I have a Nord it has 3 separate amps, 3 separate power supplies, 1200/700 (?) they were the same as their One Up MB with rev D. buffer boards and Sparco 2590 Opamps with Sparco voltage regulators.. SERIOUS amp it will match your Mac SS no problem
NC500s, 500/700/550, 8/4/2 ohms, I'm close..
It has a 12 volt trigger I had added just for this.. It has 50 hours on it. I went another direction.. It's actually 3 amps with 3 PS.. ONE Power Cord.. I have two good PC cables to pick from.. PM me.. AG can use the business..
They are 2 ohm stable, even 1 ohm, for short durations.. They are actually brand new, perfect factory as delivered to me. Setting in a Nord BOX...
BTW I been using Mac gear for 50 years this summer.. I use a C2500, MX120 and a C20, all 3 make the Nords sound fine. I use small planar line line arrays..