I thought that physically, it is lower-pressure, since sound is physical, and the inverted sound waves that the ANC generates cancel out those from the noise source. Looking at the diagram on https://en.wikipedia.org/wiki/Active_noise_control , I'm not getting how the amplitude is higher, since the resulting sound is quieter, which I'm translating to lower SPL (lower acoustical pressure).
Thought experiment: suppose you have super-loud bass coming from a single point-source at 30hz. You can feel this in your chest. Now, you put a second point-source 180 degrees out of phase in the same place. What would the pressure on your chest feel like? How is this different from how ANC works?
Thought experiment: suppose you have super-loud bass coming from a single point-source at 30hz. You can feel this in your chest. Now, you put a second point-source 180 degrees out of phase in the same place. What would the pressure on your chest feel like? How is this different from how ANC works?