FiiO KA13 vs Topping DX3 Pro+

“I have 2 KA13s with problems. One just outright died on itself. The other had a ton of distortion when plugged into a mobile phone”

“I bought the Topping DX3 Pro+ last week and within 24hours is just died, stopped detecting any input source so I returned it to Amazon disheartened. I really loved the sound but immediately noticed some quirks which should not have been quirks like not being able to change volume display between % and dB, or the fact that the lowest display brightness differs between both MX and DX which bothered me. The Custom menu on the DX also has limited options compared to the MX3s, why? No reason for it! So someone recommended the Fiio K7, more powerful, balanced output, no display or faff, no remote, just a big dial and loads of power. I love the headphones out of the MX3s, but it's obvious the HD650s want more power than what the 100mW x2 @ 300 ohm MX puts out, I have to put the MX at -2dB to match the loudness of the K7's dial at 3 o'clock and that's just with the 6.35mm output which is 140mW @ 300 ohms. Had the 650s since 2014 and finally now getting the most out of them, balanced and 540mW 😎”