i have a HTIB (i know, no comments needed on that decision - i'm not an audiophile, or home theater expert by any means), here is the set...

now, i hear it is better to have the speakers match, etc...but i'm not looking to upgrade all the speakers just yet...my sub has gone kaput...so i'm looking to replace this sub...i saw someone mentioned the Energy ESW-8 (here)...would this work with the other speakers i have? don't know if receiver info is necessary for your suggestions, but if it is i have the yamaha htr-5740.

thanks for any tips you can provide...