I have 2 mtx thunder 7801d amps and was wondering if that is enough power for 1 of the Bl 18's? If yes what options should I choose for the Sub? I know I'm going to need the daily option for sure, but after that I'm lost.

I would get a BTL with dual 1 ohm coils.

Ohm: Dual 1

P Chamfer: no

Cooling: yes

3rdMagnet: yes

HiXmCoil: yes

Daily or SPL: Daily

Universal: yes

You have 2400+ watts with those two amps. I would get a BTL over a BL with that much power.

Brian

like brian said the btl will handle that power nicer, pushing 2400 to a bl is a little pushy

I would get a BTL with dual 1 ohm coils.

Ohm: Dual 1

P Chamfer: no

Cooling: yes

3rdMagnet: yes

HiXmCoil: yes

Daily or SPL: Daily

Universal: yes

You have 2400+ watts with those two amps. I would get a BTL over a BL with that much power.

Brian

Why not the Dual 2?

The TA7801 makes max power at 1 ohm. Buy a dual 1 ohm sub and connect one amp to each voice coil.

Brian