I'm using a Sony ZX2 with the output bumped up via the sound enhancement disabling trick. It provides healthy drive and power this way... But the sound is just too dark. And I've never heard the ZX2 sound dark with any other phone. FWIW it's also dark in the same way out of several laptops we have. (Two Macs and a PC).
12/23/15 at 7:18pm