Alpine PDX-5 under-rated power?

[Nicky Pass 10+ year member]

I'm starting to buy the stuff for my system and I decided to do a 5 channel all in one amp. I decided to go with the PDX-5 from alpine because of its size and power output. I have already bought Hertz HSK 165s and I just picked up the amp from my local place. I opened the box up to see what it was all about and I didn't know that the amp would come with a "birth" card. To my suprise, its rated at 75x4 and 300x1, but the card said the actual output was 124x4 and 406x1. Now all I have to do is figure out the sub setup for a supercab F150.

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