I stand corrected. I've never owned a A,B,C,or D series solo. Just a GEN1 S12L7 D4, And for the amps, the ZR series amps are a weeeeebit under rated. I had a ZR240, the birth sheet stated 370w x 1 @ 4 ohms,and benched just over 450 X1 @ 2 ohms. when it's rated at 240 @ 4 ohms and 300 @2 ohms. That's a 50% increase. Look for a 360 to do about 550-600 wrms.