Availability of Verbatim CD-R Music

Recently I had 20 Verbatim Music CD-R for use
bought in audio CD recorders.
The Result:
The Marantz DR6000 does not recognize these CD-R discs.
All other previously used CD-R are read.

The Pioneer PDR 509 recognizes the Verbatim Music CD-R
and you can take pictures.
The sound quality when playing but is hard.
The voices of performers appear changed compared
than the original.
The other previously used audio CD-R's were
such problems have not appreciably on.

Before purchasing a large number of Verbatim Music-
CD-R should be better make only a test.