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After listening then measuring I found the problem.One driver on an open baffle(30"by 30" off set one inche from center in both plains)is flat from 200Hz to 5kHz.But add another the two are only good from 200Hz to 2kHz then they take a 15db dip from 2kHz to 5kHz then they come backup and go to like 9kHz.So the conclusion is if you use 2 you can only use them to 2kHz.they also measured less efficient (95db) not 100 all 4 measured the same.Regards Tim