I have two Klipsch R-115 sw . subs 1 in front and 1 in back of an L Shaped living room.. I was wondering if it would be worth upgrading 1 R-115 to the PB 16 ? I would replace the 1 up front with the PB16.. All of my speaker distances are 11 to 12 feet from my seating location again L shaped, The total depth is probably 20Ft where the L goes back.. My back is against the wall where im 11 to 12 feet from my Audio gear and sub... I understand the sub is better but I do not have the money to buy two .. Would it be a bad idea to run 1 R-115 in back and the PB16 UP front, just wonering if adding 1 PB16 would be smart in my small room Thank you!!