OK just got one of these in it was a refurb off ebay. It was DOA. It had a bunch of mixed parts And regulators. I got the power supply running. It the same board as the hifonics 1600.it uses all 640's in the output section. The issue is half of the put section will send the amp into protection. Even with a good output driver card... All the gate resistors are good as well. What could cause this problem?. Thanks!
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