Forgive me for asking but this is a long thread that I want to dive into but I really can't wait to ask. Everyone talks about how great the 650's respond to upgrades and I am into that. But for travel, how will they sound with a modest amp such as the JDS o2?
I think you 650 lovers have convinced me to jump in!
Don't know the JDS o2, but I used to use mine with a Sony Bean portable mp3 player, and I thought it sounded good enough. It doesn't take much to get good volume out of it.