What kind of sound system are you using? Is this solely an issue with Netflix?
For what it's worth, in my opinion most TV speakers are designed to be awful because they either point the audio down or backwards and the sound is guaranteed to sound more muddled than the original signal because it's bounced around before it gets to you.
You need forward facing speakers (preferably with a dedicated center audio channel as in a 5 speaker surround sound setup) to get the maximum benefit.