Well I will continue the relation in which no one is talking about clarion subs and point out that if you have rear 6x9's then you have no front stage to speak of //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif You have a deck, amp and 4. Good for ghetto blasting any radio station or cd.
Again, If you want to give them a try, get them. Like them, keep them. Hate them, sell them if you are unhappy with your current sub.
Also what the hell is an MRF 200? Sure your not talking about an MRP200?