I will suggest the used one~
Also when you buy the 1.8, you can ask the seller for the ecu, they always give it for free. Or you can say "it should be a set"~
ya~ I used a 110V power adapter, and line in from my CD Player.
Sounds better than a lot people's 12'' which in the trunk ~
The bass very clean and clear.
I has a aony subwoofer which can put it under the passenger seat in a 98 Protege~
It sounds very good~ but someone broke my window and thieved it..... sad..