For comparison I connected my laptop directly to the Modius with USB-C, playing music sounded like it did when playing from the M50. I have an A-B switch so was able to listen to a comparison of the M50, my laptop, and Yamaha CD-S300 CD player. The CD player sounds best, and when playing from either the M50 or laptop the volume has to be increased 3 clicks on the amp to achieve the same level of loudness, but even at the same level of loudness the CD player sounds better. So to summarize, the M50 and laptop sounded the same, so it appears that the DAC is the difference, not the M50.