If it's a dedicated room, treat it. That will be LOT cheaper than any component (Audio Advisor has Sonex on sale right now), and will make an immense difference. Back in the day, I had LEDE (live end/dead end) setup, and the difference was immense, particularly with dynamic (rather than planar) speakers.
The Jim Smith book is a good suggestion. I also like "Good Sound," the Laura Dearborn book. Some parts are vexing for the in-the-know audio hobbyist, but there's good information in there as well.
Start with the small things, before investing in new equipment. If it's the Oppo 95, that's a very well-regarded music player, so you should be in good shape there. Good luck.
The Jim Smith book is a good suggestion. I also like "Good Sound," the Laura Dearborn book. Some parts are vexing for the in-the-know audio hobbyist, but there's good information in there as well.
Start with the small things, before investing in new equipment. If it's the Oppo 95, that's a very well-regarded music player, so you should be in good shape there. Good luck.