Guy i work with has amp already, hifonics bxi2608d, the amp is rated at 2600x1@ 1 ohm. I dont think it does that much but he wants to run 1 12" or 1 15". Out of FI BTL, sundown Z-15, nightshade, or death penalty, which would work better with that power, ported, cant use no more than 5 cubes.

The BTL would be fine with the "power" and the box requirement.

The Z-15 is rated at 1000w. So unless you're planning on 2 12" in one box don't choose them.

You'd be close to the thermal limits of the Death Penalty. It'd be ok if you're careful on the gain knob though.

The Nightshade would be ok with the extra cooling option now. They like smaller boxes though, so you don't need to use the full amount.

thats what i told him to go with, i love my bl's

should also look into an omega.

cascade-designs.com