okay i have 4 10s in a sealed box they are jl i am bias to them so do not tell me any other. my amps are 2 1000d memphis. i have a cousin who has 4 12 jl audio in a ported box with a memphis 1000d reference. i want to know can 10 hit harder than a 12. i know a 12 plays lower notes. i just want my system to hit harder than his which i think it does anyway. if anybody has any suggestions on what to do i would appreciate it. also could someone explain the difference between the studio class d memphis 1000d and the reference 1kd thanks.