such CD where I can tell there is a noticeable hiss during quiet part the music.
Why does the master tape cause hissing?
Not all CDs are created from the original masters. Some of them are created from tapes of the originals. That's usually because the original master has been damaged or lost. They just create the CDs from the best tape recording they can salvage. Sometimes the original master is so old and degraded that an early tape recording of the master will sound BETTER than the original master.
... A book in the hand is worth two on the shelf!
--- Mystic BBS v1.12 A48 (Windows/64)
* Origin: The Unmarked Van - 21:1/130 - Mt. Healthy, Ohio (21:1/130)