I have been using custom moulded ear pieces with sound input for a number of years. At the moment I use it with an autocom system (zumo 660, mobile phone, CB radio, can do music) and plan to use them with the Sena SM10 using the helmet bracket that the ear pieces plug into. The connection to the Trophy will be bluetooth. I did not see the point of having ear plugs then having to crank up the helmet speakers to hear anything. The ear pieces allow good sound quality at any speed with the lowest possible sound setting. Balancing all the audio inputs to a single sound level is the trickiest bit.