KAC-X810D, eh? eXcelon gear - my fave //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif
That amp will do a rated 1000 watts if you drop a 1 Ohm load on it, allegedly. Sadly I must also say that I have heard numerous reports that no matter what Kenwood says that it doesn't like a 1 Ohm load even though it is rated to be stable that low.
You'll get 800w + out of it @ 2 Ohms, however, so look for a pair of subs that will be happy with 400~450 apiece going to 'em in either a Dual 2 Ohm voice coil configuration so you can run them together @ 2 Ohms or either a single 4 Ohm coil (for the same reason - running them together at 2 Ohms)
Edit: Nevermind - you already have the subs - what VC configuration are those Type Rs?