craigb
I think he meant, what do I need to play Quadrophonic recordings on. 
Your HEAD! And some imagination! But the "reality" of it, is quite different and the experience creates a completely different feeling about the music. There is "more to it" than otherwise, and this is the part that radio and advertising makes you believe is there, and all of a sudden, there is something else ... and it adds to the strength of the work.
Sadly, most of this will die like radio ... a forgotten nothing ... meaningless to most people that do not recognize the truth in words. I'm not allowed to copy/share that work.
My best example for all this goes back to the Beatles and PF's DSOTM ... the English import was not a copy, as the American pressing of the LP was ... and the quality suffered. So when all these re-bs-masters came around, you got something that sounded just like the original pressings in England ... and there was nothing new in them! Steven Wilson, may have cleaned up King Crimson, but the effect was that the saxophone got moved back away from the front, and another instrument is closer to you, like Robert's guitar ... and to me ... that's crap! The simple moving of the instruments does not make the orchestra better ... it will change the accent for a moment or two because of the inter-mechanics, but in the end ... the whole piece is the same ... nothing new under the sun!
For this reason ALONE, a lot of these "new" processes, were best used for NEW music, and things like Tangerine Dream and Klaus Schulze were ready made for those things. They go around and around and create completely different feelings and ideas that "lyrics" can't give you ... but it's hard to discuss this when all we talk about is rock'n'roll, and not the rest.