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Thomas, I'm sorry if my first reply to your comments was defensive in tone. I think I was in "Don't say my kid is ugly" mode. Since you have built multi-woofer systems before, I am interested in hearing your experiences. You mention using 15" drivers in 18" X 24" X 20" boxes. That's about...

Are you speaking from experience here? Have you used 4 drivers in a room? Have you used the 15" Quatro before? If so, I bow to your experience. If not, I will consider this to be your opinion, and await other, perhaps more informed comments. A 15" cone moving 5mm will cause the same SPL...

Brad, One of the design criteria was to maximise cone area and reduce necessary stroke for a given SPL, thus four 15" drivers. Even 1000 watts won't drive four Quatro's to their excursion limits in a sealed box this size, and 121 dBA should be more than I (and certainly my wife and neighbors)...

I thought that might get your attention. I've been daydreaming about a possible project and would like some feedback from Those More Knowledgeable Than I (not a real exclusive group....). I've been trying to come up with a way to 1.) Build a sub with lots of cone area for good "Slam...