It is bad manners at a Western meal to make any noise with the mouth, such as noisily sipping the soup or smacking the lips or the still more unpleasant sound of belching.
In the C30 Electric you get none of that, nor is there really much wind noise to give you any sense of speed. In fact, we didn't really hear any unpleasant sounds until we'd parked the thing.
Previous research found that the painful parts of unpleasant sounds appear to be in the middle range of audible frequencies.
