I keep hear about "Details opening up" with amping and I am at a complete loss as to why this would be true unless it is on the human side of the equation and is based on more detail being available to our ears at higher volume levels. Somebody please take a look at my understanding as written below and tell me what I am missing. A given iem/headphone has an impedance or ability to resist the flow of current that changes at different frequencies but is generally summarized by a single value such as 32 ohm, 50 ohm etc. This characteristic is specific to the drivers used and does not change regardless of what kind of circuit you put in front of the driver. Sensitivity in dB is the ability to produce sound given a specific amount of current to work with and is measured at a specific frequency in order to provide an apples to apples comparison as some frequencies will be more than the listed sensitivity and others less due to the fact that some sounds require more energy to reproduce than others. Based on the above if one amp is capable of providing 300mW into a 50Ohm set of headphones with a sensitivity of 92dB (1kHz,1mW), If we back away from the maximum to allow for the previously mentioned impedance variation and use an output power of 200mW, how would it not produce the same exact sound at the ear as any other amp that was set to push 200mW output? I don't understand how more detail can be present in the same signal and mathematically the numbers are the same unless you increase the current outflow of the system which is exactly what an amp is designed to do. I can only surmise that what is perceived as "details opening up" is actually the ability to boost volume to a level where those details that were always present in the signal are now audible to the listener. So if I own the headphone I referenced above (Fostex Trp series) as most of us do and can happily listen to them with an amp that puts out up to 1Watt (Magni2) there really would be no benefit in chasing an amp that can push the headphones to their maximum input power of 3 Watts as all this would accomplish is the rapid destruction of my hearing. What am I missing in this equation?