It was 2 track PCM on the LD. I will check it out to see how the LD does with DTS-X decoding in a little bit.
Update: I checked it out, and it seems to help the sound field some, but the mix is still pretty heavily biased toward the center channel.
Of course, the LD was released many years...
Yes, it's quite good. By 1952, magnetic recording technologies were in common use, so the frequency response is fairly wide with good dynamic range and low distortion.