Question about options on amp...

[CentralFC 10+ year member]

So I recently purchased an Alpine MRP M500 amp and I'm wondering about one of the settings on the back. There's minimal, nominal, 2, 6, and 12 hz. I could be wrong about the numbers, but what does it mean exactly? The sub pushes 500 watts at 2 ohms, which is what I wired it to, but how high up can I have that setting and allow it to play safely without it blowing?

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