I have completed the construction of a pair of 2245 18" subwoofers to compliment my Linkwitz Labs LX521's. This is a active 5 way system using a MiniDSP 4x10hd and two ATI 1506 amps. Each driver in the whole system has it's own 150W amp with the subs working from 35hz down. I borrowed the design from Greg Timbers 1983 design. I have slightly curved sides but otherwise there is no deviation from their design. These are amazing at what I ask them to do. I have them equalized +10db at 17z. These blend fabulously with the pair of open baffle 10" drivers in the LX521's, which is no easy task. For those of you that haven't heard open baffle woofers, you're missing half of life. These are an fantastic addition to the LX521's for any kind of program material with sub 35hz signal. The 10" woofers below about 35hz have dramatic cone excursion which is fine, but to me it sounds as if they are struggling to reproduce these frequencies. The JBL's on the other hand are smooth and very comfortable keeping up with the main system.
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