I need some serious powering help

[Alpine Audio]

So my total system output will line up around 1500w RMS. My car is a 1988 Honda Accord 4-door. Yea its old. I know I need a larger alternator but have found out they only make a 60amp alternator which is too small. What can I do without making a smaller set-up. I heard you can add on another alternator with an extension and a larger belt. Any other suggestions without adding anothe alternator?

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[synikalt 10+ year member]

big3+extra batter