Some people have been claiming that the Topping A90D is the best headphone amplifier you can get, beating even more expensive products. But what's the truth? I took at look at what is actually inside. I also compare it to the Singxer SA-1 and Soncoz SGA1, as well as higher-end gear, using a variety of headphones, such as the Dan Clark Audio (DCA) Stealth, Expanse, Final D8000, Meze Elite and others.

Thanks to APOS Audio for sending me one for review. You can buy it via this link, which supports my channel:
https://www.hear.audio/go/a90d
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00:00 Start
07:47 Inside the A90D
13:51 Sound
21:43 One final thing...