What electronic subwoofer x-over?


Anyone have recommendations of good electronic subwoofer x-overs to mate with dynamic speakers? Is Janis Subwoofers still in business? Where can I find subwoofer electronic x-overs on this site? Anybody heard of MT Audio of Sweden? Please, no snide or condescending remarks about my interest in such "distortion creating devices"!. Thanks.
tomryan
HSU Electronic Crossover
http://www.hsuresearch.com
I have a barely used sub control unit from Paradigm that I amy be willing to sell. Email if you you have any interest/want more info.
I'd look into the Bryston.