Just to let anyone know if they were just a bit curious (like I was) on how well does Noise cancelling ear phones work on a motorbike.
Bought a philips SHN060 noise canceling suppression ear buds ($80), and a Sony MDR-NC11a ($140) Noise Canceling Headphones for comparison.
The sony with the stem on the ear bud doesn't fit into the helmet as well as the philips. Also the philips are rated at 40-20,000hz in comparison to sony which are rated 10-22,000, the philips actually sound better. Go figure.
The Sony ones actually sounded better up until 60kph since they were a tighter fit within the helmut but the started to hurt because of the odd shape and size that presses against your ear with the helmut on.
The philips had better bass despite that the package says that they don't go lower then 40hz. Warmer tones, probably because of the lower quality. Better helmut fit because of the size and standard ear bud shape.
Apparently the more money you pay, the crisper the sound, higher the highs etc.
Bottom line on both noise canceling headphones will work up until 60kph then once you are on the highway, wind noise, engine noise makes both headphones sound like tin cans.
I am taking them back as they may be good for airplane rides, but definitely not for biking. At low idling of the bike, the music is bassy and clear, but once you start riding, the engine and wind dominates. Not worth the price of the headphones.