Not sure about the speakers in the rear door, but the subwoofer in the right rear of the cargo compartment is a single unit. We had a hardware store load a gas grill in the Terrain last weekend and they put a hole in the grill. The dealer said the grill is part of the speaker and have to replace the whole unit for $350....bummer. At least the store said they'd pay for it, but I don't think they were expecting that much. I hope they do pay.
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