Can anyone give details on some multi-channel thoughts/purpose?


What are the advantages of 5:1, 7:1, 9:2 as far as being like a live music performance  or are they of more use with movies?


whatjd
Please read my system thread Home Theater Done Right, and check out my system https://systems.audiogon.com/systems/8367

It took a good full year, actually probably more like two full years, going around auditioning all the options for everything home theater and stereo. What began as a lifelong dream of a dedicated listening room and system became, by the time the room was actually built a dream of having the ultimate Home Theater for movies and music. It was very hard being told by so many the correct way to do HT, only to learn by actual listening experience that it just ain’t so.

For two full years all the reviews were read, and then components tracked down and auditioned. Sometimes even bought or shipped and auditioned. Look at my system. Read the description. Read the most recent comment. Just yesterday the better part of the day was spent carefully removing the drivers from the Talon speakers to replace the gaskets with fO.q tape, paste magnets with FC and other tweaks.

The System of course was not always like this. This today is nearly 30 years effort. It was much more modest in the beginning. In spite of what is there today this is one very tight with the money audiophile. If it was in any way shape or form possible to do well in terms of sound quality with anything else, boom, done! Don’t care what no one thinks. Don’t care what no one else says. Only care what it sounds like.

And what it sounds like to me is the very best Home Theater and the very best stereo are one and the same. The only difference is for HT the speakers, equipment, and screen take a little more thought and planning- but almost entirely in terms of placement and NOT like we are constantly told, in terms of what kind.

Specific to your question, the "advantages" of 5, 7, and 9 are they are able to sell you 5, 7 and 9 times more crap you don’t need. That’s it. All else is noise.
5.1 is the basic minimum unless you have a large room and/or many seating positions.  In those cases, 7.1 is useful.  Beyond that are the immersive systems (Atmos, Auro-3D, DTS:X) which utilize arrays of speakers above the listener's ear plane.