What is an HDCD setup?

Ramiro Arguello

>Reference Recordings, long known as an audiophile label, certainly lives
>up to its reputation.  The sound is spacious, the sonic spatial image
>detailed.  The complex textures of the Daugherty and the Del Tredici
>come across clear as water.  This is an HDCD disc, but I played it on a
>"regular" machine.  The spectacular sound knocked me over.  I'm not so
>sure it would be necessary for, say, Haydn string quartets, but for these
>works -- all essentially showpieces -- well, Yowza!  I can't even imagine
>what it would sound like on an HDCD setup.
>
>Steve Schwartz
>