AK,
I happen to own a pair of Thiel 22's mated with a REL Stadium III. I've had the Thiels for the last eight years and the REL for almost a year. To my surprise, I'm crossing over the REL at 23hz. I would have never thought that my crossover point would have been so low. Looking back, I see many subs don't cross over lower than 30hz. I would make sure that whatever crossover network you get manages a cross over point below 25hz. Good Luck in your search.
I happen to own a pair of Thiel 22's mated with a REL Stadium III. I've had the Thiels for the last eight years and the REL for almost a year. To my surprise, I'm crossing over the REL at 23hz. I would have never thought that my crossover point would have been so low. Looking back, I see many subs don't cross over lower than 30hz. I would make sure that whatever crossover network you get manages a cross over point below 25hz. Good Luck in your search.