I was wondering if I should purchase another sub for my system. It currently consists of: Harman/Kardon AVR-325 reciever Klipsch Quintet 5 piece speaker Polk Audio PSW250 subwoofer. The sub doesn't get the REAL deep frequency but does a good job for movies still. Now they say bass is not directional but I can tell the bass is coming from the front of the room. Now if I add something like a Klipsch RW-10 into the picture and put that in the front, then take the Polk Audio PSW250 and put that in the back would a see a big performance increase. Currently the tv is in the front of the room, couches in the middle of the room and then in the back I just have my two surrounds along with 2 cabinets. I have room to add the sub and I was wondering if it would make the room sound "more alive" in a way or not by adding the stronger bass in the front and then a little weaker bass in the back. Thank you for any input.