnidirectional.

Curator qualifications: Documents read 2026-10-22; no room measured. REW help files Last-Modified 2023-12-16 carried from producer reading.

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://www.roomeqwizard.com/help/help_en-GB/html/iseqtheanswer.html",
      "note": "REW help: Is EQ the answer?; REW help: RT60 graph; REW help: Room Simulator"
    },
    {
      "url": "https://www.roomeqwizard.com/help/help_en-GB/html/graph_rt60.html",
      "note": "REW help: Is EQ the answer?; REW help: RT60 graph; REW help: Room Simulator"
    },
    {
      "url": "https://www.roomeqwizard.com/help/help_en-GB/html/modalsim.html",
      "note": "REW help: Is EQ the answer?; REW help: RT60 graph; REW help: Room Simulator"
    }
  ]
}
```

Evidence claims:
- [sourced_fact] REW's help says room EQ is valid only at the measured position. EQ can tame response peaks, especially low ones, but not deep narrow dips, which are position-sensitive and need headroom EQ doesn't have. A 1/3-octave RTA is too coarse to see those dips. In domestic-size rooms RT60 isn't meaningful below a few hundred Hz (modal behaviour, no diffuse field). Recommended RT60 is about 0.3 s under 50 m3 and 0.4-0.6 s up to 200 m3. C50 indicates speech clarity and C80 music clarity. REW's room simulator treats every source as omnidirectional. · locator: REW help: Is EQ the answer?; REW help: RT60 graph; REW help: Room Simulator · source: https://www.roomeqwizard.com/help/help_en-GB/html/iseqtheanswer.html

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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