[DManzaluni]

I have a car with an 8 or 10 speaker setup. It seems to have had an
Alpine head unit original with eight speaker outputs (I dont know
which model)

Someone has replaced the head unit and put a gigantic Diamond Audio
amp in the trunk which seems to feed into as many as two squakers, one
in each door.

Is there anything I can do to try to ameliorate this and get the two
channel amp to power all speakers at once please? Is there such a
thing as an 8 speaker cross-over out there which i can install between
the amp and the speakers?