You bring up a very good point and I've been wanting to discuss this...if some cannot can tell the difference between an MP3 and WAV, and some cant' tell the difference between CD and SACD or DVD-A, then will we be able to hear a difference between DD and DD HD?
And to go one step further, some think you won't be able to see any real difference between 720P and 1080P so why bother with all this new technology anyway? Does a Denon 5805 in stereo mode sound any better than a Pioneer SX-1250 that's 30 years old?
Do we really need a new format that sounds better, or so it appears on paper, than what we already have? Is it just marketing to sell us more equipment or will it really make a difference in our home audio and video experience over what we already have?
OK lets go at it!