Or better yet, the sub to match with a pair of 7B’s... the AA SW12 maybe. With your size of room you may not get the bottom end you’re looking for regardless of what speaker you try. You’re room is 16’ deep so you’re going to probably be around 35hz, so not sure you’re going to get in the low to mid 20’s. You’re 7B’s can hit 35hz. I don’t think it’s the speakers but speaker placement, working on room treatment and your room size to begin with.