This is exactly what you want:
You will wire RG-6 coax from the receiver location to the sub location and terminate the RG-6 with normal F-connectors. Then screw in that bad-boy above which you put into a standard 1-gang wall plate, and you are good to go.
DO NOT FORGET THAT YOU NEED POWER NEXT TO YOUR SUB!
A great device is from Panamax (I think) that allows for you to put an outlet where you want it, then wire it back to your receiver & surge protector main location. It gets everything on the same circuit and protection to help eliminate ground loops, noise, and surge issues.
WIRE THE HECK OUT OF YOUR HOME - It is 3 to 5 times as expensive to add wire after walls are up. I spent about $3,000.00 wiring my home. A deal in my opinion. Lots of conduit, cable, lan, phone... did I mention conduit? Plus security and lots of speakers.