This is a tough review to make.
First of all, I need to mention two things. One I have bought some 10 inch Planet Audios for cheap on Amazon and I love them. I really do. They are in my car and have a nice amp on them and they work amazing.

2nd, I did not buy these for a car, but to replace some PA speakers that blew. The price was great and I was hoping since these are dual voice, I could wire them to 8 ohm, which did work. I put a decent crossover in the box, but I was not really happy with the result. I did buy a much more expensive crossover and try it again, but was still not happy. That being said, these really are just meant for bass, nothing else. Meaning, they will not work well in a 2-way crossover over experience. you will need some full range speakers or a 3 way system.

I am putting more details below.

Pros:
Prime shipping (Amazing Prime rocks).
Great Price
Low Base
Nice packaging.
Visually, VERY nice looking speaker (really nice actually – both front and backside).
Heavy, Heavy magnet
Dual Voice Coils (can wire them 8 ohm, 4 ohm or 2 ohm).
Can handle (it says) a lot of power.
Amazon took car of my return concerns

Cons:
No mids, just bass. I mean, NONE. You still need a crossover, but still none.
They really suck power. You need a lot of power – without a lot power, they are not very loud.
You might really need to spend some time tweaking you sound out to make these work.
does not tell me the voice coil size (I am just curious)
flat sound (without mids, it is not very warm sounding).

This is not a pro or con.
I did learn, PA speakers, have flat stops (no bubble on the foam on outside of speaker). These were HUGE….