I got a Hivi M6N for Christmas. After much searching on the forum I found a crossover for a project using the M6N and a Hivi SD1.1 tweeter. They carry the tweeter at Madisound. It was done by Dave Thomas in January 2013. He is not active on the forum now. If you want to send me your email address I will send you what I have. I could not send it thru this messaging program.