1.4.4 Note uses the phrase "four times (4x) quieter", but that seem a meaningless term. One can only talk about something being "four times louder" because loudness is measured relative to the absence of audible sound. "Four times quieter" would only make sense if noise A is compared with some other, even louder sound.
Proposed Change:
Change to read "Background sound that meets this requirement will be approximately one quarter as loud as the foreground audio content."
We have updated the note to read, "Background sound that meets this requirement will be approximately one quarter as loud as the foreground speech content."