I have a Harmon Kardon avr-354 but I cannot mount an external center speaker so I have to use TV's center speaker. I also have 4 other speakers mounted in ceiling. As soon as I raise the TV volume on Samsung LCD the sound in room sounds echooee. I think the TV has DVI audion input. Can I use the avr-354 center speaker output to connect to TV's only audio input which I think is the DVI audio input. Will the AVr-354 recognize the Tvs internal speaker as a center speaker in a 5.1 system and allow me to use their EZ calibration for room setup. If not how do I balance TV internal audio speakers with the other external 4 speakers.
I don't believe there is a reliable way to do what you want. The "echo" you hear is actually going to be a timing issue where your 4 speakers are playing a split second different than your TV. If your HK has it..you might be able to adjust the delay in your audio signal and see if that helps.