The VP150 is -3dB down at 85 Hz and the typical crossover for the subwoofer is at 80 Hz

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It's interesting. If you look at Axiom's own graph for VP150 it looks like it's -3 dB down at fc=100Hz rather than at stated 85Hz. I wonder if Alan can comment on that.

In addition , some recommend to cross at frequency about twice fc to get a smooth transition to sub. Overall, I would think that the sound quality will be sacrificed by not going to towers.