120L tuned to 42Hz with a slight rise through 50-60 . I'll use the Behringer FBQ 3120 "sub out" at about 80-120 hz for a start, see what happens I guess !! Shouldn't cause too much problem for the Jaycars, I hope ! If I blow them up, I sould be able to replace them with either a kappa pro15 or a magnum 15ho.. they all model in boxes that are reasonably similar !