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What headunit are you using? If you adjust the volume of the headunit, does the buzzing get louder or quieter? If you adjust the amplifier gain, does the buzzing get louder/quieter? Another thing you can try is take a spare set of rca cables. Cut the ends off. Short the two leads together. Hook up the shorted plugs to the INPUT of the AMP and see if the noise goes away. DO NOT HOOK THE SHORTED PLUGS TO THE OUTPUT OF YOUR HEADUNIT.
DON'T get an unfused distribution block on the power side. You can very feasibly have an issue with a single amplifier that will fry the amp, but not blow the fuse under the hood. The fuses in the distribution block are to protect the amplifiers. The fuse under the hood is to protect your car/power wire from a failure upstream of the smaller fuses.
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