klipsch rp1400

Looking to update my home theatre room with some new subs Room size 13.7 feet wide X 18.7 feet long with 9-foot ceilings, 4.2m by 5.7m 2.7m ceiling height, dedicated room. Current setup 7.3.4 has some old underperforming subs that I would like to update. I will start with one or two subs (if...