Sorry for the late repply...
The Velo DLS...stay away,its a punch unit. Anu sub that cannot deliver down deep,is not a sub... a wannabe garbage box. The Paradigm DSP series,at first they so8unded promissing ,nah...again they are optimised for the masses that does know better.
Elemental Designs and Epik,this where you get the most for the dollar,and do not have to wait long to get the product. $600-800 you can get great performance and 16Hz output that is not only usable but of worth. Very deep bass extension is of littloe use if the output is too poor.
The sealed Dayton from PE,you can get better performance from eD or Epik for the dollar.
Klipsch,Dynaudio,Paradigm Signature,Pioneer Elite,Krell,Tenor Audio,Anthem Statement,SimAudio MOON,Parasound HALO,Bryston,ATI,Onkyo Integra,Denon,JL Audio,Sunfire,TC Sounds,Acoupower,QSC PowerLight,Crown iTech,Furman,Chang,PS Audio and more in the house.
Too much gear,never too much music.