i tried the *least expensive* rel, & i'd rather have *no* sub. sounded like one-note-thump, to me. for the same money, (and even if they cost more), i'd rather have my *two* vmps larger subs. of course, my sub system cost ~$2.4k, but this was buying the subs brand-gnu, the marchand x-over brand-gnu, the tara labs cabling brand-gnu, & the adcom 555 amps for $400 each - one brand-gnu back in '85, the other used a couple years ago. more careful shopping &/or getting a pair of vmps original subs, if your room isn't huge, would lower the price quite a bit.