ventilation is a big factor for the amp,if possible put heavy components on the bottom for stability.i'm not sure about conditioner placement,but convenience is a factor:don't put the dvd on the bottom then you have to bend down to change dvds,same for cd,vcr,etc.also if cable length is a factor the central positioning of the 950 may be necessary(i have 2 pairs of 1/2 meter,so i arranged accordingly)