Pablo,
I have had my TV for about 2 years and I have never used the internal amplifier yet. I love to hear regular television shows in PLII. It is cool to hear the laugh track in the rears. I also like watching football games where you can hear the stadium announcer over the rears as well as the crowd noise. Turn off the amp and the stadium announcer is gone. It is much more lifelike. Also it doesn't have to be loud. Just turn it down. That is just my opinion. Anyway a possible solution is to run all of the outputs of your various components to your TV directly and then use the TV's output to feed the receiver. That is what I do. I do it this way becasue I just don't like the idea of more connections between my source and TV. Just a personal preference.