i think it plugs in. not sure though. but i answered my own question. no you cant hook two of the amp/subs up. it would change the impedance to half the normal ohm load. so never mind guess i will settle for stock or go aftermarket later.
So as long as you have the subaru harness for your aftermarket HU then you can use the factory sub? i been thinking about getting the sub but thought you needed the factory HU. in directions it shows the stock HU having a seperate connection in back for the sub/amp connector.. is there a 3-way plug i am overlooking?
if anyone could clear this up i'd appreciate it..thanks