This is a Pyramid 312SX 3.5" speaker in the housing. I bought an extra pair so I could fit two speakers in each bracket, wired in series. However, I found out the separate radio in the rear wanted only 4 Ohm speakers, and wiring in series would double to 8 Ohm, so leaving one side blank for now. If I ever get ambitious, I could route additional wires from the radio from the unused RR and LR channels. Doubt that will happen.
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