You don’t have a sub woofer unless a previous owner installed it. I can’t tell you what speakers you have but they probably aren’t great. Then too, neither is the radio. If you are an audiophile you’ll probably want to start over. Fortunately, it’s pretty easy because the vehicle is so big that everything is easy to access. I don’t have your model but if it’s already wired for satellite radio you’ll see the little antenna on the roof and the wire will be attached to the back of the radio. It just means you need to activate the subscription you want it. You also will know is you switch the radio to satellite and you see preview or enrollment information.
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