I'm going out for a while now, but in the hope of a more productive discussion later, here are the elements of the system as I see it. Now there is something clearly set out to critique. There are a couple of assumptions: Initial energy input is from the picking of a string. All energy ultimately leaves the system to the atmosphere - assume an intangible musician So: 1/ Energy input into the system = picked string. 2/ Energy losses from the string are: - directly to the atmosphere - through forced vibration: via the nut (or fret, if a note is fretted) and the bridge to the guitar body 3/ Energy loss from the system is *increased* because the entire surface of the body vibrates and sheds energy into the atmosphere and the body has a *much greater* surface area than the string alone. 4/ The increased rate of energy loss from the string reduces the amplitude and duration of its vibration. 5/ This reduces the voltage induced in the pickup(s) which diminishes the loudness and sustain of the amplified signal. Therefore: The more (less) susceptible to forced vibration the body is, the more (less) rapidly it will rob energy from the strings and so reduce the loudness and sustain of the amplified signal. This means that less acoustically resonant guitars actually produce an amplified tone that is louder and more sustaining than more acoustically resonant guitars.