Asia, any speaker set "small" is rolled off below the selected crossover frequency and those frequencies are then handled mainly by the sub. Assuming that you have a good sub, the VP150 and all your other speakers, including the mains, should be set small, with a crossover frequency of probably 80Hz. This allows the sub to handle the frequencies that it does best(if it's a good one)and allows the speakers to play more cleanly where they do best higher up in frequency.

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Enjoy the music, not the equipment.