yeah, I'm pretty sure... had exactly the same issue on the N9 were quality was tremendously improved with the sec mic off. Maybe it's a problem with my voice specifically, but whatever the exact reason I'd like to turn it off to verify

btw, is it normal that in CSD tool the recordings from the sec mic are extremely quiet? No matter how loudly or closely I speak into it, I have to hold my Jolla to my ear in a quiet room to hear it playing back...