a90 discrete

Selling my headphone stack and posting here before I move to eBay, etc. I have sold here before, and one of my buyers was kind enough to go out of their way to post feedback: https://www.audiosciencereview.com/forum/index.php?threads/f-s-okto-research-dac8-pro.35731/ Dan Clark Aeon 2 Noire w...

Hey guys, Heard a lot of good things about the A90D and wanted to experience it myself so I got it a few days ago from Shenzhen. As I opened it and tried it out I immediately had 2 issues: 1. There is a very noticeable static sound (crackling and popping) on the right side of the headphone/iem...

I found not many teardowns with this model, especially with the output transistors uncovered and with surrounding close-ups, so I decided to purchase one for myself (second hand) to pair it with my D90 MQA then write an article here on ASR. Looks like taking the PCB out from the case if somehow...