Just finished putting a J&M2003 comm unit on the SO's wee strom and it works great - except.
Below about 60 the comms are great, but above they become garbled. This is with a 05 venture on my end. No electrical noise on either bike. Both units play MP3 fine at high speed, it's just the talking.
We both wear Nolan modular (N-102) helmets and have tried the mics with and without the foam wind socks. My stock windshield is cut down and hers was never full. 90% of wind goes over our heads. Tried with the face shields up 1/2" and down. Down is better, but still garbled.
Is this inherent with full helmets?