I have a lot of sources, iPhones, iPods (5th gen video, supposedly the best), CD players... but I was taken totally by surprise a week ago when I decided to plug my Sennheiser Momentums into my Dell Latitude E6410 laptop. I had never really played music from it before, I have so many portables and stereos, I usually work on the laptop and get music elsewhere, but I broke the headphone jack on my iPhone, so I thought I'd try plugging into my laptop for the first time. I was playing back lossless and HQ MP3s through Foobar and the headphone jack and thought to myself over a couple days: "Damn, why is this sounding so good?" It piqued my curiosity enough that I plugged into some other sources, and then came back to the laptop and I'll be damned if the sound didn't have more depth, power, space... what the hell? Are you telling me a laptop has better output than my treasure vintage ipod? Well, it does! It's now my favorite source to listen to music for quality. Very weird.