I would suggest helmet intercom speakers.
A regular external speaker, unless it has a huge power, will be useless above certain speed.
And careful with headphones / ear buds… here in Europe they're forbidden! You can't use something IN your ear that doesn't allow you listen to the environment properly.
With the helmet intercoms, there is a shady interpretation, as their speakers are not IN your ears, so some judges in Spain consider them external speakers as the ones in a car, and cancel your police ticket, but others don't…
Yes I wrote “judges” as we are in a huge fight of the motorcyclists against the road police regarding these intercoms and many trials regarding those happened recently… I know because I’m planning to add intercoms to our helmets, and knew by biker friends that there is this fight.
But this means you have to wear a helmet...
Last edited by Marmota; 02/11/19 06:24 PM.