i doubt it if the amp is an original alpine amplifier because original alpine amplifiers usually have a model number with a "F" in it and not a "T" if its a 4 channel amp.
anyways anil is totally right to tell u to demand a lesser price for ur rear speakers because i myself installed the newer 5 way pioneer speakers TS-A6992 (i guess thats the model number) which have a wattage of 460 watts for 3500 some time back