Actually I bought the NC, because I was always satisfied by harman / kardon. Unfortunately, the sound quality compared to the BT model is bad. In normal mode, you have absolutely no bass. Only in NC mode. But not as tired as the BT model. harman / kardon has really strong regressed! Unfortunately, no other manufacturer, this low profile, with which one can sometimes sleeping side. I am really disappointed. For the price an impertinence!