i have a kicker crv 12 inch sub thats not working right,can you help?

i had a 10inch sub in my trunk that blew.so i took out the speaker and put in a 12 inch crv kicker in the same box.but its not giving the kick that it should.i am using the same amp(which is 300 watts).is that enough wattage?or do i need to get a bigger amp?also i do have another amp that is 300 watts.can i use 2 amps to run the sub?if so how do i hook both up?there are 2 places on the sub speaker to hook up wires.
as for putting the 12 inch in a 10 inch hole,all i did was make the hole bigger and the subwoofer fit perfect.
 
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