2 Sundown X-12's in a series 6th order bandpass tuned super low for the back of a large SUV.

2 Adire KH3001's (3000w 15's) in a 4th order bandpass for the back of a large SUV.

2 Massive Audio Hippo 15's ported and flared going in the back of a large SUV.

Single Sundown Sa-12 Classic ported going in the back of a small hatchback.