Here's one
http://www.audiocircle.com/index.php?topic=105310.msg1129975#msg1129975BPT says:I had early interest when Hypex started and was on the fence about purchasing until the upgraded UCD400HG became available. I bought 4 modules and built 2 stereo amps with very good linear power supplies (for bi-amping my OB line source speakers). Was very pleased with the performance. Did some tweaking with the input capacitors and output filter network with minor improvements. Decided to go all out and built battery power supplies for them at +/- 48VDC. They were sooo quiet with great soundstage depth. Some members may have heard them in my exhibit room three years back at RMAF. After a couple years the batteries started to become a bit of a pain so I went back to linear supplies. In an effort for further improvements, I removed the input capacitors completely and had a nice improvement. That is how I have been listening the past couple years.
Enter the NC400. I dropped them in my system to drive my OB panels from 200Hz up. While the supplied power cords looked nice, I used my own designs because I know their sound making it easier to hear overall changes in the sound of the system. Tonally they sound almost identical to my UCD400HGs (which means, very neutral). They are very quiet (as advertised) with an extremely good soundstage. The big question for me is are they better than mine since I use a good linear supply vs. their switching supply. The answer is yes. In the midrange it was close, but I felt the NCs had a better sense of space with improvements in very low level detail retrieval. Maybe a 5% improvement. The high frequencies were an easier call with the NCs being much cleaner and musical. A good 15% improvement over the UCDHGs. I did not test the bass performance. So, yes they are better and yes, they are worth purchasing. How will these babies sound with a really great linear power supply?
Chris H.
BPT
