Regarding the open-back vs. closed-back models: I'm rather intrigued by the descriptions of the open-back soundstage, but exactly how much sound leak is there with the former? I ask because I tend to use my headset only at night when I don't want to awaken my parents downstairs by blasting audio through the speakers, so if there would be a noticeable level of noise even outside my room, these won't be an option. And as for the closed-back, what options do I have if I don't want the mic? Would it be active if I play online or just if I plugged the set into a phone, say; and if the former, could I just substitute the cable with any old 3.5mm cord without a degradation in sound quality?
Cheers!