Bruce (Bifwynne), the lengthy response Ralph (Atmasphere) provided above to your last post provides, IMO, a nuanced, balanced, and technically sound perspective on the issue, derived obviously from extensive experience as well as technical expertise.
Here is another idea to consider, though: Supplement your dynamic speakers and the ARC amplifier with a set of Stax electrostatic headphones and a dedicated Stax headphone amplifier. That's what I do, and I really enjoy having the two different perspectives on what a given recording has to offer. As well as the fact that headphones eliminate (and facilitate assessment of) room issues, and allow me to listen at times when listening via speakers would conflict with my wife's activities.
Just a thought. Best,
-- Al