Ok scenario 2, new offer, better deal?

Question

my friend is gonna buy the other 650$ offer i posted and hes gonna sell me his

hes got 12 inch JBL sub in a JBL fiberglass box with a 300 watt amp plus wiring plus installation and a capacitator for 400$

Answer 1

do some research. find out all the model #'s and find the cheapest price of all those items online. figure instalation cost. if its around the same price then its not much of a deal,if its significantly cheaper then you got a deal. you make the call.also hear it first make sure you like the way it sounds