I wouldn't say it "needs" the Singxer to work properly since I use it with my Ayre CD player and it works great. I did an A/B test between the CD player and the Aurender using the same track of music however and the Ayre was noticeably better.
Singxer SU-1 with Aurender N100H
I'm curious to hear feedback from anyone who has used this combination. I am less concerned about the DAC but for reference I am using the Holo Audio Spring level three. I'm curious the degree to which the Singxer will result in improvement to the sound of the Aurender. Thanks!