Alpine sound system 4 om or 8 om?
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Car speakers are pretty much all 4 ohm. Start there. As for power, you are going to need speakers capable of 25W RMS/50W peak at a minimum. Sensitivity is based on parameters that you can't really control. Granted, if you are stuck between 2 speakers, then let the deciding factor be the one with the higher sensitivity (sensitivity is simply a measure of how much sound the speaker produces for a given amount of power in, so a speaker with a higher senstivity will be more efficient and produce more sound for a given amount of power applied).
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stanislav (11-27-2016)