Yes, my Rotel/Axiom system is stereo only. Unfortunately, I still have a HTIB for home theater. As you can see below, I have M60s, but I believe, and many had suggested that it can benefit from adding a sub, which will be used later in a HT application. What makes a sub more musical than another one?

I would love those links please, or any other readings on subs for stereo.

Axiom M60s, QS4s, VP100 Onkyo TX-SR804 Oppo 970HD Rotel RB-1080/RCD-1072 REL Q150E sub, PS 3