Need opinions on duping CD's

OP

I don’t know the the machine that you are using, but If it is a CD recorder, with the original in one tray and the copy in the other, then the DAC in the machine should be a non factor.  All that is happening is the digits are being scanned and read and then passed and burned to the copy.  The DAC on these machines is in case you want to listen to either the original or the copy

OP

  I had burned many CDs using one of those machines in the nineties and was almost always of the opinion that the copy sounded superior when played back on my regular system.  That machine died and then I used an Apple Computer to make copies and then I thought the results were more variable, but that might have had something to do with the I tunes software.
   There are endless debates here as to whether CDs sound better when played from a transport or when burned to to a HD and then played back from either a dedicated streamer or a PC.  It is a variation on the question that you are asking, which is how can Digital copy sound better than the original?  There are a lot of theoretical reasons as to why a copy might sound better, and they tend to come down to the copies may have less jitter.  Personally, I think it depends on the quality of the playback equipment.  A really good transport -DAC combination can best a good streamer, or vice versa.  Just my two cents