My audio system runs off a 16A fuse. That would, in theory, be up to 192 watts. So allowing headroom, no more than 100 watts. I have only two speakers (the S version for poor people), so a max of 50 watts. It is never played at full lick, so assuming heavy bass, no more than 40 watts. My sidelights use more than that! hardly a heavy load on the alternator.
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