I’m dubious about the need or benefit of multiple woofers, unless you need the floor to bounce, and like banging your head. I had a friend who’s method of evaluating a speaker was to turn the bass up to 11, and the volume up to twice that. He drove me to 11 when he pulled it on my setup.
I have an SVS SB-3000, now ain my multi-media room, and the REL, mentioned above, very recently acquired. SVS advises keeping the settings such that you can’t spatially locate the sub with your ears. I like that advice. Still, head-jarring volumes are possible if it’s your thing. The REL to my ears has a very desirable, more subtle quality about its bass by nature. I haven’t been able to replicate the "boom" with the REL. I’m ok with that.
You’ll have to experience both yourself, I’m not too sorry to say. Have fun, and Best Wishes.