I stumbled on to an Atlantic Records 50th anniversary HDCD CD.
I was using my mac mini USB to optical out to the optical inputs of my Denon DVD-5000 using it as a DAC. I can control the output of iTunes volume to the 5000, and since the Denon can encode or has a chip to encode HDCD CD's I noticed there was a switch going on in the player.
As soon as I reached a high enough volume or near full volume, the HDCD mode switched on, indicated on the front panel by a red little light and bam, almost two fold quality, I couldnt believe it!
I thought it was my 5000 going bad or something, but I was floored how I much the quality increased. There was instantly more presence to the music, it was an exprience. And it works, the decoding with a lossless rip of the CD too.
Now, I'm looking for a few favs on HDCD. ITs not dead in Asia I see.