In fact, the only sets of speakers I would rate more accurately than the NHT's would be some of the electrostatic speakers such as Martin-Logan, etc. But the Martin-Logan's and some of the other electrostatic speakers are in a much higher price range, so the comparison may not be fair. All in all, I rate these speakers highly for accuracy. However, do note carefully that they are not efficient speakers and will require large amounts of power to produce good dynamics and an impressive sound stage. After listening for a few days, I've found trade-offs.
Highs are more prestine.
Mid-bass and low notes have better articulation and rhythm, all weak points with the Supertwo. My fiance calls this muffled sound. I call it lack of transparency. The Supertwos are brand new year 2001 speakers with new technology and drivers. The SP2s are dynamic and transparent while the 2.5 are laid back and articulate and rhythmic.