Hi everybody! I have been running a pair of Eminence Alpha 15a, 15" woofers, in 24"x24"x7" U-frames for my bass speakers and have been generally happy with the sound. I use a Reckhorn B-1 as the crossover and bass boost for the woofers. Recently, the left woofer has been making some nasty sounds when I put on bass heavy music and play it a little loud. ( For me, loud is 90 db or so. I don't listen at what many people consider high levels.) My current bass amp is a Citation 5 tube amp, 30-40 watts a channel, give or take, which replaced a 60 watt/channel chip amp. I am thinking of trying different woofers in the U-frames, and looked at the Eminence Beta 15a as replacements. Anyone tried both? Is the Beta-15a better, worse, or about the same in open baffle? Any other woofers I should look at in the +/- $100 each price range?