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In a 1990 LX it is under the passenger seat.
Under passanger's seat. It is a black box with two plugs on opposite sides.
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The amp should be inside the rear quarter interior panel on the passanger's side. That's if you have the Premium sound factory system installed on the car.
The 1995 ford Aerostar did not come stock with a factory amp. If your van has an amp then it was added aftermarket.
Take the rcas from the amp and connect it to the + and - posts on one of your speakers.
It's inside to rear compartment right above the subwoofer.
A passive subwoofer doesn't have a built-in amp and will require the use of an amp.
You will have to buy a pig tail at an audio store for the factory amp under neath the passanger side seat.
it built into stereo