Finally: a seam we can't seem to beat. We fire up the hacksaw (and our ultrasonic cutter) and release the super beefy woofer.
If the magnet on this woofer looks big for a speaker this size, that's because it is. Deep, dramatic bass notes depend on a speaker's ability to move lots of air.
While that's traditionally done by increasing the cone's diameter, Apple instead increased the travel of the voice coil (to 20 mm p-p in this case), which in turn requires a bigger magnet. That way the speaker diameter stays small, but it can still move enough air to deliver quality bass notes.