C2 must definitely be 0 for a freshly burned CD-R...
If not, something has gone wrong with the process (the media and/or the burner) :iagree:
However, an audio CD (either pressed or burned) can be played perfectly
even if it has C2 errors, since they are correctable.
There is a very interesting post by rdgrimes in the media forum about C1/C2 scans interpretation.
And yes, reading speed matters in C1/C2 scans.