@drlou77 so take this with a grain of salt…because this was with a Lumin U1 Mini streamer going into the Chord Qutest…I never tried the DH Labs Mirage with the M3. But the improvements were: natural tone, no hint of digital glare, fuller sound, fuller bass and the more vibrant midrange. Soundstage improved as well. You won’t know what the DH Labs is lacking until you try a USB cable such as the Audience. If you can move the components closer, you can pick up a used Audience USB for not much more than that new 2m Mirage. Try the mirage first. No need to go crazy as it’s a decent USB cable.
I assume you were running the Qutest with RCA cables. At some point, if you system allows, try the M3 with a good set of XLR cables. But as I mentioned earlier, get a baseline with your configuration as is. You can realize more if the M3 potential later.
When you connect the M3, don’t forget to set it to 0db volume to bypass the preamp section if you’re not using it as a preamp. The USB cable will take time to settle. Don’t rush any afditchanges.