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Hi Wayne I built a set of 3 pi mains a couple of years ago now and used the upgraded drivers and your horn flares. They are the best speakers I've owned and continue to impress. I am currently running them full range with 2 15" sealed box subs. The sub drivers are nothing fancy, Dayton series 1, stamped steel frame 8mm xmax. I initially had 2 drivers in one box but split it in 2 and get better sound with the 2 subs. It also made them light enough to move around. My room is difficult for bass. It's 20 x13 and 8 ft high. I'd like to go with 4 smallish subs to even out the response at the listening position. I would like a look at the 3 pi sub plans. The lab 12 seems to be a well made driver and I am considering a small sealed box or maybe a ported design like the Pi 3 sub. With 4 12" drivers even a sealed box would have plenty of output for my room, although it would require EQ which is not a problem. My current subs are EQ'd with a home brewed circuit that works like the Linkwitz transform and this does a good job of bringing the bottom octave up. Thanks Brian