Hello everyone i have lurked long enough I need some advice. Currently Mh ht setup is in my main floor living area and is being moved to the basement. Now it's all concrete/tile floor with 3 walls being drywall at about 18x25 . My theater will be in the back 1/2 of this room. I currently have a denon 1612 I believe I know it has the automatic calibration antenna deal. Speakers are all polk cs1, m60s front , can't remember book shelves for my surrounds maybe m30,40,50? My sub is a polk psw505. I would like to upgrade my center cs1 and move my m60s to my surrounds. Problem is they are discontinued and do not know what to replace with and have all matching. My other issue is my single sub. I know it's not regarded as highest of quality but my dilemma is , should I buy a splitter and a second psw505. Not really in the budget for a 2 new subs at 500$+ each. But from what I have gathered is that I need 2 subs. I am useinf this for 90/10 movies/music. I would really like to get that good felt punch in your chest from my bass with my movies. I know being on concrete will aid in that as right now it is more of a boom and shake bass being on main floor. Sorry for my grammar here I'm on my phone! Any advice is greatly appreciated