I know you already bought the amp, and I have never used the MB Quartz. But I have used Massive amps on some pretty large setups and they did great. I found a Massic N4, open box special on there for 269. I believe it was the same you paid for the MB, and just judging off of price, the Massive is 300 dollars more than the MB, retail. Looks like the specs match up the same. Maybe someone else can put in some input with the two compared. But you might be able to swap your order real quick.