It's been a few years since I've had a real system in my ride but before kids and stuff my sub of choice was Rockford Fosgate and an Alpine head unit. When I had my '04 Blazer Xtreme the only audio I upgraded to that was a Bazooka sub (Triangle looking sub) in the rear. It put out good base hitting off that back hatch glass for not being real big. When turned up you could hear it a couple blocks away.
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