CD has a dynamic range of 96 db.
The noise floor in quiet environments is around 30 db spl.
If you listen at more than 96 + 30 = 126 db SPL then you might benefit from HDCD over a regular CD (both recorded with a large dynamic range)
Few, if any recordings exploit the full dynamic range on existing CD's (see CD Loudness Wars on Wikipedia).
As a playback system the CD standard is already good enough.
Most high end audiophile speakers limit the consumer to about 70 db dynamic range anyway.
Studios benefit from the flexibility of more dynamic range but it is unnecessary for most playback systems.
The noise floor in quiet environments is around 30 db spl.
If you listen at more than 96 + 30 = 126 db SPL then you might benefit from HDCD over a regular CD (both recorded with a large dynamic range)
Few, if any recordings exploit the full dynamic range on existing CD's (see CD Loudness Wars on Wikipedia).
As a playback system the CD standard is already good enough.
Most high end audiophile speakers limit the consumer to about 70 db dynamic range anyway.
Studios benefit from the flexibility of more dynamic range but it is unnecessary for most playback systems.