The DACs I have used have all been inbuilt to the streamers I have used LINN sneaky / magik / and Klimax but the massive sound difference has been probably on the DAC side.
I also have an ARCAM CDS50 which is a cheap SACD / streamer but can act as standalone DAC so will experiment to see if I can hear difference .... I have had the Klimax and Arcam playing the same playlist into separate inputs on my pre and done a/b comparisons between them and not surprisingly the £5k one was better than the £700 one ...... but not by a huge amount.
Separate streamers into the same quality DAC would probably see less of a difference
I also have an ARCAM CDS50 which is a cheap SACD / streamer but can act as standalone DAC so will experiment to see if I can hear difference .... I have had the Klimax and Arcam playing the same playlist into separate inputs on my pre and done a/b comparisons between them and not surprisingly the £5k one was better than the £700 one ...... but not by a huge amount.
Separate streamers into the same quality DAC would probably see less of a difference