I was curious about how driver excursion in a headphone corresponds to the volume that music is playing at.
For this question, let's use my current headphone as an example. It's the Audio Technica MSR7NC, a noise cancelling variant of the popular MSR7's.
So when I plug my headphones in to recharge them, I typically leave on the noise cancelling. According to the first chart I provided, the noise cancelling provides up to 15 decibels of noise cancellation in some frequencies, and a bit less in others.
Given this, for simplification, let's say that this results in the headphones "playing" some frequencies at 15 decibels for the 18+ hours that I'm not using them.
Then, let's say that I listen to the headphones for a few hours at normal listening levels, say 65-70 decibels.
I understand that decibels are logarithmic, so 65 decibels should be 10,000 times louder than 15 decibels, but I find it hard to believe that the drivers in the headphones are doing 10,000 times more work.
Does anyone have a way to estimate the excursion made by headphone drivers based on their diameter (45mm) and their volume of 15 decibels, at least relative to their excursion at 50 decibels louder? Finally, I want to be able to measure the total excursion of my headphone drivers after a given amount of time (like hours) at a given decibel. How many hours of active noise cancelling is equal to a few hours of normal volume listening in terms of driver excursion?
I want to know this because I don't want to switch my headphone's noise cancelling on and off all the time as the switch seems a little flimsy, but I also want to know what I'd be putting the drivers through this way (I charge them right next to my pc which is computing 24/7).