pdx-m12

I'm currently powering my Ultimo SC 12(600W Power Handling) with PDX M6(600W), and kinda satisfied with the setup... Today I found a guy in my area selling a BNIB PDX M12(1200W) very cheap......about 320 USD....and I feel like I'm tempted.. Would a PDX M12 hurt my Ultimo SC 12?:D Wondering if...