HARBETH: Optimum amp for the P3ESR?

I am looking for an amp synergy with Harbeths.  With one qualification. I was looking for an amp with a high-pass filter of some kind with use of a sub-woofer as to open the mid-range of the harbeth's a little and to extend the bass and improve impact. Most of the amps suggested for the Harbeth sound are very minimalistic. (certainly the lfd which is my number one choice). How could I use a subwoofer in such a setup as described to open the midrange? The one option I have found is the Naim Uniti but alas it is out of my price range and they hardly ever come up used on here.

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