NO SUB is the best sound by far. I have had REl, Revel, paradigm, Hsu, VC etc. and now they are all gone. Blending subwoofers is a never ending night mere for most especially me. My best success came from a professionally tuned Revel B-15, the a Rel sub and finally a totally inferior Paradigm. The paradigm got a bunch of hype from Stereophile for no reason the woofer is horrible as are most of pardigms speakers, mass produces with less then superior materials. Don't like at all/
I heard the REL G2 is really good and of course the speak on connection is special and far superior to either SE or XLR. I haven't heard the fathom but used for $1200 or so is really good, that woofer will not keep up with the G! or the G2, the driver is to small. Remember the 15 inch drivers disappear where as little drivers in subwoofers are often time easily locatable no matter how good you are at hitting the right crossover poinit.