The inexpensive foam ear plugs work very well for me. Through them, I can hear my in-helmet speakers (cranked up to max volume) well enough. That really simplifies my audio setup, since it's just the in-helmet bluetooth headset connected to my smartphone.
With earplugs, it is just as important to fill the ear canal as much as practically possible. Just blocking sound pressure from entering isn't enough. If the ear canal has dead air space, any vibration that gets transmitted through your soft tissue and facial bone will induce a standing wave in that air cavity and causes a booming noise. The soft foam earplugs take care of this quite well by filling the ear canal as well as providing a good outer seal. Audio earbuds, OTOH, needs some air space for them to work properly.
Sometimes the simplest solution is the best solution.
2014 K1600GT Sport
Last edited by Volfy; 05-01-2019 at 10:37 AM.