The home theatre chairs available are worth looking into as they are built for long term use, support and adjustability - a bad back can be assuaged by a half hour spent in a reclined position.
My speakers require rather anal set up using a laser so my HT recliner is set up with index marks so I can get it back into original position if I move it inadvertently.
A theatre seat that seems comfortable in the store for 5 minutes may not be for several hours, but it can be hard to buy one with an option to return it after, say, a week if it doesn't please.