Help with amp settings

Hey y'all, I recently got a 12" Alpine Type-R SWR-1223D and an Alpine MRP-M450 amp. My deck is a Kenwood KDC-MP735U. The manufacturr recommendations for the sub in a sealed enclosure is 14.4.5"x10.5" or 0.90 gross volume and 0.75 net. The box I put it in is 17"x17x11.5". The box also has a 1" slant on both sides so the bottom is 11.5" whereas the top is 9.5" for a gross volume of 1.7 and net volume of 1.25 if I'm not mistaken.
The trouble im having is where to set all my levels as I'm somewhat of a novice and honestly I'm afraid to mess with amp settings cause i love that alpine.

Can any of y'all recommend a good setup with the nobs.

Gain.. Where should I set this?

Bass EQ... 0dB, 6dB or +12dB?

Crossover frequency... Anywhere between 50 and 200Hz.

I have my Type-R set at 2ohms.

In case it matters, this is how i have my Kenwood set:

Bass: -8

Treb: +8

Mids: +6

Sub output: 0

Bal: 0

Fade: 0

Any help would be most appreciated.

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I'm sure you meant 2ohms and not 4ohms. Amp cant do 1ohm, but i have the sub itself wired at 2ohms now. So I'm not stuck at 4ohms. ☺
And at 2ohms, it does more than 225rms.

Thanks anyway though I suppose.

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My Type-R has 4 inputs in back. 2+ and 2- which in turn means it can be wired at 2ohm at the sub itself.

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Wrong that I have 2+ and 2- on the sub? Obviously if I was an expert, I wouldn't post here only to have you say my type r cant run at 2ohm even though I followed a diagram in the owners manual for 2ohm.

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Dude if you have a dual 2 it can got 1 or 4. That's how it works. If you have a dual 4 it can go 2

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