Resonant Engineering is a Sub brand, HC is their model, JBL 1200.1 is an amp, 1200 watts at 2 or 1 ohm, made by JBL.
Buy Resonant engineering (RE) from their site
http://www.respl.com
But call them, their listed prices are way higher then what they charge.
Buy JBL amp from almost anywhere,
ebay for best buys though.
I would suggest elemental designs K series subs, they are a small box woofer and they get great sound and the 15's are 145 a piece. Very nice sub for the money.
http://www.edesignaudio.com