pearlanddude

I've got the 7100 NEX, 2014 Mazda 6 with Bose....callers hear echos of their voice. Have tried everything...volume levels, different mic, different mic locations, steering wheel adapters, etc etc. Still have callers complaining about the echo. This is the most expensive HU we have in our 3 cars and the only one that has this problem.... Any ideas?