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I think you find what you need from the Society of Motion Pictures and Television Engineers. Dolby is very active in contributing to the guidelines and documents SMPTE develop and they can be viewed as industry references.
Relevant documents include:
SMPTE ST 202: Defines the target B-chain electroacoustic response and measurement methodology for cinema playback systems.
SMPTE RP 200: Covers reference playback levels and gain calibration using pink noise.
SMPTE RP 2096-1: Provides practical guidance on cinema sound system setup and calibration using modern measurement techniques.
SMPTE RP 2096-2: Covers maintenance calibration and ongoing system verification.
For subwoofer EQ specifically, the standards tend to define performance targets and measurement approaches rather than prescribing detailed filter settings. The RP 2096 documents are probably the most relevant starting point.
These documents are publicly available through the SMPTE Standards Library.
Thanks,
Matt