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On my 2004, the rears are 3" 6 Ohm HAES speakers. they are wired in series so thus I think they sum to 12 ohms on each side. If you replace each of them with 3.5" 4 Ohm speakers, you should get MUCH better sound/volume without having to modify the pre-amp.
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Current: 2004 Boxster S 550 Spyder Anniversary Edition (BSSE)
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