Anyone have any experience with sundown Sd4 series?

[Jln213]

I have a Sd4 12 that I am thinking about building a small box into the rear quarter panel of my land cruiser for. But I think my box may end up on the small size. I also will be powering it by an old school Phoenix gold zx500. All of my equipment is old school aside from the sundown. I do have some other more powerful amps. But I have matching pg amps powering everything else. 

Thanks

Jeff

[12V71]

I have a friend that has that sub in a 1 cuft box under his rear seat and it sounds real good. That old gold will do 500 watts