I would like to suggest downloading the owner’s manual for both models. The manufacture will suggest the optimum viewing distance and angle. The link below is for the Hitachi 55HDS69.
...
I like Cherry Red, I suggest you may want to consider one wall only so that the room is not too overpowering. I finish one wall in a room with cherry red. I first started with a tinted base coat followed by 4 coats of red to achieve a...
Brian
My HT room is 20x45, one large room. I have used a variety of lighting options and switches as follows:
1- There are 9 wall sconce lights (40w) in this room. These lights are on a RC dimmer
switch. I dim these lights...
I suggest checking the manual for the projection screen. It should recommend the best viewing distance. This is a good place to start to plan your seating.
Are you planning on keeping it as one large room 14x50, or did you want two...
I had the same concerns when finishing my basement. I looked at different heating option and settled on a gas fireplace. It heats the basement (600 square feet) in about 10 minutes and is also pleasant to look at.