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Message: <blockquote data-quote="Doxquzme" data-source="post: 8877683" data-attributes="member: 689267">That's a theoretical draw, not going to be the case in music playback. Potential and realized are way different. Music is dynamic and even with a 4500 watt system, played loudly, I've never clamped more than about 50-60 amp peak so assuming they are playing music 99% of the time, they'll never see anything near 120 amp draw. My guess is more like 10-15 amps when blaring it.Even if that were the case, a HO alternator is almost always the last thing needed in todays systems where ample support from a 2nd battery or a small lithium bank will suffice. I cannot think of anyone's 1200 watt system that would actually need an HO alternator or a 2nd battery.</blockquote>

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