Those settings will not really help.
Flat screen televisions have HORRIBLE sound.
Imagine this:
Take an ordinary speaker in your room.
Turn it to face backwards or downwards or to the side.
Then put a large piece of rigid plastic between you and the speaker.
How do you think this will sound compared to the speaker simply facing towards you? Horrible right?
Your HDTV has the speakers on the back, facing up/down/sideways.
This is why your sound is so horrible.
You need to look into a soundbar that is 5.0 or 5.1 (with a small external subwoofer). This will give you a long speaker that faces forward. Even if it is a cheap Vizio or Sony unit - just facing the speakers towards you will be a drastic improvement in sound quality.
Adjusting the Equalizer settings really wont compensate for "Speakers on the back side" problem.
If you want to try: 100 hz is the low frequency/Bass.
300 & 1 khz are probably the treble.