30 minutes ago, PorkishPig said:
That's where my confusion comes in, the Solo is perfectly audible at 100% and the audio quality is decent AFAIK -- no immediately noticeable distortion. I'm not entirely sure that I am sacrificing audio quality by having the Solo at 100%.
you should be fine if you dont hear any distortion. distortion usually happens when it is loud and at the amps upper limits. having an amp that doesn't drive your headphones ;oudly and with a bit of headroom you are sacrificing abit of your headphon'es true potential cause an amp that has reliable clean power can do a decent amount to a headphone to bring out it's true potential. the akg k7xx isn't exact;y a headphone that really requires an amp to reach it's true potential but Im sure you yourself will benefit more by having more volume available to you as it seems quite regardless