To enjoy your BD 100% you really must see the PQ and hear the AQ as they both work hand in hand (or eye and ear in this case). For those of you still not having a home theatre (either in a box or in many boxes) you are missing a large part of the fun. You don't really need a 7.1 system but at least a 5.1 system (or 5.0 for those not into the boom boom bang) to feel the ambience and immerse yourself inside the movie. You need not spend a fortune (unless you have one) and can always start with a basic one. Space should also not be an issue, just look at my setup  in this thread, post #1303 and #1318. This is definitely not an ideal case but good enough for me to enjoy my BD collection.  Just my view. (BTW, this only applies to those BD with good AQ, some are just like in 2.0 only.)