the amp has a small noise floor a expected , it's ok for headphone like the lcd-3 and less sensitve headphones. most dynamic headphones are too senstive for it. i use the amp with a ifi iesl pro for my electrostatic headphones or the lcd-3. i made a voltage divider adapter out of curiosity and so i can use it with my dynamics headphone without any noise. for most headphones the dynalo would be the smarter and better choise to build.