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I once answered the phone through the headset and told the caller I couldn't talk right now because I was riding 65 on the freeway. The caller called me a liar.
As far as stereo goes -- I find that to be a drawback on account of I only got one ear. Nothing is more annoying than these systems that insist on piping through separate channels and don't give you balance or individual volume controls that you can manage on a bike, on-the-fly. I never get to hear a complete song. Why do I mention that? Any of the helmet switches that attach to the outside of the helmet change the wind noise to your ears. If you get one side washed out, you don't hear the full song, either. Ever listen to just the bass part of the long version of "Light my Fire?"
I'd not put them both in one side for a couple of reasons: There is a mic in each speaker. The noise cancellation feature chooses the one with the better signal-to-noise ratio. If they're both on the same side the transmitted quality would be affected. The other reason is the size of the speakers and their shape. Even if I could fit both into one side it would be impossible to get the little snouts with the mics into a useful position.
I'm torn between the Nolan 104, Schuberth C3, and the new Sena Momentum INC (Intelligent Noise Control).The only negative I've heard about the Sena is the visor doesn't stay open part way, no ratchet or friction. I've been a long time Arai customer and I like their quality. Opinions?https://www.sena.com/product/noise-control-helmet/
...and I read about those mics too. Good point! Perhaps you can swap them? Left for Right? At least you might get the more interesting part of the music. If the leads are different lengths, you might be able to swap their connections. Giving up, and just riding works pretty good too.