The bike stereo sounds great with a 3/4 or 1/2 helmet. When I use the full face/modular helmet I use the Bluetooth. I also use the Bluetooth for GPS with all my helmets along with the bike stereo at the same time when traveling cross country.

This stereo thing on the bike is always making me crazy. I thought I was happy with all the options available short of the 2nd amp, rear speakers, and sub until my Sena SMH-10 stopped working this morning. Now I am obsessed again I have 2 trips comming up in October. St Louis to Denver / then St Louis to Panama City Beach.

I can play the bike Bluetooth Sena / I can play the Android cell phone Bluetooth to the bike / I can play the cell phone to the Sena Bluetooth / I have the JBL speaker upgrade / I have Kuryakyn USB charger on handlebars / I have the phone mounted on the handlebars.
Steve