Yamaha 5.1-Ch. Surround Sound Home Theater Speaker System "hard hear voices" Questions

...circuit.if the bulb lights up it means it's ok and if not, your cord is open. can hardly hear the voices when watching a movie. the surround sounds great just can't hear the voices, it's very

...any kind. low volume is cool but increase it and it make a loud rattling noise...woofer pumps very hard...and no controls can stop it: you have to power it off. whats going on? and how do i take it ...

...hard to hear announcers). When I shut off centre from recevier I get proper voices on other 2 front speakers. Who know what teenagers did to it. Any idea what is causing this? Any quick fix or do I ...