Have you checked the volume control on your phone while the music is actually playing on the bike via blue-tooth? The music volume is usually different from the regular phone volume (same button, but the internal control is different from the phone volume), which would also explain why your "knock" sound plays loudly on the bike. I can connect my Samsung S4 via blue-tooth to the bike, and I think it sounds even better than the USB that is directly connected.
2015 Road Glide Special
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Last edited by caberto; 06-04-2015 at 02:36 PM.