I have a Sena 30K head set and wanted to try upgrading the speakers with the new 50s speakers. I ordered a set of 50s speakers from Sena and it turned out to be a plug and play for the Sena 30k. It worked out real well the new speaker sound much better than the OEM speakers i.e. louder and seem to have more bass in them. How I tested; I had the 30k on an FM station and listen to it for about 20 min. than I installed the 50s speakers and had the same FM station playing, right off I had to turn the volume down just a little was to loud and I could hear some bass sounds in the music that I did not hear before. So if any one was wondering if they can upgrade the speakers in the 30k with 50s speakers the answer is yes. I like the sound of the 50s speakers much better. :thumbup: