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When I had subs that only had low pass filtering, I used the NHT X2. IIRC, when I was researching this a few years ago, this seemed a much better option than the RCA high pass filters that are sold. At present, I think that there may be DSP solutions like the AntiMode (?) that could provide the X2's functionality as well as DSP possibilities that could help minimize room nodes.
The mains sound much better high-passed. The fact that it makes them easier to drive is an added bonus. Even better is the overall sub/main integration. Jim