Monitor enthusiasts: musical subwoofers?


What makes a musical sub musical? I am considering the addition of a sub to my monitor-based system, but for the most part I find subs intrusive and difficult to "blend". In selecting a sub for use with a monitor type of speaker (rather than a large floor stander), what do you prefer? Stereo subs? Multiple smaller drivers? Any thoughts/suggestions/philosophies appreciated, Jb3
jb3
My nearfield setup consists of Modwright Swans M1 mini-monitors (4" Kevlar/paper woofers) and two NHT SW-2Si 10" ported subs. No money for REL. I cross them over 24 db/oct @ 80 Hz with a Marchand X9 Deluxe electronic crossover (modded by Dan Wright). My objectives were musicality, seamless transition and invisibility of the subs. Right on.

My plan is to get the Decware horn loaded sub. I heard Kevin Barrett's DIY horn loaded beast and a pair of VMPS Larger subs with a Marchand X9 and there is no comparison when it comes to speed and musicality. Horn subs win.
you should get 3 identical subs for the front array, but for best effect don't plug any of them in!