06-22-12: Onhwy61
I think Frogman is correct, but it should be put into perspective. Suppose you were an audiophile with limited funds. Would you be better off pursuing bass response down to 20Hz, or compromise at 50Hz (with room reinforcement) and put more money into going for a better quality midrange and treble? Unless you're an absolute bass fanatic the answer is self-evident.
It's only "self-evident" to those eager to sacrifice an octave of the music for a little extra refinement. Actually, different music-loving audiophiles split up their priorities and budgets in different ways, and full range frequency response is one of them. All the imaging and transparency in the world can get annoying over time if a conspicuous part of the pitch spectrum is missing.
I think there's a strong case to be made for making a pair of powered subwoofers part of a speaker budget. Not because I'm a bass freak, but because it may be a smarter way to split up the frequency range--and the money. These days there are some stupendous stand-mounted speakers at $3K or less, with transparency, excellent dispersion and therefore uniform power response, treble extension, soundstage and especially pinpoint imaging.
At some point when you build a passive loudspeaker system and you go for full range, a lot of the money is spent on cabinet rigidity and damping to keep the big woofer from smearing the rest of the sound emanating from the higher drivers. With separate subs it's easier to retain the transparency and imaging of the mini-monitor while adding a low frequency foundation that does not cost too much on one hand and doesn't smear the rest of the sound on the other. How many of us have heard a line of speakers where the stand-mounted unit sounded the best while the floorstanding version lost some of the magic just to get another 1/2 octave of bass extension?
With separate powered subs you get to retain the magic while adding the foundation. You also have the option of placing the subwoofers where they mate best with the room. How many times do we move full range speakers around, finding that one spot gives the best midrange/imaging/soundstage but another provides the best bass? It's pretty typical. Separate subs fix that, and you don't have to be a bass freak to appreciate it.
Also, it's more cost-effective. You could get a pair of Cirrus Vapors with the external crossover option, stands, and a pair of JL F112 subs for at least $5K less than a pair of Wilson Sophias. You'd get all that midrange transparency and treble extension of the ribbons, plus inner detail owing to the Herculean bracing and cabinet damping of the Vapors, plus the slam and dynamics of the JL powered subwoofers. The total package is cheaper because you don't have to damp and brace the monitor cabinets to keep deep bass waves under control--they're in a separate box.