NAD rates their amps very conservatively, they always have. This is probably why it didn’t catch on fire, just kidding (I think). I suspect if you had a Yamaha or Sony receiver we would be having a different conversation right now.
Like others here have said, I would at least get a 3 channel 4 ohm stable power amp for the front rating minimum 200 wps into 4 ohms. That should give you lots of head room for those times you really want to make those Axioms sing and not have to worry about speaker damage. I would recommend an amp that has a toroidal power supply for added stability.
To keep the price down you might want to look at some professional amps. I use an AudioTrak 6 channel 4 ohm stable pro amp rated at 300 plus wps. In my 4000 cubic foot room, my hearing will go before I damage any speakers. I don’t get any amp clipping even at 105 db at my seating position. (BTW, 105 db is damn loud!)
http://www.audiotrak.com/pdfs/AT-6100-Amp.pdfWonderful room buy the way!!!!!
