Update on Autocom Super Pro AVi for Schuberth C2
With not too many calls to Autocom for tech info, I managed to install the speakers and microphone in the the helmet. The iPod worked perfectly from the start, but the Garmin 2720 wouldn't output voice to the helmet. Apparently there is some sort of conflict between the Autocom and the 2720 when they are both powered from the bike's battery. The Garmin would be perfectly clear and audible when powered from a separate battery and outputting through the Autocom. The solution was to use part #1282 from Autocom. It's an isolator that accepts two inputs of the 3.5mm stereo variety. The Garmin is perfectly clear now.
I have to mention the BGNS (background noise sensor) and how well it works. My old intercom, in the Shoei X-9, (that tells you how old!) was from J&M and worked pretty well for all this time, but can't compare with the Pro AVi. I have the BGNS just sticking out below the helmet in the very back, and as speed increases, so does the volume from the speakers. Very nice, and the GPS does the same as the music fades 50% while the GPS gives its instructions. I will experiment with the placement though, because if I turn my head the wind noise is increased at the BGNS and the volume rises considerably. Maybe if I place it to the side of the helmet, the noise level for it would be more constant and give me a more consistent output level even with some head swiveling.
A big thumbs up to the Schuberth helmet too! I was wearing earplugs with the Shoei most of the time, and now without them the C2 is quieter! Very comfortable, and neutral with no head buffeting in the clean air off the K1200S windscreen.