1.5k rms sounds about right for me. Thats what I run to the sub. Of course I also have 600rms to my componets up front and 6.5s in the back. To get a serious response you need to give us more details about what you have and want to do. Some subs crave more power some cant handle as much. also you have to take into account what type of sub box you want sealed/ported.
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