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Need more specifics. Need to know the model number of the sub or at very least make/model/size OR rms output and what resistance.

To sort of answer your question, I'm assuming that's 400w peak power. That's probably 100w RMS at 4 ohms. In which case, pretty much any amp you find will max that sub out.

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Q: What's the lowest watt car amplifier you can use with a VR3 400 watt car subwoofer?
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