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The iPhone 7 still uses the same Apple/Cirrus Logic 338S00105 Audio Codec as in the iPhone 6S, but the Audio Amplifier has changed to the new 338S00220. (previously 338S1285).
We found not just 2 but 3 Audio Amplifiers - we speculate there is one audio amplifier for for each of the two speakers, and the third amplifier is for the headphone via the Lightning port.
The third Audio amplifier is situated next to the Applications Processor Module with 3 black blobs on it. It was discovered during de-soldering of the A10 applications processor. When the blob was scraped off, it was an ‘oh wow, there are 3 audio amps!’ kind of discovery. Chipworks has a Basic Functional Analysis Report of the Apple/Cirrus Logic 338S1285.
Note******** ifixit teardown report only lists 2 audio amps ....Chipworks discovered the third amp