Sundown X12/X15 - Advantages and Box requirements??

[Syphlyn]

Hey guys I have a Sundown SAZ-2000D.

I still need to measure my available space in my truck but I'm wondering what specs X12/X15 require. Below are just my guesses as I can't find any "official figures". Also what are the advantages of going for a 15 over 12 and vice versa?

For the X12 on 2k.

Volume: 2.2-2.5

Tuning: 30hz

Port area/cubic foot: 14-16?

For the X15 on 2k.

Volume: ?

Tuning: 30hz

Port area/cubic foot: ?

At least in my vehicle the sub and port will BOTH be firing upwards.

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[LosIsATool 5,000+ posts]

The 15 should be like most 15s. 3.5-5 cubes.