I have an ns-1 which is 6500 watts rms on my 12" zv4's. They're taking that amp pretty well which is way above what the subs are rated at. But I also put another amp which did a little over 2000 watts which was under powering the subs and they we're still insanely loud off that power. So my point is you'll be fine and it should get plenty loud giving them rated power. You'll be happy with those x's with a good efficient enclosure.
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