Hi, I have Crites speakers which are about the same dimensions and efficiency I have been tweeking my system for 3 years. Slowly and surely I have improved the sound. My room is 12 × 21. That is about the minimum width. Here are some suggestion:
1. Keep dimensions from sidewall and back wall different. I found the center of the speaker to measure during setup. They are toed in to intersect behind my head. I would not put them against the back wall.
2. Room treatments. Most important are the sidewalls. I have 2 bass traps but am told a couple more would help.There are several good companies.
3. Speaker isolation. I bought springs on Amazon. A very nice improvment. You can spend much more.
4. Lower noise floor on streaming system.
5. It is best to keep equipment behind speakers or somewhere else.