I've decided to build the 4344 recently detailed in the DIY forum. I will use these in a tri-amped system. For this reason the only passive x-over I'll need in the speakers will be for the 2123 and the 2425. I have the 2123Hs and am looking to acquire the 2425Js. Can someone help me with a suitable x-over design for these two drivers. Using my Ashly x-over I can set the low freq x-over at 200hz and the hi-freq x-over at 8K hz. Don