4x 15" subs in 09 Chevy Tahoe

[GoT_2B_BuMPiN]

Hey all...I am looking to plan my next build for my 2009 Chevy Tahoe SSV. I have no 3rd row seats. I currently have 2x Sundown Audio Ev3 15" Subs with Sundown SFB2000.1 @ 1ohm. I built the box, which is slot port and tuned to 32Hz.
I am looking to sell current setup and start fresh. I want 4x 15" subs. Any recommendations on what to go with?

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[Boominburban]

DC xl's work great in less airspace then most subs. They might be a good option for you.

 

[Bobbytwonames 5,000+ posts]

What is your electrical setup? What is your budget?

 

[audiobaun 5,000+ posts]

I would add two more of the same subs and look at selling the 2k to go towards the funds of a decent 5-8k mono amplifier and new enclosure