Amp for Harbeth 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.

Sam
samlucas091
Sam, why do you think using a sub is going to open the midrange? (whatever that means) It's fine already. Perhaps you're needing a source or gear change?
As far as the amplifier and cd player are concerned, the Uniti essentially combines the Nait 5i and CD5i. It has other functions of course, but that's the core.
Well, having heard the phenomenon a few times before with monitor audio, phase audio, and (especially a dramatic difference with) B&W. Taking the bass load off the mid-range cone on small bookshelf speakers opens the mid-range and adds sound-stage and airiness in there. And I get the bonus of plenty punchy, textured, and tuneful bass. :)

I hear Naim gear is a good match for Harbeth gear. I certainly like PRaT and dynamics as well as musical yet uncolored sound. But I need a chance to hear Naim gear hooked up to my Harbeth P3s.

I was looking for other brands that have synergy with Harbeth and have an easy way to setup a high-pass and sub-woofer.
Unless there is something I am not understanding about sub-woofer set up?

Thanks,
Sam

PS. I am not driving my Harbeth P3ESRs with anything right now. They are fresh from the dealership in South Florida.
Either a Naim Nait XS or the new, soon to appear, Naim UnitiQute would be a good match for less money than the Uniti.

The Qute is basically a Uniti without a CD player and a little less power.