Couches are not something that you can buy just by recommendation. You will have to sit on a lot of couches to find something that works with your body. It might be that a couch will always have problems with your back. They aren't usually built for back problems or support.
Home theater couch?
Can anyone recommend a family sized couch brand for watching movies that is comfortable and ergonomic? The center of the couch will double as my main listening seat when I’m alone listening to music. A nice solo chair is out of the question. I’ve yet to Find a couch anywhere that has good back support or neck support for extended sessions and doesn’t leave me stiff getting up. Thanks!