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Incidentally, while I use a sub with my EXs, I listen to the Sierra LXs without a sub and I actually have to EQ the response around 50Hz down because of bad room mode at that frequency. I also didn't need to do that with the EXs. The Sierra LX is the first bookshelf I've ever heard that really feels like a full-range speaker. The EX is a great speaker but it simply does not dig as deep. If you're opposed to a sub I think the LX is the superior speaker.
FWIW...with my LX's in my room, I get good response to the low 30's hz.