The iPhone 7 speaker ships with a
leashstick-on Wi-Fi diversity antenna that connects to the logic board.
Waterproofing alert! The speaker's output duct fits over a rubber speaker grille gasket for an added layer of ingress protection.
This design is nigh identical to the one we unearthed in the iPhone 7 Plus a couple hours ago.
The duct also has a fine mesh—in case the speaker grille doesn't do its water-blocking job.