U use the DAP with Solaris and Headphone ???
just suggestion (affordable DAP that manage HISS to Solaris)
- CAYIN N5iis (must go balanced). 2nd hand, What I know no New Product. Good manage HISS. Neutral to Warm.
- Shanling M3s (neutral to bright), waterfall HISS, PLASTIC Body....
- Shanling M5s (a bit bright). waterfall HISS
- SONY ZX300, this baby WARM....
All above handle better HISS then FIIO DAP. IMHO.
If you have Android SMARTPhone from S@msung or use CIRRUS DAC, install UAPP. should serve you well...
If you really must Neutral sound sig, get A&K DAP, hmm.. 2nd hand, Futura or KANN will do... Almost zero HISS with SOLARIS, wide soundstage & FLAT ....
edit: u used DX150 right ? get AMP1Mk2... that can be optional. Changing SE to TRRS will pick up a bit Hiss, but it worthy with the additional MID/Vocal detail... IMHO