On Rel subs: Which are most musical?


It appears that rel makes some of the more musical audiophile quality subwoofers.
My question is which rel model do I go for? I am looking for a sub that isn't too big, is not sloppy but tight, blends in and fills the room with a natural sound that makes it sound as though it's live, in a very articulate realistic sounding system.
For what I am looking for do I look for a big size driver such as 15" or a smaller driver such as a 10" or 8" driver? Does a two driver sub do better than single?
What are the pros and cons between the two?
Does a smaller driver give me tighter bass and a bigger one give me lower and fuller bass?
pedrillo
the neutrik connection take the signal from the terminals of the speaker amp. how can you use mini dsp?  you cant...
Many high end full range speakers actually do have downward firing woofers or ports, and a basic understanding of acoustics can go a long way to getting better sound. Also, Neutric makes great XLR plugs but the Speakon plug (love those things…use 'em in pro audio) used for the REL "high level" input is somewhat unique to Neutrik as I think they invented it (el cheapo copies are around). Friggin' Lichtenstein.
Sorry @murphythecat I misread something. :)  Neutrik makes a lot of connectors, and in this case the confusion was that I was talking about XLR and you were talking about speaker connectors.

Best,

Erik
The key word was "normally". Low frequencies cover quite a range. In any case, those who make speakers with those woofers down under can have them for themselves.
I don't think of subs a musical at all....I use them to correct room resonances, and make mids and highs cleaner/clearer.