Does the Bose Quiet Comfort incorporate a headphone amp? I know they don't work without a battery. I am seriously considering these vice seperate headphone and amp. While I believe I could do better than Bose I am overwhelmed by the numerous choices. My dad has Ultrasone's and they are real...

Does anyone know what is in the Bose in ear headphone circuitry bead that was moved up the wire in version 3 and what it does? I have been listening to the Bose in-ears and am really impressed by their sound. My dad likes the sound too but believe Bose is doing something to the sound via the...