HandsFreeLink Has Lots of Background Noise

I'm so enjoying my (almost new) 2014 TSX Sport Wagon, but my first few phone calls have resulted in both callers commenting that though they can understand me, there's lots of background noise. I've made sure the heat blowers aren't getting in the way of the microphone (though the heat hasn't been on "high" during these calls anyway).

Is this a known problem? Does it have a known solution... or just a problem with HFL?