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What do you typically do to avoid that dip you get at 80hz in the response, due to the transition from subs to main?
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See the resultant red line in the picture above? That's the result of the mains and sub adding together when the signal 'leaves the speakers'.... It combines for a flat overall response. There is no dip......
That's in a perfect world. In reality, the phase of the sub and mains signal (as a result of distance apart and time settings on the receiver), sometimes cause an other than perfect addition of the signals. This is rectified by adjusting the phase control of the sub and also the distance setting in the receiver. Use REW sweep up to 200Hz with the sub and mains playing together (with normal crossover settings) and examine the crossover region. Then tweak to get it smooth........
This is why we first take a measure of the sub though the receiver alone and equalize up to about 100Hz. Then add the mains and examine the crossover region and adjust the level of the mains and tweak to get the best transition of the crossover using phase and distance and sometimes a bit of filtering.
brucek