Looking for bass in a tight space?

Thew XL-12T does really well in my wifee's truck. she has 3 of them under the seat of a 2014 Supercrew in a 2.78 cubic foot sealed box. Looks great I might add, I did lighting keyed to interior dome and parking lights. Driving them on a ACS-1000D but soon will be adding a XMA-2000D to the mix. This system has a set of components up front on a 2 channel as well. Music is mostly rock, chill and House. But occasionally pipe hittin' rap too.