Go to one of the online room mode calculators, and put in your room dimensions. The calculator display will show where in the room are located all the room’s modes (areas where standing waves accumulate). Position your speakers (and subs), as much as possible, NOT in those high pressure zones. Then deal with speaker placement in terms of other considerations (imaging etc.).
What measurements from the rear wall?
Am looking for general measurements from my back wall. It seems that 3 feet from the back wall is pretty well accepted as the starting point.The question is where the measurement occurs: is it 3 feet from the rear of the speaker or the front? My speakers are Axiom M60s and are 14.5 inches front to back with rear firing ports. Do the ports figure in the distance to the wall? Fire away!