It should be noted that most of the noise dampening comes from the seal of the actual ear cups… if I put them on properly, they do a damned good job of blocking out the surrounding world (sometimes to the extent of a headache, if I don’t have anything playing through them).
They don’t really like being paired to a load of devices… they can get quite confused easily, I’ve noticed. Maybe doing a bluetooth pairing reset might help with this (hold the power slider to the Bluetooth pairing position for 5 seconds until the headphones say ‘Bluetooth devices cleared’ or something like that).