This question made my brain hurt so I had to make a video to explain it to myself. The answer is NO for the common subwoofers we encounter in the field that are closed in the back and have ports in the front. The answer would be YES if the sub were open in the back, but then the coverage pattern would be a figure-8, not omni. Why do you polarity invert the rear sub in a cardioid array?Phase WheelFIGURE 4.12 Summation zones from Sound Systems: Design and Optimization by Bob … [Read more...]