2019 California Standards for Accessible Design Guide (effective January 1, 2020 with July 1, 2021 amendments)

11B-219.2 Required systems.

An assistive listening system shall be provided in assembly areas, including conference and meeting rooms.

[2010 ADA Standards] 219.2 Required Systems. In each assembly area where audible communication is integral to the use of the space, an assistive listening system shall be provided.

Exception: This section does not apply to systems used exclusively for paging, background music, or a combination of these two uses.  

[2010 ADA Standards] EXCEPTION: Other than in courtrooms, assistive listening systems shall not be required where audio amplification is not provided.