A thought. Why not super-insulate the top of the attic against the roof with 20-30 inches of fiberglass insulation or 12 inches of foam and leave the space around the mouths of the horns open to allow circulation of air around the horns. Would probably cut your energy bill and at the same time keep the drivers at room temperature. Othwerwise they'll be very cold in the winter and hot in the summer.
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