My first 'system' was a single home cabinet speaker with a Pioneer 15" sub in it, run off ONE rear channel of a Pioneer headunit. It sat in my backseat playing full-range off 7watts RMS for about a year or so in a 1981 200sx. I would have had two of them, but the other 15 had a broken tinsel lead that a local electronics shop told me couldn't be repaired. I really wished I had had both of them to put in my backseat.
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Do I win???