Board electronics side and the primary function of the helmet anyway, nothing to say. The bass is deep (almost too much!) And unlike its little brother, no need to push it fully to cover the noise. Instead, I use 60% power and it is already strong.
Another very useful feature, since the ability to drive headphones choosing music. Again, Mac and iPhone, the two devices we use in everyday life, the recognition of the function is immediate, zero configuration.
I have not tested the wired audio input whose helmet is equipped. Probably a good idea, but at the same time, all my sources are bluetooth .. one day maybe? An excellent helmet so decidedly waiting (I listen to my MP3 by making this comment) the bass is very (too) good! Really deep!