Thank you very much for your input. I did a little more experimenting
and followed your suggestions.
On my previous experiments, I think I wasn't matching
the levels exactly enough during the -10 / +4 sensitivity experiments (Even though I was
using an spl meter). The psychocoustic effect of the louder signal made me believe that
the speaker's attenuator was messing with the sound quality. With classical music, and the
lowest sensitivity on the speaker, my digital level fader has to be around -10 or -5 and
it sounds quite lovely