Why do most people have a crossover around 80hz and below then. Is it due to limitations of the sub above 80hz.Under 400Hz waves are "omnidirectional" - no matter if radiated from satellites, or subwoofer.
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Or there being a time delay between the sub and mains at the listening position.
If it is 400hz, then it would make sense to crossover much higher to relieve the mains woofer of low frequency duties.