Who are some of elite sub woofers?

yes Duke for those of us running Vandersteen floor standers w built in subs and EQ adding more vanderyEq subs gets most If not all the swarm effect. There is some spatial info above the filter, so placement is still important.

what is amazing and should be celebrated are the amazing choices we have in high quality and affordable subs, elite or not so much...

as an aside for the OP and perhaps others...

buy, read and try out many of the tips in Jim Smiths excellent book - Get Better Sound

buy an SPL meter and a test disc or download Vandertones for free - see what your room is doing...and begin to correlate that to what you hear...

listen to just your sub......hm........not all much there..are ya sure you need it ? or need it that loud....

fun

I would go with REL.  They are less detectable and they create a 3 dimensional sound stage.  

I have one SVS SB16-Ultra and really like it.  I had the SB13-Ultra for about a year when the SB16 came out ... I simply traded it in for full purchase price and upgraded to the SB16.  Very good customer service / trade-up policy.  I'd add this one to your list if you are one of the "masses" or if your interested in a reasonably priced subwoofer on Stereophile's Recommended List "A".

@larry5729

It’s a subwoofer, impossible for it to have soundstage depth, unless talking stereo use with each sub playing either the left or right channel.

mzkmxcv"It’s a subwoofer, impossible for it to have soundstage depth, unless talking stereo use with each sub playing either the left or right channel."

This is a Statement of Faith and for that reason, logic, and explanation by definition there is no arguing, disputing, or challenging the poster’s Faith or his Belief. However it is easily contradicted, invalidated, and rendered false by actual science, engineering, and experience but some people like to reference a "Book" to explain, justify, or rationalize their Beliefs, Convictions, and Practices. Say Hallelujah!