I owned the Calypso for approximately 3 years and loved it. I now have the Calypso Signature and can tell you it's wonderful and definitely better than the base Calypso. The signature is more refined, focused and sounds very lifelike to me. The imaging is really pinpoint and the Signature version is even smoother than the original. Bass notes are more defined, the highs are extended yet very smooth and relaxed... and piano is very realistic with the Signature, unlike any other system I have previously owned.
Keep in mind, I'm using the Signature with the CJ Premier 140 amp, vs. having used a McIntosh MC275 MK V with the regular Calypso. Even with that being said, I originally tried a CJ Premier 14 preamp with my CJ Premier 140 amp... and the Calypso Signature has proven to be a substantial upgrade... as it should for almost twice the price ;-)
Keep in mind, I'm using the Signature with the CJ Premier 140 amp, vs. having used a McIntosh MC275 MK V with the regular Calypso. Even with that being said, I originally tried a CJ Premier 14 preamp with my CJ Premier 140 amp... and the Calypso Signature has proven to be a substantial upgrade... as it should for almost twice the price ;-)