I shouldn't have said amp,but the subs are in a 4th order box and if i disconnect 1 your can hear the difference between the two i just got the subs and the amp put new wires and a matrix linedriver the only thing is old is my alpine radio with the imprint eq/crossover i,m running a odyssey battery under the hood and a kennit 1400 in the trunk,big 3 three upgrade and a alternator from power max usa im lost don't know what else to do