I see, thank for explaining. Yes if you have the option to receive more than 2 channels then I can see how that would give some flexibility. I didn’t realize that TV channels offer 5.1 (I don’t own a TV set).

Saying that if you are receiving a stereo signal - which I expect is the default option - then adding another speaker or changing the amp won’t make any difference, right? Or is there some amp processing technique that improves even a stereo signal?