Do not know what your source is but it may be a little lacking or processed. Some folks are beginning to recognize the musicality of well implemented non oversampling DACs - saying that even the best delta sigma dac implementation(s) sound less natural. Think Schitt
Yggdrasil, Audio GD-7, MDHT Pagoda, Denafrips Terminator, AMR 77 SE, etc. Second I would look at tube amp(s) and/or upgrading your preamp to something like a deHavilland or Dan Sachs. Finally, maybe what your wife is missing is something more dynamic and "wide open" - like open baffle speakers (Spatial Audio M3 Triode Master, GR-Research Super V), Magnepan, or even high efficiency horns. If you generally like the sound of the Wilsons, though, I would look at the source first, then the amplification.
