Really? Even your laptop struggles? I only have to turn them up to 25% or 40% if its a quiet song when running off my laptop. Although it is a Dell XPS so maybe it just has a more powerful output, who knows. Also i think they only sound different when run through my laptop coz of the equaliser i have set on itunes. Thats one thing i dont like about iphone is that you cant have a custom equaliser, only the standerd ones. I usually just use it with no equaliser, it still sounds pretty decent.
Does anyone know what the input power of the HD 448's is? Ive seen a huge range of different power inputs for other brands from 50mW all the way up to 2000mW