If the answer is tone controls or equaliser, may i suggest that you are asking the wrong question?
I second caphill's opinion re the Mac preamp.
It really has no place in a system of this calibre.
Philosophically your system seems stuck in the 70's. If you can't change your room, change your speakers, add subwoofers....anything but tone controls. A switch to an ARC Reference preamp will increase bass extension, control, tonality, PRaT, everything really.
Quite often in audio there is no clearly better option, just differing interpretations, but this is not one of those instances; if you take caphill's advice you stand on the threshold of a giant step forwads
I second caphill's opinion re the Mac preamp.
It really has no place in a system of this calibre.
Philosophically your system seems stuck in the 70's. If you can't change your room, change your speakers, add subwoofers....anything but tone controls. A switch to an ARC Reference preamp will increase bass extension, control, tonality, PRaT, everything really.
Quite often in audio there is no clearly better option, just differing interpretations, but this is not one of those instances; if you take caphill's advice you stand on the threshold of a giant step forwads