Need Help With Subwoofer Choice In Scion Xb

[FlySocietyJones 0]

Hi I'm relatively new too the car audio world and I have been patrolling this forum for some time now trying too gain more knowledge. Basically I'm stuck trying too decide on what subwoofer I'm going too choose based off space in my car.

It's A 2008 Scion Xb I Wanna Keep The Rear Seats Dimensions Are 38x38x16 Im Not Bias On Any Brands And Open Too Any Sizes Just Wanna Get As Loud As Possible And As Low As Possible. I Already Have Mechman Alt Installed 0 Gauge Ran Big 3 Done And Yellow Top Under The Hood And A Hifonics BRZ2400. Budget Is About $1,000 For Subs. Thanks For The Help