Roku Select Series TV sound issues

I'm confused with the sound on the 41 inch Select Series i Bought last month. I have it mounted on a stand so that I can move it in dfferent positions. I have issues with the quaiity of the sound. Especially vocal and conversational sounds. I discovered that the speaker is mounted on the rear of the set and the sound is just perfect. Please tell me why a manufacturer would install a speaker system that is basically backwards.