You would benefit greatly by consulting an acoustician. Jeff at HDacoustics is very good and he designed my room which I built while my speakers were being built. He can design which treatments to use and precisely where to put them. He is very reasonable with his fee and there would be no months or years trying to get it right. As others have said your current speakers will probably work great. My speakers are bigger too in a room similar to yours in size. You can check out my system I have it listed. Good luck!
Recommendations for speakers in a much smaller listening room.
My wife and I are in the process of buying and moving to a new patio home. We are both pretty excited about it. The only issue is I will have a much smaller listening room. I currently have a room that is 14.5 x 38, basically one half of the basement. The new room will be 12 x 16 with 8' ceilings.(taller than pervious room at 6'8") The question is what is a good speaker for that size room that will not overload the room. I like sound stage, imaging and listenability over analytical and highly detailed. My current speakers are Tyler acoustics Woodmere II and are giant towers. I do some vinyl on a vintage Panasonic DD TT with Ortofon MC1 cart. Mostly streaming with a Lumin T2, Oppo Digital 105 for disks with a Modwright KWH 225i. Thanks for any suggestions, Allen.