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Double Bass Notch Filters?

I'm trying to fight back GAS pains for a series 3 Acoustic Image. The one feature that I really miss with my series 1 Clarus is the notch/low pass filter. Can any one recommend a good outboard box that might fill this need and keep me dropping a bunch of money on a new head?
I've looked at the specs for the D-Tar Equinox and it seems like it might be a bit of over kill, both in terms of features and size. What else is out there?
Thanks,
John