your 1st question, need a DAC, yes, somewhere
a CD PLAYER has a laser to read the 1’s and 0’s and a DAC to convert them to analog line level signal.
a CD TRANSPORT just spins, it’s laser reads the 1’s and 0’s, sends the digital out to an external DAC.
some, not all, CD Players with their own DACs, let you choose to send the digital signal out to an external DAC, i.e. you can use the PLAYER like a TRANSPORT.