It is a good question. I am suprised you havent gotten more responses as yet. Unfortunately, I havent got the expertise you need.
How does transport contribute sonically on CDs?
My experience in combining various Redbook-CD transports and DACs is more limited than some here, but there seems to be a sonic signature carried by many transports, regardless of the DAC used. Would like to hear what others have found, with specific examples. E.g., are there transports known for having extended, well-defined bass fairly independent of the DAC employed (assuming that a tube DAC is not used!).