Frankee, as I mentioned in my reply above to Lee, pipe organ is an area where the sub is really a major factor. Since you specifically mention that, I'd suggest that you might consider a more powerful sub with more extension than the EP175. If your budget doesn't permit going higher up in the Axiom selections, there are other possibilities, such as the excellent Hsu unit that Lee mentions, that would fit your needs.

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Enjoy the music, not the equipment.