I've never found anything I can understand at highway speeds on any bike. I have custom molded earphones and the noise always overcomes the audio. I do have a hearing disability and it shows up mostly as auditory perception, which means I can't hear speech when there is other sound. I can't understand speakers at drive-up windows, gymnasiums, most PA systems, lyrics to songs, or movies. I can't hear birds, crickets, or microwave beepers. My "word recognition" is down to about 50%. My audiogram, which indicates a profound high frequency hearing loss, is basically unchanged for about the last 50 years. So the recent decline in speech recognition is more in my brain than ears. Simply stated, my brain has not heard those high frequencies for so long it no longer knows what they are.
So, for you folks who can discriminate between the various motorcycle audio systems, be appreciative. On the positive side, at least I don't have to worry about putting on one more thing and getting it connected to the right thing. I have all I can do to remember my gloves and sunglasses. OH, where's my motorcycle key????