Thanks for the awesome review. I love frequency response charts.
This is my first portable headphone amp, so please forgive stupid questions. But, is there any problem just setting the E5 to max volume and leaving it there?
I ask, because it seems to sound ok, and then I can control the volume via the source. OTOH, I would never dream of using a home stereo amp at max volume, I never push my home amp past 50% for fear of clipping and speaker damage.