I acquired this supplement helmet PortaPro I have for over 2 years. I expected to have the same headset to the hoop close. In fact, musically, the SportaPro it is much lower. The sound is less powerful, less clear, less detailed, more muffled. A piece of exception Dream as we listened to Aerosmith to PortaPro becomes tasteless on SportaPro. Although I have tested alternately on the two helmets 2'40 sequence. -> 3'15 for 30 minutes, the conclusion is clear, the PortaPro is well ahead. I will SportaPro me to see movies on the tablet, the PortaPro for listening to music.
