How the MacBook Pro (2021) plays sub-bass as audible sound on its built-in speaker

February 22, 2025MacBook,Mac

The MacBook Pro appears to use an octave-shift-like process to make audible sounds in the bass to sub-bass bands that should not be reproduced by the built-in speaker.

✦Tested environment:
– Apple MacBooK Pro 14” (M1 Pro, 2021)
– macOS Monterey
– MacBook Internal speaker and mic
– VB-Cable for Mac
https://vb-audio.com/Cable/
– Audio Function Generator PRO (for iOS)
– SpectrumView by Oxford Wave Research (for iOS)
https://oxfordwaveresearch.com/products/spectrumviewapp/

✦Tested date: December 19, 2021