Yeah, I hate stacking too, but I guess unless I buy another DAP and experiment, I can't really think of a solution that's viable for now. Mhmm, I didn't mean to sound like DP-X1 as a whole is a bad DAP. I think it was just my unit that was faulty. Like you said, every DAP has their strengths, weaknesses and issues associated. Thank you for wishing me luck. I'll post an update once I figure things out.
I agree as well. The unstable jacks are inherent from how it was initially designed.
The hissing, hmm, I think everyone will hear it on some levels depending on what headphones they use (like you said). I tried it with four different iem's of different impedance and sensitivity and three different headphones with again different impedance and sensitivity, and I could hear it when downloading and playing on stock player or streaming via Spotify/Tidal. I highly doubt that routers will make any difference since I tried both 2.4Ghz and 5Ghz bands.
Yeah, that's true. I heard about Fiio X7 and its problems. I start to think that Android-based DAPs haven't matured yet and have some problems to begin with.
Mhmm, I didn't mean to sound like DP-X1 as a whole is a bad DAP. It's a great one as far as I can tell from other's experiences. I did ask the seller from Japan if it was the newest batch and they said it was, so who knows.