Well right or wrong I just bought a Kicker ZX300.1 (NIB) for $90 (about $70 USD).
It's 300w into 2-ohm or 150w into 4-ohm and at this point is returnable.

I am planning to power an MTX FMUSTO5D12-T45 ThunderForm w/12" woofer and hook up to my Shaker500.

Does anyone know if the ThunderForm 4500 in the FMUST05D12-T45 is a single 4-ohm or dual?
If it's single then should I consider replacing it with a dual 4-ohm voice coil subwoofer?
Rockford Fosgate Punch STAGE 2-P2D412?
KICKER CompVR 07CVR124?

???

Thanks!