fuller sound at lower volumes


I am looking for a fuller, richer, and deeper sound at lower volumes. My current system is a Musical Fidelity a3.2 integrated, a3.2cd player, and Paradigm Studio 40 v.3 on stands. My room is about 18x12x8. I am thinking about a McIntosh MA6500 integrated. Or would adding a good subwoofer be of benefit?
valinar
A good equalizer or an amplifier with loudness control.

look into the Fletcher munson curve
We've had three versions of Paradigm Studio 100's and it wasn't until good fortune smiled and we acquired a pair of used Avalon Eidolons that we realized just how good our system could sound at low volumes. I think your electronics are fine. I would take the suggestions here and at least demo a powered sub.

BTW we liked the version 2's hands down the best in our room.
Tube preamp and more efficient speakers will breather life into the system at low volumes...of course, then you might want a tube amp better matched to those more efficient speaks...a slippery slope, but a fun one!