inputs.text: excellent happy w sound - recently purchased unit much research unit good 3 audio systems home zeppelin air 2 used expensive equipments including emm labs main system listen different music including large orchestral music requires neutral resolving systems quite impressed sound quality ap100 used high end sound must say quite impressed ap100 good enough listen beethoven symphonies says lot great separation dynamics wide range frequencies deep clear bass extended highs clean smooth sound not good main system close 25k good enough listen extended period time good price