installed a sony mex-n5000bt in my truck about a month ago, everything is fine except when i call people they say i sound like im in a alley, or a echo. im using the mic that came with the stereo and have tried different locations to put it. first above the rear view mirror and now to the right on my iphone, which a little to the right on my dash. is it the mic, do they make a better mic or it this just the way it will sound.