Magnepan 3.7 speakers + Audio Research Ref 75 amp

Magnepan speakers have an average impedance of ~4 ohms and generally need LOTS of power. Tube amps rated at under 100 watts need not apply. So I'm told. I've also heard that Magnepan and ARC have a synergy that may be hard to beat, though I can not say I have ever listened to this combo.

So, my question is, would a 75 amp from ARC (with a power supply storage of 520 joules) be sufficient for the 3.7 Maggies in an 18' by 30' room? Has anyone heard or heard of this combo before?

Thanks in advance!