I am puzzled by some JBL. Tech sheets list measured at 15 feet

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Was doing some digging on vintage JBL model crossover and was puzzled that JBL listed efficiency at 80 db. I knew the drivers fairly well and thought it to be miss print, but then saw this rating was at 15 feet, not the de facto 1 meter.

Checked a couple of other JBL marks (not individual drivers) of the time and sheets also used that distance. I can see this distance to have more importance to pro audio/ sound reinforcement circles.

Was or is this 15 feet measuring distance a general standard for that segment of audio or was JBL making their own ?

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Topic - I am puzzled by some JBL. Tech sheets list measured at 15 feet - Edp 08:26:17 02/18/24 (7)

RE: I am puzzled by some JBL. Tech sheets list measured at 15 feet - Scholl 09:58:07 02/23/24 (1)

RE: reference frequency calculator - Bill Fitzmaurice 11:13:40 02/23/24 (0)

RE: I am puzzled by some JBL. Tech sheets list measured at 15 feet - Bill Fitzmaurice 08:36:19 02/18/24 (4)

Are there present standards for that segment, not home audio? - Edp 08:47:47 02/18/24 (3)

RE: Are there present standards for that segment, not home audio? - Bill Fitzmaurice 09:39:48 02/18/24 (2)

RE: Are there present standards for that segment, not home audio? - claudej1@aol.com 18:41:01 02/18/24 (0)

Interesting, thanks - Edp 11:35:34 02/18/24 (0)

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