3 12s to One 15?

[TrapPhantom 10+ year member]

Hey guys I' am currently selling my current system and planning on buy 3 AQ HDC3 12's and trying to put it in atleast a 7.0 cube box with 38-40 tuned. I currently have a DD 9515 in a 4.0 box with 40hz tuning and was wondering how big of a difference would I see? Im running the DD of the AQ 2200 and its pretty loud but I want it to be louder because I have gotten used to it. So I'm thinking about running the three 12's of the new AQ 3500...Give me some suggestion.

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[TrapPhantom 10+ year member]

and if i got 3 d2s what load could i run my amp at im trying to look it up but my computers slow

im guessing it would be a 1.34 load or 3 load correct?