High quality high pass filtering for speakers?


Is there a good option for high-passing the speaker connection in a high-end system? 

I want this for a few reasons.
1. NO loudspeakers will come close to a really good standalone sub. Even $20k + speakers end up with really bad distortion at 50hz.
2. My sub has 3 parametric EQs, which helps tremendously in dealing with a 12db spike I have around 60hz. It's no help at all if the speakers are playing that frequency.
3. Even with 2-way speakers, there is still a lot of overlap between sub and speakers without a high pass. Not ideal.
sboje
Vandersteen Quatro are way under $20k and have a fantastic built in powered sub with 11 bands of analog EQ
and are phase and time correct with pistonic drivers
a pair of 5a ( no longer in production ) with push pull aluminum cone subs are around used for $8-10k
the 5a carbon is still in production
all the bass amplified vandersteen products come with very carefully engineered hi pass filters and correction for the built in sub amp

i am biased


I use the JL Audio CR-1 with two JL Audio Fathom f100v2 subs and ATC SCM50 active speakers. After both bass trap and other passive acoustic treatment and digital correction from subs, I can't imagine anything sounding better with incredible seamless integration of subs and speakers.