Originally Posted by 4DHD
Originally Posted by buton
How far apart from the tv the lcr speakers should be?
If you are setting up along the 18ft wall, then 8 ft, L/R center/center. That provides a good soundstage leaving about 5 ft to the sides. Which is what I had in a room of similar width.
That sounds good to me--just about perfect, in fact, once all of the factors are considered (as they will be below). To make sure it's clear, that's 8' apart for the left & right, measured from the centerline of one speaker to the centerline of the other. The center speaker should be right between them in the very middle, of course, and oriented vertically like the left & right speakers if possible. Work around the internal structure of the wall as best you can--nothing has to be all that precise.
Originally Posted by 4DHD
If you do go with the JBL P941, you either use one of those for a center, or a horizontal center.
Depends on the size of your screen and how high you have it placed. JBL does have in-wall centers, but a vertical speaker is still best.
To elaborate without going into too much detail, a vertically-oriented speaker changes in sound very little as you move to its sides horizontally (the same is usually not true in the vertical direction), which is good for viewers who are sitting on either side of the very center, and is precisely why speakers are typically vertically-oriented. The same principle holds true for the center speaker, and in general it is imperative that movie dialogue, the vast majority of which is reproduced by the center speaker, be as readily intelligible as possible. Many people have to compromise with a horizontally-oriented center speaker for various reasons, and it can work alright and is better than using no center speaker at all, but it would still be even better to use a vertically-oriented center if you can. If you can't, however, then don't worry about it--it's an optimization for sound quality, but plenty of people manage fine without it.
Now, as for the distance from the primary seats to the screen, with regard to speaker placement, somewhere around 9.5' (measured from the front wall to the ears of the viewers) is where you would get a nice 45 degree spread between the left & right front speakers, which is considered by many to be ideal for home theater. As luck would have it, this would be just about the right distance from the back walls to justify the use of back surrounds, and would also place the side surrounds at a nice angle, somewhere around 15 degrees behind and to the sides, so this distance would be my recommendation. Feel free to experiment and do whatever you think sounds (or looks, in terms of viewing the screen) best to you, though (it's your home theater)--I'm just describing the "proper" way to set things up in order to come as close as possible to how movie soundtracks are intended to be experienced, that's all.