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Given EP500's sharp fall off of frequency-response at 100 Hz, setting the crossover in my receiver at 120 Hz would cause me to loose everything between 100 and 120 Hz. Is that correct? If this is the case then I would think one is limited to setting the receiver crossover to 80 Hz or less.



Theoretically, you would lose everything (you'd be down about 96% which is pretty close to everything). But you may have a peak in your room acoustics as well that may compensate for this loss.

You could set your receiver cross-over to 100Hz instead of 80 Hz.

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Also, what is the difference between setting the EP500's crossover to 100 Hz or to bypass? The EP500 stops everything above 100 Hz. I don't see what you would gain with the bypass setting.



There's no discernable difference if your room is acoustically large for a frequency of 120 Hz (greater than 10'x10'x10'). If your room is smaller however, the frequencies above 100Hz, although attenuated by the natural response of the EP500, would get amplified by the response of the room. I think the same effect would take place if you had a wall within 10' or less of the listening position.