Hi, I'm looking for a little help with regards to my speaker location on my new set-up. I have taken Grooves floating wall and decided to insert it into my living room to show off my new panny 50PZ81B. My amp Denon AVR-3802 (although gathering the years) and speakers Kef KHT1005 (although not high end) still give me all I need and then some so I will be using these in my set-up. First question, given my seating position from the rear wall, is it worth adding some in-wall speakers to the rear to use the 7.1 output or should I save the money and stick to 5.1 (would it even work)? Second question, what is the best distance apart for front speakers (I will be 9ft from the screen)? Third question, best height and location for my surrounds (base of Plasma is at seating eye level = 33" high)? Forth, I know sub position is not mega important but any recomendations would be welcome...... 1 point to note is that the sofa to the side will not need to be considered. Thanks in advance Here are a few quick Google sketch-ups to help with my questions.