Steve, if you get the EP350, the sub low-pass filter(it's not a full crossover; it just rolls off the sub above the selected frequency)should be set at 150 to get it as far as possible out of the way of the full crossover(e.g., at 80Hz)that the receiver is doing. The speakers will then be rolled off under 80Hz and the sub will be rolled off above 80Hz(getting the under 80Hz sound from the speakers set "Small").

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Enjoy the music, not the equipment.