Amp play a low volumes?

Actually, there has been a more exhaustive study conducted some time after the Fletcher-Munson materials were presented. It supposedly delves deeper and with more accuracy as to exactly what takes place in our ears in terms of volume vs frequency response. Can't recall the name of it, so someone help me out on this one if you know.

Marakanetz, please expound upon your statement about speakers adjusted for the same listening level sounding "quieter" or "louder" than the other. I think i know where you are coming from / going to with this one, but i'm not sure. Sean
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I think that Robinson and Dadson (1956) are responsible for refining the work of Fletcher-Munson (1933). Can we trust these scientists? Lord knows Nyquist is not trusted.

How low(volumewise) can a real trumpet sound? How low can any brass instrument sound(also volumewise)? How low do you listen to a real piano or grand-piano in the room? Did you try to sing along with the singer that you hear from your speaker in unison or a-aapella or voice-duo? I think that how low should a speaker reveal its sounds as close as possible. If you're listening to an orchestra than the orchestra must be reproduced correspondedly proportional in your listening room(certainly there is no ideal reproduction of the recorded music but as close as possible).

Speakers with less distortion will sound quiter even if they are actually playing at higher volume levels. ATC active speakers for example. Without the "noise" of distortion things sound quieter.