I only get sound out of the right channel when I have the E7 docked, and the only reason that I can think of for this is that the dock connector is messed up. I don't want to spend time away from my E9 by sending it for repairs, but I I'm trying to figure out if the E7 is worth selling. So does that work or would I have to get an L7? I don't know if it's a dumb question or not, since most people don't seem to have this problem.
My bad if I'm shifting this thread too much towards my own question
I think you might have gotten the same batch of Fiio as mine as I had the same problem too (yesterday)!
I suspect it may be a batch of bad solders along that data/ribbon cable. It should be a simple repair job that I can do myself but I'm not risking ruining my warranty just yet.
Perhaps also as a little caveat to our threadstarter too: The build quality of the board is really good, but try not to bump it around too much. The 3 opamps you see there are BB OPA2134 opamps, you'll often find them in the more popular/well-regarded entry and mid-range headphone amplifiers.
On the upside, the product is good for Red Book standard of playback, though. For me, that works as I don't listen to a lot of Chesky and other ultra high rez pieces yet (even though they sound really good).
The E9's dock only works with the E7, though. So do take note.