Hi: Thinking of adding this sub to my system when I get my M80's shortly. Looking the specs of this subwoofer I'm thinking the 80's will not benefit at all as they go almost as deep as the Paradigm does?So am I better to spend more on a sub when I have the cash.....not looking for earth shattering bass either my room is 14.5 x 20 x 9.....live in a townhouse so there is my ?. Thanks for the help!!!

http://www.paradigm.com/products-hidden/...-leg/page=specs

Paradigm 800F,Paradigm C600,Axiom QS8 v3,Paradigm DSP-3100 Sub,AVR Anthem MRX-740