Hello all!

I am looking into upgrading my home theather system. My amplifier is a Yamaha DSP-A3090, which is old but still holds it's own. bic america center channel speaker, Pioneer HPM-60 loud speakers for the mains, then the rears are a pair of Polk T15 bookshelf speakers. For the most part I am happy with this set up, but the HPM-60's are aging and I would really like to have more bass reproduction. These pioneers actually do quite well on bass (they do have 10' woofer) but I am wondering if a dedicated (budget) sub would out do them noticeably.

Please keep in mind that I am far from an audiophile and this may seem like a dumb question. I just do not want to spend the 200-400 dollars on a sub if the main speakers I currently have would be comparable.