Tight bass sub recommendations

@big greg, 
No problem.
@millercarbon,
I have no doubt 'The Swarm' works well, but it just makes sense that multiple subs will nullify/even out room nodes. Any of the subs listed would do that, when 4 or more were hooked up. 
The problem is who has that much space? Not all of us have a dedicated listening room.
B

2 REL S3s compliment my Martin Logan Montis.

Montis is run by a Krell KSA-200s. OMG

I have 2 more REL S3s put away for the 4 subwoofers effect. It can wait. My family is being kind as it is. Got them at a steal of a price. One day!!

That's the beauty of the Swarm approach. Because room reinforcement characteristics are so dominant, which sub matters much less than their number, location, and phase. And my understanding is, pretty much in that order. In other words four of just about anything beats one of just about anything. Especially if the four are optimally located, powered and phased. Might be a bit of an exaggeration or over generalization but this crowd being such a hard sell its warranted.

My set will use the same four 10" drivers, but in two different enclosures- two sealed and two ported. Plugging a port converts a cab into a sealed enclosure, making for three optional configurations. Together with placement and phase that is a huge amount of tuning flexibility and control!

The vast majority still do not appreciate what a game-changer this is. Which is good- I have a Talon Roc sub to sell! Depending on what that goes for this may turn out to be one of the most cost-effective upgrades ever!