Hi all,
New to the forum, so sorry if this is in the wrong place. Just a heads-up that I bought a KA11 on AliExpress from the Fiio store. Really disappointed. I have the lightning version. Sound was absolutely fantastic when I first plugged it in. Then after about half an hour of use, the left channel went to a low volume level with heavy distortion. Same thing happened on one or two further uses. Now when I plug it in to the iPhone (11 pro) although the light comes on, audio is not rerouted out of the DAC, and just continues to come out of the iPhone internal speaker. I have tried to raise a dispute on AliExpress three times - but the best they offered was to return the DAC to china at my own expense. I paid around €30, and that is almost the exact cost to return it to China from Belgium. So a lousy first experience for me of Fiio. Faulty product, and a refusal to do the right thing. Quite surprised as they have a lot of fans on here and other forums.
For ref, I am using a pair of DT-770 pros from Beyerdynamic, which work perfectly with other devices, and with the same phone through the Apple lightning to headphone adaptor. Also FYI - I have also tried the device with my iPad - same problems. Both phone and iPad have latest version of iOS. Fiio also suggested I update the firmware, but offer a PC .exe file to do this. I have a mac. And there is no way to connect the lightning version of the FA11 to a computer in any case, unless someone knows how. Perhaps with a lightning to USB-C adaptor. In any case I haven't seen this issue reported elsewhere, so I think it's a fault not a firmware issue.
Cheers.