To start out, I own both of these speakers. I have owned the Paradigm Studio 20's (v4) for a while, and I just recently bought a used pair of NHT Classic three's.
I bought the NHT Classic three's because I really enjoy a rich midrange (like the NHT superzero's produce) and I reasoned the Classic three's would be similar in resolution and detail to the Studio 20's but with a bolder midrange.
Upon listening to the speakers (going back and forth between the two pairs) it sounded like the Classic three's had a slightly warmer midrange, however the soundstage, imaging and detail of the Studio 20's was much better. All in all the Studio 20's sounded a lot better to me.
From everything I have read about the Classic three's, they should be as good or better than the Studio 20's in every important department (soundstage, imaging, detail, speed), but this is not what I experienced.
So, I have two conclusions.
1) The Studio 20's really are superior speakers.
2) The amplifier I am using is not bringing the Classic three's to life. (my amp is a 20 wpc Furman SP-20
. It as a high quality studio amp, and although it is a low wattage amp it gets pretty loud and sounds quite good to me powering my superzero's or Studio 20's.)
I would love your opinions regarding these speakers. What would be most helpful is if someone else has (or has heard) both of these speakers and can give me their opinion.