Subwoofer and Amp mount ideas?

[ticopowell]

It is a mono amp, an orion cobalt 800.1, so 800 watts max, 400 watts rms, the sub is a memphis 12" shallowmount 500 watt rms 1000 watt peak, it also is a dual voice coil, but im not sure if its a dual 4ohm or a dual 2 ohm, i know both exist with this sub. the amp has 2 speaker outputs even though it is a mono, and the sub is hooked up with the positive wire in the output for 1, and the negative in the output in the other. I hooked it all up just like the place that first put it in did, so IDK if that is bridged, or how the sub is exactly wired. I want to say that the sub is a dual 4 ohm wired in parallel so the amp sees 2 ohms.
let me know if this helps, im still fairly new at this whole car audio stuff, but i researched a lot before I put this system in, but i still dont know too much haha Thanks for the help.