So got the K5 Pro to compare against the Sabaj A10h to see which one was better with the he400se. It was my intention to replace the A10h as I felt it was nice sounding, but lacked the power for the 400se.
I'll need to give my ears some adjusting to the FIIO before giving my verdict, but I do prefer it to the the A10h. It is slightly more powerful, but the main difference is I think it pairs better with the 400se sonically as it's slightly airier, thinner and a touch brighter. This helps bring out detail and soundstage in these cans.
Where it really improves is in the gain increases. On the the 10h the low setting is pretty useless for most headphones and power hungry IEMs, whereas the basic setting on the FIIO is very good. On highest gain the FIIO is slightly louder at full gain (still not comfortably listenable like the A10h), but the volume from 0-100% increases more accurately, in the A10h there is a big step up quite high on volume.
BUT the A10h is a fuller sound. It is smoother and a lot nicer with vocals. They're also a little more weighty in the sound. Sooo, they're actually a nice companion set with the k5 pro. I think I'll keep both .
When I hooked them both to my SMSL Sanskrit 10th ii to compare, there was a noticeable difference in sound from my 400se when I used Composite In (from my TV), than when in USB mode (from my PC)? Is this normal?
Even tho both are very silent, the k5 pro has this ever so low electrical, buzzing sound which I hear when no music is playing. This buzzing goes away when I touch the housing. From reading it sounds like something to do with 'grounding'?? The two plug sockets in the wall are pretty heavily used (TV, Xbox, SMSL DAC, laptop, and charges devices from the USB slots). I connected the FIIO into its own socket on the wall but made no difference. Is there a fix?