Re: what tuning? what amp? how big?
If you're after good low end extension you'll need to build the box larger than the manufacturer suggests. Their recommendations are normally for tuning at ~35Hz, which is best for all around performance and SPL, not low bass response. Of course, that sub will get low tuned at the mid 30s but it will fall off more quickly and at ~30Hz, which kind of kills the lows. I haven't modeled that sub but I would guess that 4.5-5 cubes at 30 Hz would be a good box for low end extension while still having decent sound pressure. If you're looking for low end extension in a small box, look for a sub with a high EBP. That sub's EBP is ~66 and for what you're after, an EBP above 80 would be much better. You can find EBP by dividing Fs by Qes.
As for amps, the CT Sounds 1400.1 is a great match for that power handling at 1Ω but I wouldn't be scared to run that sub on double rated power, in which case the 2200.1 would be a good choice.
As for power upgrades, you should do a big three upgrade and you should have at least 100AH of battery. I would suggest a 100AH second battery, all wiring in zero gauge and a 200 amp HO alternator. Although, a factory 140 amp alternator would be okay but not ideal.
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