It was an R.E.L sub that first truly showed me 'hall effect' on Eva Cassidy's "Fields of Gold" (with no discernible bass on the track). I used (and still have) an R.E.L. Britannica B1 sub for my main audio for years. (Also own an R.E.L. Storm III).
Now I use two SVS SB-2000 subs and one SB-3000 (all sealed) for three as a D.B.A. in my audio-only room. I won't go back to the REL though it was great. I would strongly recommend going the distributed bass array route if possible (not always I know). R.E.L. is great. SVS is great too, but a better monetary value.