speakers buzzing or humming

[70montecarlo 10+ year member]

My pioneer 6X8's were pulsing and had no sound after i recently amped them to a rockford 150X2 amp. My head unit is a Pioneer premier deh-p55omp. I adjusted the crossover to hp and turned the gain up and now some sound comes out but it's mostly overtaken by a loud hum or buzz, what now?

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