@Knghifi the mac has been a surprisingly good performer with regards to dynamic drive, as I indicated above the bass is less clean tight and punchy than a solid state amp i recently auditioned but overall I feel that adds to the authenticity.
I remember back when I had my Dynaudio 3.4 and a Krell 2250 amplifier @ 250/8, 500/4oOhms, I replaced the Krell with the Mac and I really wasn't missing anything in the drive department while gaining so much in the midrange and realism.
I think the JJ Tesla tubes help as well, not as neutral as the stock tubes but surprisingly authoritative in the bass.