I'm not sure. I thought since I'm able to hear conversations clearly and since other audio features function normally (ringer, notifications, etc) I did not give the speaker a second thought. I have set the unit to factory condition and reinstalled the 4.2 OS, but the problem persists. It seems, though, that there is no problem with others hearing my conversation when the bluetooth feature is activated.
Could it really be the speaker?
Really appreciate your help!