Polk SRT subwoofer keeps blowing fuses!!!

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I thought I had a bad amplifier, it ended up being there was no fuse, I put one in turned it on with the switch in the off position, it powered on, green light, when I turned the amp on the fuse blew immediately, any thoughts on troubleshooting, would appreciate the input, would love to have all 4 subs going, so I can finally hear it at 100% thanks 🙏🏻

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