well if you look well at my message i said dead center of you lisning area... and by this i meant where you sit but in the center not to the right or to the left but at the center of the couch right between the the 2 front mains... i have done extensive testing and if the position the spl meter (level of your head and exactly center in lie with the seakers ) is not perfect than the sound will not be well calabrated .... i use a tripod on my leather couch!! wife non approved... but anyways this works for me !!!

7.1.4 * MRX1120 * M100s * 180HP * 4x M3-on walls * 4x M3-IC * dual XV15se * Shakers