Though only half the size of Yamaha NS10Ms, the V-4s sound quite a bit bigger.
The KRK V-4s are a good choice for anyone looking for warm, non-fatiguing, big-sounding active monitors with very small footprints. These pint-sized units transcend the usual shortcoming of small cabinets-insufficient low end-to produce an amazingly extended frequency response. In fact, I've never before heard monitors this small sound so good.
Drums sounded articulate and tight except for a little blurriness in the upper bass and low-midrange regions. Both the bass guitar and drums sounded a tad flabby in the upper bass region, but otherwise natural. Although I could clearly distinguish the pitches of bass notes down to low E, the V-4s could not reproduce the bottom-most octave in the audio spectrum (20 to 40 Hz). Note, however, that most other 2-way, close-field monitors are also deficient in this range, so this is not a criticism specifically of the V-4. Again, should you need a truer picture of what's going on down in the "thunder zone," you can always add a subwoofer.
Overall, I was impressed that I heard no holes in the midrange response while tracking with the V-4s. Also, the V-4's transient response proved outstanding. I only wish these monitors had a tad more zing in the top octave of the audible spectrum-but this is more a personal preference than an indictment.
Placed on the Monitor Traps, the V-4s sounded a tad boomy and veiled in the 150 to 300 Hz zone. But imaging, depth of soundstage, and especially the reproduction of transients were very good. The V-4s are not even slightly fatiguing to listen to over the course of long sessions.