I have tried Sylvania's and they have a sound that tends towards a warmer signature with OK highs.  I have also tried the JJ's.  I didn't much care for them, just kind of a flat sound.  Didn't really seem to highlight or excel at anything, which if it was a neutral and balanced would be OK, but...

Greetings,   Long time hi-fi nut, but just getting started into higher resolution/digital portable audio.     Have an older iPod with 30 pin (non-touch), and Samsung S5.  I was going to pick up a Fiio E17, then saw the E18 will work with Android also using the USB OTG as opposed to just...