I have never listened to the BT music feed from the K. It's reputation is beyond poor. It's trash is my understanding. I have wired in-ear monitors I use that can be fed from my Cardo BT helmet receiver, but I typically just plug it into my phone which is mounted between the handlebars. For wireless listening, the Cardo speakers in my helmet work well. Best of luck finding what's best for you.
I run a Cardo PTB with Bose noise canceling ear buds. I clip the battery pack inside my jacket and use a cable extension to my helmet. It seems to do well. I need to do a long ride to test having buds in my ears for long periods of time. This setup allows me to use Nav, Music, and still use intercom while the noise canceling works well.
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