I’m assuming OI affects the BA drivers in the Solaris and not the DD driver. Maybe it’s shelving the upper mid or treble to where you like it? I don’t think I’d describe Sony sound as rough from memory
Given that the Pixel XL has about 4.8 ohm OI, and I don't think Google has really put that much thought into audio since then, maybe the 3A is somewhere in that ballpark? I do prefer Solaris out of higher output impedance devices as well. My AK120 has 3.5 ohm OI, for instance.
Not weird at all. To me, ZX300 tends to make the upper-mid a bit hotter and the bass a tad leaner compared to stuff from Hiby or WM1A or even an iPhone. It's something I've noticed with both Andros and FDX1, a bit worse with the former. For something that has tube-like organic lows, its upper-mid and treble is quite solid-state-like.
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