AirPods 4 vs old AirPods- What's the difference?

Macworld Apple has updated the AirPods, removing the 3rd and 2nd generation AirPods from the line-up and introducing AirPods 4 in two formats: with and without ANC (Active Noise Cancellation). The 2024 AirPods feature a new design intended to make them more comfortable to wear, new acoustic architecture with low-distortion driver and high dynamic range amplifier, personalized Spatial Audio with dynamic head tracking, an H