Below are excerpts from the review:
Given the really really low driving power of ddHIFI TC35C, it can only be paired with IEMs and portable earphones, no headphones unless they are super sensitive. I have successfully paired it with Moondrop Stellaris, Unique Melody Mavsn PRO, KIWI Ears Orchestra Lite, Dunu Talos, and Tangzu Zetian Wu Heyday Edition. It can drive all of those with ease, can get really loud at maximum, but regardless of the volume, there is a bit of hissing in the background while music is playing,. You typically won’t hear this with normal listening volumes, but if you listen really quiet, you can hear it, though it is faint. The overall sound is actually super good, with a dynamic, punchy sound. It handles low and medium volumes best, and after 80% the sound can get a bit shouty and becomes a bit distorted, so it is best for those who don’t listen too loud.
From: Audiophile Heaven